436 MURICID^. 



peduncles, extending nearly half the length of the tenta- 

 cles. Foot rather short, truncated in front, ohtuse poste- 

 riorly ; operculigerous lobe simple ; siphon rather short, 

 seldom projected far from the canal of the shell. Tongue 

 armed with triple rows of teeth, the axile one transversely 

 elongated and quadrate, armed with denticuli, the laterals 

 simply uncinate or hamate. 



For this small but natural group of Muridda we have 

 reserved the name TropJion^ though it is used by several 

 authors in a wider sense. The species are inhabitants 

 chiefly of deepish water, and for the most part belong to 

 arctic and boreal seas. 



T. CLAXHRATUS, Linuffius. 



With longitudinal lamellar riblets, but no regular spiral 

 sculpture. 



Plate CXI. figs. 1, 2, and (Animal) Plate S. S. fig. 3. 



Murex clatJiratus, Linn. Syst. Nat. ed. 12, p. 1223 (from type). 

 Tritonium clathraium, MulleRjZooI. Dan. Prod. No. 2941. — 0. Fabric. Fauna 

 Greenland, p. 400.— Loven, Ind. Moll. Scand. p. 12.— 

 MiDDEND. Malac. Ross. pt. 2, p. 125 (partly). 

 Murex Baniffius, Donov. Brit. Shells, vol. v. pi. 169, f. 1. — Mont. Test. Brit. 

 Suppl. p. 117. — Maton and Rack. Trans. Linn. Soc. 

 vol. viii. p. 149.— Pennant, Brit. Zool. (ed. 1812), p. 2«5, 

 pi. 82, f. 2. — TuRT. Conch. Diction, p. 95. — Brown, Illiist. 

 Conch. G. B. p. 7, pL 6, f. 1, 4. — Dillw. Recent Shells, 

 vol. ii. p. 742.— Wood, Index Testaceolog. pi. 27, f. 126. 

 Fustis Bamfius, Fleming, Brit. Anim. p. 351. — Forbes, Malac. Monensis, p. 27, 

 animal. — Johnston, Berwick. Club, vol. i. p. 235. — Brit. 

 Marine Conch, p. 206, f. 96.— Dekay, New York Moll. 

 p. 148, pi. 36, f. 339. 

 „ Bamffius, Gould, Invert. Massach. p. 289, f. 198. 

 Pleuroioma Banffium (not Trophon Banflii of Moller), Macgilliv. Moll. 



Aberd. p. 171. 

 Fiisus Banffius, Reeve, Conch. Icon. vol. iv. pi. 21, f. 91 (for 90). 



The shape of the shell is fusiform or oval-fusiform, being 

 more or less swollen just below the middle, and abruptly 



