44 systematic arrangement 



1. Verena. 



Character of the family. 

 1. V. borealis, Forbes fy Hartley, B. M. t. I.I. f. 1. 



" Central tooth of Verena borealis Fig- 24. 



with the base wide, sublimate, the tip Verena borealis. 



convex, narrow, cutting edge triangular, 

 minutely toothed on each side, and 

 with one sharp point ; lateral teeth, the <- 

 first with the tip produced, serrated \yU^~^ ^^\^ 



on both sides ; second and third simi- 

 lar, claw-like, simple, slightly curved." — Loven. 



" Animal of Verena borealis with a short broad head, flanked by 

 subulate tentacles set wide apart, bearing the eyes at the extremities 

 of their thickened lower halves (or connate sustentacula) ; mouth 

 inferior; proboscis long, retractile." — Forbes, p. 361. t. . Teeth 

 3*1*3; central triangular, denticulated, with larger central denti- 

 cles ; lateral lanceolate ; inner lateral denticulated on each end near 

 the tip ; outer simple (fig. 24). 



Verena borealis lives in deep water; it is often obtained from 

 the fish caught on the north coast of America. 



This genus differs from Trichotropis in the animal having a pro- 

 boscis instead of a rostrum (see that genus) . 



Dr. Loven refers Verena borealis to the Velutince, and Dr. Philippi 

 refers it to the family Velutinacea (Handb. der Conch. 183). 



B. Mantle siphoned, enlarged, produced over the shell. Shell 

 channeled in front. Operculum none (p. 37). 



Fam. XVI. SYCOTYPID^l. 



Head produced, conical. Tentacles small, near end of the head. 

 Teeth 3*1*3. Mantle enlarged, produced over the shell. Siphon 

 of mantle and canal of shell straight, produced in front. Operculum 

 none. 



1. Sycotypus. 



Shell obovate, thin, cancellated ; spire short ; mouth large, tapering 

 in front. 



1. S. ficus, t. 86. f. 2, t. 261. f. 4 ; Adams, Gen. Moll. t. 21. f. 1. 



2. S. reticularis, t. 261. f. 5. 



C. Mantle not siphoned, more or less covering the shell ; mouth of 

 shell entire. Operculum none (pp. 37, 44). 



Fam. XVII. VELUTINIDiE. 



Foot moderate, rounded. Mantle very large, swollen and thick- 

 ened on the edge, often partly covering the shell, with two emargi- 



