30 THE 70YAGE OF H.M.S. CHALLENGER. 



and the loop was not preserved. My identification is, therefore, given with reser\ e. The 

 Mediterranean is the chief habitat of the var. minor. It occurs at Vigo Bay. Mr Friele 

 was so fortunate as to dredge one specimen of this species off Jan May en Island during the 

 Norwegian Arctic Dredging Expedition of 1877, in a depth of 263 fathoms. This identi- 

 fication was confirmed by Dr Gwyn Jeffreys, for whose inspection and my own Mr Friele 

 kindly sent the specimen under the name of Ter. arctica. Ter. 'minor occurs fossil in the 

 Pliocene formation of Sicily. 



Observations. — I was rather surprised to find this small variety of Terehratula vitrea so 

 far from the Mediterranean. I showed the Challenger specimens to Dr Gwyn Jeffreys, who 

 placed them among a number obtained by himself from the Bay of Naples. Had we not 

 previously marked the larger Cape specimens, we could not have distinguished them. 

 This fact is, I think, sufficient proof of their identity. The question may, indeed, be 

 further mooted, whether Philippi was not correct in considering Ter. minor or affinis as 

 merely a small variety of Ter. vitrea. Professor Suess, however, believes the former shell 

 to be specifically distinct from Ter. vitrea. Dr Gwyn Jeffreys and myself were also at 

 one time disposed to consider the Ter. davidsoni, A. Adams (Annals and Mag. Nat. Hist., 

 3d ser., vol. v. p. -12, 1860, dredged at Satanomoski, Japan), as identical with" Ter. 

 vitrea or affinis. This view is not, however, shared hj our distinguished contemporary, 

 Mr Dall. 



Terebratida moseleyi, Dav., n. sp. (PI. II. figs. 12-14). 



Shell broadly ovate, semigiobose, rather longer than wide, broadest anteriorly, slightly 

 tapering posteriorly, marginally and laterally convex, nearly straight in front, margin 

 sometimes thickened, surface smooth, white. Dorsal valve uniformly convex without 

 fold or sinus, ventral valve slightly deeper than the opposite one, uniformly convex. . 

 Beak moderately produced, slightly incurved, and truncated by a circular foramen 

 separated from the hinge-line by a very narrow and small deltidium ; beak ridges not 

 defined. In the dorsal valve the loop is short and simple, the labial appendages occupy- 

 ing about two-thirds of the length of the valve, united to each other by a membrane, the 

 central coil making about three turns. Shell structure perforated by numerous small 

 canals. Length 23, breadth 21, depth 14 mm. 



Habitat. — Dredged west of Kerguelen Island on January 3, 1874, at Station 148, lat. 

 46° 47' S., long. 51° 37' E. Depth, 210 fathoms. Sea bottom, rock. 



Observations. — Five specimens of this shell were obtained, all of about the same size. 

 It seems to be a smaller species than Ter. vitrea and Ter. cubensis its nearest allies. It 

 is less elongated, not c^uite as convex as in the last two species, and does not j^resent the 

 datness and angularity observable in the mesial and labial portions of the ventral valve of 

 Ter. cubensis. I made an examination of the animal of one of the specimens which did not 

 differ materially from Ter. vitrea. The mantle is thin and not furnished with setse at its 



