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SPATANGUS ELONGATUS, pl. 6. f. 2. Body elongate, cordate, with a deep anterior grove and notch; covered above with minute hair-like spines, with scattered very elongated tubular minutely striated spines on the sides; the anterior groves and circumference of the vent with larger equal hair-like spines on each side; the under surface with a triangular disk of similar spines beneath the vent, and with elongated larger tubular spines.
We obtained, at the same time, large pieces of Labularia digitata, Sertularia abietina, upon which nothing of the animal kind was to be seen, but attached to which was frequently found Flustra dentata; also Pagurus Bernhardus, Fusus antiquus, Rostellaria pes pelecani, Cardium echinatum, Ascidia Prunum, Balanus sulcatus, Echinus saxatilis, and Spatangus flavescens.
In a slab of sandstone, not more than an inch thick, the furrows or ridges of an ancient ripple may often be seen in several successive laminae to run towards different points of the compass. Successive Deposition indicated by Fossils. Limestones formed of Corals and Shells. Proofs of gradual Increase of Strata derived from Fossils. Serpula attached to Spatangus. Wood bored by Teredina.
There must have been an interval during which it was still surrounded with clear water, when the creatures whose remains now adhere to it grew from an embryonic to a mature state. Recent Spatangus with the spines removed from one side. b. Spine and tubercles, natural size. a.
In Echinoneus, the shell is described by M. Perrier as bearing two kinds of pedicellariae, one resembling those of Echinus, and the other those of Spatangus; and such cases are always interesting as affording the means of apparently sudden transitions, through the abortion of one of the two states of an organ. With respect to the steps by which these curious organs have been evolved, Mr.
Peter's Mount, in the suburbs of Maestricht, abounds in corals and Bryozoa, often detachable from the matrix; and these beds are succeeded by a soft yellowish limestone 50 feet thick, extensively quarried from time immemorial for building. The stone below is whiter, and contains occasional nodules of grey chert or chalcedony. Mosasaurus Camperi. Hemipneustes radiatus, Ag. Spatangus radiatus, Lam.
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