COCCULINA. 135 



slender, cylindrical tentacles, and is apparently without eyes. 

 (Verrill.) Length 1, breadth 1, height 1 mill. 



OffS.-E., New England, 499 fms. 

 Cocculina conica Verrill, Trans. Conn. Acad, vi, p. 204. 



C. spinigera Jeffreys. PI. 25, figs. 9, 10. 



Shell oval, convex, rather thin, semi-transparent, somewh at glossy, 

 especially on the upper part, where the spines have disappeared ; 

 sculpture: extremely numerous and delicate stride which radiate to- 

 wards the margin ; these stria? are crested by rows of minute 

 tubercles, each of which supports a fine short hair-like spine or 

 prickle ; the spines are easily removed, and disappear when the shell 

 is subjected to the action of potash-water, showing that they are of a 

 chitinous nature ; the -apex is quite smooth ; colour white ; beak 

 very small, incurved and twisted downwards, forming a single 

 whorl ; it is persistent, but sometimes broken or injured by attrition ; 

 its propinquity to the hinder margin is in the proportion of 2$ to 6 

 as representing the total length of the shell ; mouth oval ; inside 

 polished ; there is no septum. (Jeffreys.) 



Length 0'175, breadth -125 in. 



Northeast Atlantic and off New England, 335-843 fms. 



This species, obtained by Dr. Jeffreys in the Porcupine and Triton 

 dredgings in the north Atlantic, is much smaller than either of the 

 two preceding, or the specimens I have seen may not be fully grown, 

 averaging only 1*5 to 2'0 mill, in length. It has the form of C. 

 beanii, so far as the shell is concerned, with the sculpture of the most 

 strongly sculptured specimens of that species, which, as above 

 mentioned, sometimes have minute spinose projections at the inter- 

 sections of the radiating and the concentric ridges. The nucleus, 

 however, in the specimens of C. spinigera examined was constantly 

 present, symmetrical and subspiral. 



One feature which is often noticeable on the sedentary deep-sea 

 shells, and especially on the limpets, is perhaps worth mentioning. 

 A sort of spongy organism, apparently a sponge or a hydractinian, 

 often covers the upper surface with a coating of fine straight spinules, 

 which appear to be attached to the shell but are easily removed by 

 wetting and rubbing. They are very abundant on Terebratulina 

 Cailleti and other sculptured brachiopods, and I have observed them 

 on all the species of Cocculina and on Lepetella. Dr. Jeffreys states 

 that the spinules are not soluble in potash. There has been no dis- 



