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The outer antennae exhibit a well-developed and sometimes distinctly articulated scale, and within this usually a spiniform process; the flagellum appears generally to be still wanting. The third pair of maxillipedes seems to be always present, at least in the form of considerable rudiments. The spatuliform caudal lamina bears from five to six pairs of setae on its hinder margin.
"O Carlyle, the merit of glass is not to be seen, but to be seen through; but every crystal and lamina of the Carlyle glass is visible." Of course Carlyle might reply that stained glass has other merits than transparency, or he might ask: Why should an author's style be compared to glass anyhow, since it is impossible to dissociate it from the matter of his discourse?
Being almost completely encased by a somewhat inexpansible and insensitive wall and sole, renders the foot subject to pathologic changes peculiar to itself. The very nature of the structure of the foot together with the function of the sensitive lamina is sufficient cause for an affection unlike that seen involving other tissues laminitis.
The new one just received from Australia, which I am now about to describe, in this respect more resembles the Margarita than any before noticed; yet I am inclined to think that the pearl-shells deserved to be kept separate, as the cardinal teeth are quite obliterated in the adult shells, which is not the case with any AVICULAE I am acquainted with; and the young pearl-shells are furnished with a broad serrated distant leafy fringe, while the AVICULAE are only covered with very closely applied short concentric slightly raised minutely denticulated lamina, forming an epidermal coat on the surface.
This discovery was sufficient to ascertain the point in question: for it appeared afterwards that the Cuticle, when divided according to this discovery from the other lamina, was semi-transparent; that the cuticle of the blackest negroe was of the same transparency and colour, as that of the purest white; and hence, the true skins of both being invariably the same, that the mucosum corpus was the seat of colour.
The excavation of the disc progresses slowly and is due in part to stretching the fibers of the lamina cribrosa pressing this structure outward, and partly to atrophy and disappearance of the nerve tissue and much of the vascular tissues in the nerve head. The displacement backward of the lamina cribrosa may cause that structure to lie behind the outer surface of the sclera.
It consists generally of three branches; and these, although much elongated, evidently represent the petioles and midribs of three leaflets; for they closely resemble the same parts in an ordinary leaf, in being rectangular on the upper surface, furrowed, and edged with green. Moreover, the green edging of the tendrils of young plants sometimes expands into a narrow lamina or blade.
AVICULA LATA, pl. 6. f. 1. Shell dark brown; half ovate; broad obliquely truncated, and scarcely notched behind; covered with close regular very thin denticulated concentric lamina, forming a paler external coat. The front ear rather produced, with a distant inferior notch; internally pearly, with a broad brown margin on the lower-edge. Inhab. North and West coasts of Australia.
The cause of this is, that each of the lamina possesses a vitality of its own, the sap rising through every part of it. I had seen some trees, from which the natives had so often stripped the bark that the lower part was two or three inches in diameter less than the higher portion which they could not reach.
The middle and longest lamina in the Greenland whale is ten, twelve, or even fifteen feet in length; but in the different species of Cetaceans there are gradations in length; the middle lamina being in one species, according to Scoresby, four feet, in another three, in another eighteen inches, and in the Balaenoptera rostrata only about nine inches in length.
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