394 DR. GTVYN JEFFREYS ON THE MOLLUSCA OF [June 19, 



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. L. O'l 75, B. r25. 



Station 10, 516 fathoms. 



A great number of living specimens occurred in the tubes of 

 Teredo megotara, which had perforated a sunken log of pine-wood. 

 In these tubes, as well as in the crevices of the wood, also lived 

 numerous specimens of Idas argenteus, which were attached by a 

 strong byssus. See P. Z. S. for November 1882, p. 683. But the 

 statement which I there made as to the present shell having been 

 infested by a sponge is questionable, as I now believe that the hair- 

 like spines which cover the shell belong to it, and are not parasitic. 

 The mollusk is eyeless. Mr. Dall has ascertained that it has different 

 sexes. Herr Friele has kindly supplied me with a sketch of the 

 odontophore (laterals and uncini), which I am now enabled to repre- 

 sent in the accompanying Plate. He could not detect any central 

 or rhachidian tooth. 



^1' 2. CoccuLiNA CORRUGATA^, Jeffreys. (Plate XLIV. figs. 2, 2a.) 



Shell oval, convex, but somewhat depressed, thin, opaque, and 

 lustreless : sculpture, regular, fine, and close-set concentric striae or 

 wrinkles, which are chiefly observable and stronger round the mar- 

 gin, especially in front or at the broader end : colour chalky-white, 

 except at the margin, which is yellowish-brown : beak small, incurved 

 and slightly twisted to one side ; the spire has a single whorl ; the 

 beak is placed close to the hinder margin, and nearly overlaps it : 

 mouth oval : inside smooth : no septum. L. 0'075, B. 0*05. 



A few specimens, with the last, and occurring under the same 

 circumstances. This species differs from O. spinigera in size, sculp- 

 ture, and the position of the beak. It is also eyeless. 



^ '^ 3. Odostomia electa", Jeffreys. (Plate XLIV. fig. 3.) 



Shell conical, thin, nearly transparent, and glossy : sculpture, 

 slight but numerous microscopically visible strise in the line of 

 growth : colour clear white : spire short and oblique, somewhat 

 turreted, and abruptly pointed ; apex globular : whorls 4, rather 

 swollen ; the last is much broader than the next, and occupies three 

 fourths of the shell when placed with its mouth upwards : suture 

 distinct but not deep : mouth oval, occupying half the shell : outer 

 lip rounded and thin, inflected and angulated above, expanded below : 

 inner lip thickened and reflected on the umbilicus, disunited above 

 from the outer lip : umbilicus forming a narrow chink : tooth small 

 and sunken, but conspicuous, situate on the upper part of the inner 

 lip or pillar : operculum withdrawn and not visible. L. 0'085, 

 B. 006. 



A single but living specimen from Station 10, 516 fathoms. 



Its nearest ally is O. i-issdides, which differs from the present 

 species in having a much longer and tapering spire, and in the 

 whorls more gradually enlarging. 



1 Wrinkled. ^ Choice. 



