TRICHOTROPIS. 361 



simulate a rudimentaiy canal ; columella flattened, per- 

 forated. Operculum corneous, subconcentric, its nucleus 

 lateral. 



Animal 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, tongue with a 

 single series of hooked and serrated central denticles flanked 

 by three rows of curved laterals on each side, of which 

 the innermost only are serrated. Siphon scarcely exserted, 

 distinct ; margins of mantle simple, not reflected : foot 

 broad, quadrate in front, rounded but not produced behind. 



Of this very curious genus but few species are known, 

 and those yet discovered are natives of the Boreal Seas. 



T. BOKEALis, Broderip and Sowerby. 



Plate CI, fig. 5, 6, and (Animal) Plate II. fig. 1. 



Murex carinaius (not of Pennant), Laskey, Mem. Werner. See. vol. i. pi. 8, 

 f. 9 (copied by Brown, 111. Conch. G. B. pi. 5, f. 31 , 32, 33) 

 probably. 

 Trichotropis borealis, Brod. and Sow. Zool. Joiirn. vol. iv. p. 375. — Maclaurin, 

 Berwick. Club, vol. ii. p. 40.— Alder, Cat. Moll. Nortli- 

 umb. and Durh. p. 66. — Gould, Invert. Massacli. p. 300, 

 f. 207. — Dekay, New York Moll. p. 1 37, pi. 8, f. 1 78. 

 — MiDDEND. Malae. Rossica, pt. 2, p. 108. 

 Fusus umhiUcatus, Smith, Mem. Werner. See. vol. viii. pt. 1, p. 98, pi. 1, f. 2. 

 Tricliotropis cosiellaia, Couthouy, Boston Journ. N. H. vol. ii. p. 108, pi. 3, f. 2. 

 —Jay, Cat. Shells, ed. 2, p. 113, pi. 1, f. 17, 18. 

 „ acuminata, Jeffreys, Malacolog. Magaz. pt. 2, p. 36 (no descrip- 



tion). — Brown, Illust. Conch. G. B. p. 126, pi. S7, 

 f. 15. 

 „ Atlantica, Beck in Mtiller, Index Moll. Grrenl. p. 12, from types. 



„ conica, Moller, Index Moll. Grcenl. p. 12 (from description) pro- 



bably. 

 Fusus Lasheyi, Macgilliv. Moll. Aberdeen, p. 170. 



Trichotropis umhiUcatus, Macgilliv. Moll. Aberd. p. 330. — Brit. Marine Conch, 

 p. 209, f. 54. 



VOL. III. 3 A 



