CADULUS-GADILA. 163 



ing to the scheme given below, will probably be the most generally 

 useful. 

 I. Species of moderately stout figure. 



1. Species of the Atlantic, Mediterranean and Gulf of Mex- 



ico. 



2. Species of west America, Cape Horn to Alaska, p. 177. 



3. Indo-Pacific and Australasian species, p. 182. 



II. Needle-shaped species, with the swelling very near the aperture. 



Group of C. dentalinus, p. 188. 



1. Atlantic, Mediterranean and Antillean species. 



Group of C. subfusiformis. 



Small forms, but little swollen, with the greatest diameter situated 

 near the middle of the length. 



C. SUBFUSIFORMIS (M. Sars.) PI. 24, figs. 29, 31, 32. 



Shell cylindric, long, subfusiform, only a very little swollen in the 

 middle, a little arcuate, almost equally tapering at each end, thin, 

 pellucid, very smooth, shining, the apical orifice a little narrower 

 than the mouth. Length 2"6, diam. 0*5 mill. (G. 0. Sars). 



Scandinavia, from Finmark to Christiana Fjord, in 40-650 fms. 

 (Sars), Shetland (Jefl^reys). Bay of Biscay (Travailleur). Pal- 

 ermo (Monterosato). 



Siphonodentalium subfusiforme M. Sars, Forh. Videns. Selskabet, 

 1865, p. 301-307, pi. 6, f. 36-40 ; pi. 7, f. 4l-4i.— Cadulus subfusi- 

 formis Sars, Jeffreys, Ann. Mag. Nat. Hist. (3), xx, p. 251 (1867) ; 

 (4), ii, p. 299,301 (1868); (4), v, p. 274 ; vi,p. 74 (1870) ; (5), vi, 

 p. 375 (1880) ; P. Z. S., 1882, p. 664.— Arad. & Ben., Conch. Mar. 

 Sicil., p. 118 (1870).— G. O. Sars, Moll. Reg. Arct. Norv., p. 106, pi, 

 20,f 14a-6. 



Helonyx subfusiformis and var. abyssicola Monts., Nuovo Rivista 

 Conch. Med., p. 20, 21 (1875). Not C. subfusiformis Jefl'reys, Brit. 

 Conch., V, p. 196, pi. 101, f. Z=ajeffreysi Monts. 



In C. subfusiformis the mouth is circular and abruptly truncated ; 

 in C. jeffreysi the mouth is rounded-oval and obliquely truncated. 

 Both species occur on the western coast of Norway as well as in 

 Shetland (Jeffr.). 

 Var. abyssicola Montersato. Very small, although adult. 



Palermo, in 210 meters. 



