220 A. E. Verrill — Mollusca of the Neic England Coast. 



decidedly oblique and slightly elli[»tical, though somewhat more 

 nearly circular than in the latter. The posterior portion is somewhat 

 less tapered and has the terminal opening a little larger. Its border, 

 Avhen perfect, is usually furnished with four shallow notches, the two 

 nearest the dorsal side being somewhat larger than the others. The 

 most marked distinction is in the more gently tapered form and in 

 the absence of any distinct gibbosity or swelling at the widest 

 portion, the decrease in size being very gradual toward both ends, 

 while in G. Pandionis the widest portion forms a somewhat abrupt 

 enlargement, often amounting to a slight rounded angle when seen 

 in a dorsal view. This feature, with its smoothness, renders it some- 

 what difficult to pick up fresh and moist specimens of the latter with 

 forceps. Both species differ considerably in the amount of the cur- 

 vature of the posterior part of the shell. 



One of our larger specimens is 1 1""'" long ; greatest diameter, 2'1'"'" ; 

 transverse diameter at the anterior end, 1*9 ; diameter at the posterior 

 end -g'"*". 



This species occurred at station 2048, in 547 fathoms, eight living 

 specimens (No. 34,814); station 2092, in 197 fathoms, nine speci- 

 mens (No. 38,122); and off Cape Hatteras, at station 2111, in 938 

 fathoms, one specimen (No. 35,765) ; and station 2115, in 843 fathoms, 

 thirty-six specimens (No. 35,623). 



This species is also closely related to a shallow-water species taken 

 in abundance by the Albatross, off Cape Hatteras, in 14 to 48 

 fathoms. The latter is, however, a smaller species, with a more 

 slender posterior portion and a perfectly circular aperture. 



Cadulus cylindratus Jeflfreys. 



Jeffreys, Ann. Mag. Nat. Hist., February, 1877, p. 158; Proc. Zool. Soc. London, 

 for 1882, p. 664, pi. 49, fig. 6. 



The few specimens I'eferred to this species show some variation in 

 form, some being decidedly curved, others only very slightly so. 

 Tiie shell tapers very slightly from the middle toward both ends, 

 which are very nearly equal in size, circular, and scarcely contracted. 

 The oral aperture is slightly oblique. The posterior opening, in our 

 specimens, is finely and irregularly notched, probably accidentally. 



Length, 7-3""" ; greatest diameter, i-7""'>; diameter of the oral end, 

 1 •4™™ ; posterior end the same. 



Station 2041, in 1608 fathoms, three specimens (No. 38,030). 



Off the coast of Europe, it was taken at several localities by the 



