OCR Text |
Show 54 ZOOLOGICAL COLLECTIONS MADE DURING [Jan. 4, shallow pits. Mouth entire, transversely elongated, subhorizontal, the lower lip being salient but not toothed. A round avicularium below or on the edge of mouth, on a small rostrum. Ocecium elongate, with a deep broad sinus penetrating into it from the mouth. Dorsal surface minutely roughened, but shining ; the outlines of the cells marked by shallow grooves ; a small rounded avicularium on most cells. Hab. Tom Bay, S.W. Chili, 0-30 fathoms. Six broken fragments, probably all belonging to one colony, represent the species. It is distinguished from R. beaniana, King (Hincks), by the sinus (not a slit) of the ovicell, and by the inconstancy of the position of the suboral rostrum, which is most usually separated by a considerable gap from the mouth. CELLEPORA TUBIGERA, Busk. Cellepora tubigera, Busk, Crag Polyzoa (Mon. Palseont. Soc), p. 60, pi. ix. figs. 8, 10. The sinus of the mouth is sometimes small and on a level with the mouth (as in Lepralia trispinosa, Johnston, &c.) ; otherwise it forms a great vertical gap in the peristome. The rostrum is sometimes pointed and bearing an avicularium on its inner aspect (as in C. pumicosa), sometimes broad at the apex ; it is sometimes placed laterally with regard to the cell, and sometimes at some distance from it. The cells are rough or smooth, much or little punctured. The ovicells are globose, smooth, with a few slight ridges running usually across their breadth, or with a crown of punctures on the upper surface from which radiate slight ridges. There are large long avicularia between the cells, generally on special raised but flattened bosses. Two young and nine adult colonies occur in this collection, embracing Sertularian and Tubularian stems, exactly after the manner of C. pumicosa. Hab. Trinidad Channel (off Madre-de-Dios Islands), S.W. Chili. One group, consisting of one young and two adult colonies, from 30 fathoms ; for the rest the depth is not known. All on Sertularian stems, with one doubtful exception. CELLEPORA BILABIATA, Busk. Cellepora bilabiata, Busk, Voy. of Rattlesnake, p. 382. Two colonies, one forming almost a perfect hemisphere, the other flattened, uneven. Both lips of the elevated peristome sometimes bear avicularia. From the " scutiform area " (which is really formed, as shown by varieties, from a sinus which once extended into it from the mouth) of the small ovicell no grooves appear to extend in this case. The species is nearly related to C. tubigera, Busk. Hab. Elizabeth Island, 6 fathoms. CELLEPORA MAMMILLATA, Busk. Cellepora mammillata, Busk, Cat. Mar. Polyz. Brit. Mus. p. 87, pi. xx. figs. 3-5. The specimen, which, owing to its growth over a pedicelled knob |