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These and hundreds of others Colin learned to know from the collections. It was with great delight that Colin heard of the presence of his friend Mr. Collier, who was working on the plans for a model of Bryozoa, and who had with him his staff of glass-workers and modelers.
Clark, one of my assistants, has made very good drawings of all its stages of growth, and of various other hydroid medusae peculiar to this coast. Mr. Stimpson, another very promising young naturalist, who has been connected with me for some time in the same capacity, draws the crustacea and bryozoa, of which there are also a good many new ones here.
We find the vascular system in this very simple form to-day in the Bryozoa, Rotatoria, Nematoda, and other lower Vermalia. The first step in the improvement of this primitive vascular system is the formation of larger canals or blood-conducting tubes. The spaces filled with blood, the relics of the primary body-cavity, receive a special wall.
In its most calcareous form the Mountain Limestone is destitute of land- plants, and is loaded with marine remains the greater part, indeed, of the rock being made up bodily of crinoids, corals, and bryozoa with interspersed mollusca. Palaeozoic type of lamelliferous cup-shaped Coral. Order ZOANTHARIA RUGOSA, Milne Edwards and Jules Haime. a.
Section at Bradford of Great Oolite and overlying clay, containing the fossil encrinites. Three perfect individuals of Apiocrinites, represented as they grew on the surface of the Great Oolite. d. Body of the Apiocrinites rotundus. Apiocrinus. a. Single plate of body of Apiocrinus, overgrown with serpulae and bryozoa. Natural size. Bradford Clay. b.
At some places in the neighbourhood the softer mass is divided by thin flags of hard limestone, and bryozoa placed in the upright position in which they grew. From the abundance of these coralloid mollusca the lowest or White Crag obtained its popular name, but true corals, as now defined, or zoantharia, are very rare in this formation.
Pelvis or body; called also calyx or cup. c. Of the Bryozoa, the prevailing forms are Fenestella, Hemitrypa, and Polypora, and these often form considerable beds. Their net-like fronds are easily recognised. Palaechinus gigas, M'Coy. Reduced one-third. Mountain Limestone.
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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