some new and peculiar MuUusca. 157 



species of Helix : base notched ou eacli side, as in C. suhfasi- 

 formis. L. 0-2. B. 0-075. 



Station 12, 1450 fins. : one specimen is abnormally arched. 

 * rorfii|tinc ' Kxpt'ditioii, 18(ji), Channel slope, 557 fnis.: 1870, 

 Bay o( Biscay, 292-10^5 fnis. 'Josephine ' Expedition, 110 

 -550 fnis. Fossil at Messina (Segucnza). 



This is much larger and more gibbous than C. suhfasiformis] 

 and, like that species, it varies in shaj)e and size. It has the 

 character on which ]\Ionterosato lays stress in generically sepa- 

 rating C. suhfa.sifuniiis from C ovulum, viz. in the mouth 

 or anterior opening being more or less thickened inside by a 

 circular rib. 



Cadulus gracilis *, JefFr. 



Shell more curved and cylindrical than C. suhfiisiformis 

 (to which it is evidently allied), not swollen in the middle, but 

 throughout nearly equal in breadth ; the mouth slopes more, 

 and has a slight circular rib or thickening within ; base 

 broader ; oblique marks of growth arc conspicuous. L. 0'2. 

 B.0-04. 



Station 13, 690 fms. ; a single specimen. 



Cadidus Olivi, Scacchi. 



Dentalium Olivi, Sc.,Notiz. foss. Gravina (Anu. Civ. 1835), p. 56, tab. 2. 

 fig. G, a, b. 



Station 12, 1450 fms. ; fragments only. ' Porcupine' Ex- 



g.'dition, 1869, AVest of Ireland, 1230 fms. ; south of the 

 nglish Channel, 862 fms.: 1870, Channel .slope, 539 fms. 

 Sicilian Tertiaries (Scacchi, Tiberi, and others). 



Awl-shaped and variable in size. Probably Dentalium co- 

 arctatum of Lamarck, and certainly that of Deshayes and Phi- 

 lippi, is Dischides hijissus. 



C. gadus of Montagu resembles C. Olivi ] but it is not only 

 very much smaller, but is proportionally shorter and less 

 slender, and the anterior end is more contracted. The locality 

 given by Montagu (" many parts of the British Channel "), 

 with tlie mariner's name " Ilakc's-tooth," is at least very 

 doubtful as regards this species ; and it is not unlikely that he 

 may have mistaken for the" Hake's-tooth " Ditri/pa arictina 

 (a testaceous Annelid), which is frequently found adhering to 

 the grease or "arming" of the deep-sea lead in soundings. But 

 his description and figure evidently apply to a species of Ca- 

 dulus from the noted collection of old George Humphreys, the 



« Slender. 



