46 ZOOLOGICAL COLLECTIONS MADE DURING [Jan. 4, 



slightly to upper end from short distance above base ; a prominent 

 horny ridge at upper end ; beset at the sides with tubular, partly cal- 

 careous, brittle uiibranched spines, which show a strong constriction 

 of their internal cavity at the point of junction of the horny and cal- 

 careous substances, viz. at about one fifth of their length from the base : 

 about fifteen spines are arranged down each side of the cell. Stolon 

 creeping on foreign bodies. Tentacles between twenty and thirty 

 in number. A gizzard present. No special ooecium observed. 

 Maximum length of zooecium, exclusive of spines, 1'25 millim., 

 maximum exclusive breadth "5 millim. ; maximum length of spines 

 •7 millim. 



Examined. From spirit, in glycerine and after treatment with 

 acid. 



Hab. Sandy Point, 7-10 fathoms. ; on large flexible worm-tube 

 with Halecium, Sertularella, &c. 



Obs, This species appears to be distinguished from C. hirtissima, 

 Busk, by the unbranched character of the spines, by the sessile 

 form of the colony, replacing the Flustra-like branching of that 

 species ; the cell is also about one third larger than appears to be the 

 size of C. hirtissima (although one of the figures given of that 

 species differs in proportion, probably by an error, from the other 

 two), which seems to be about "83 millim. long. The method of 

 basal attachment is not given with sufiicient plainness by Busk ; but 

 it appears probable that it resembles that of our species, and that 

 the tubular processes proceed from the base alone, and not from the 

 sides of the cell as in Diachoris. The back of the cell is bare of 

 spines, thus differing again from C. hirtissima. 



It is noticeable that both species are from the South Atlantic, 

 C. hirtissima being from the Cape of Good Hope. 



Membranipora lacroixi, Audouin. 



Flustra lacroixi, Audouin, in Savigny's 'Egypte.' 



Membranij)ora lacroixi, Busk, Cat. Mus. Brit. ii. p. 60, pis. Ixix., 

 cix. fig. 1. 



The outline of the cells and the calcareous part of the surface 

 corresponds well with pi. Ixix. fig. 4 of Busk, Cat. ITar. Polyz. 

 Brit. Mus. ; but it has, besides, pear-shaped apertures surrounded 

 by distinct rims, in the spaces between the cells ; they vary in 

 position ; and there are from one to two at each side of the cell ; other 

 spaces, whose walls are simply formed by the edges of the cells, also 

 occur irregularly. The spine on each side above the mouth is often 

 present. 



Examined. Dry. 



Hab. Victoria Bank, S.E. Brazil, 33 fathoms, on Cellepora. 



Membranipora curvirostris, Hincks. 



Membranipora curvirostris, Hincks, Ann. & Mag. Nat. Hist. 

 ser. 3, ix. p. 29, pi. vii. fig. 4 ; Hist. Brit. Mar. Polyz. p. 153, 

 pi. XX. figs. 5 and 6. 



A small colony on Fucus corresponds very well with the latter 



