88 



arched or outer margin. 1. G. triumj)iians. Trochus Guilil- 

 forili:e, Gray. 

 '2. G. lu'liophorus. T. iinpcrialis, Quay, t. 40. f. 1. 



12. P.\CHYi>oMA. Oper. oblong, snbquadiangular, very convex 

 I e.\ternally. 1. P. ina>qualis. Trochus i., il/or/yw. "Trochus 



gibberulus, Chemn. 2. P. cixilatus. Trochus c, Gmelin. 



\:i. LiTHOPOMA. Oper. ovate, thick, thicker at the end, with a 

 broad thin margin on outer edge. 1. L. tuber. Trochus t., 



Linn. 



14. Imperator, n. 115. Oper. thin, flat, rather thinner on edge, 



1. I. Solaris. 



15. TuBiCANTHUS, Swains. Oper. ovate, with a shght tubercle 



over axis, and a single svdjcentral arched rib. 1 . T. Cooki- 

 anus. Trochus C, Quoy, t. 40. f. 2. 



1(). BoLMA. Oper. ovate, suborbicidar, convex, with a subcen- 

 tral tubercle over axis and a broad sul)marginal spiral ril). 

 1. B.rugosus. Trochus r., LJ?in.; Joam«s,t. 108. f. 5; Ckiaje,t.\i)'i . 

 f. 1,5, t.43. f.6. 



c. Eutropiana. Mouth and oper. ovate. 



17. EuTROPiA, n. 116. 

 -7*'<< »i^/f n'-^ - 1. E. australis. Phasianella buhmoides, Qwoy, t. 41, f. 1,2. (Cw tier, 

 .trh ^^oL**^^Jiqljy^ Anat. Moll. t. .) 



^^f^^ irfl > — Fam. 2. Liotiadce. 



Operculum homy, VAith an external calcareous coat fomied of 

 numerous separate pearl-like shelly particles placed in spiral lines. 



1. LioTiA, n. 136. Shell variced ; lips thick. 1. L. granulosa. 



Dclphimda g., Diinker. 2. L. Krausii. Solarium cancclla- 

 tum, Kraus. 3. L. cancellata. Uelidi. c, Grwy^U. Cobi- 

 ensis. Reeve. 



2. LiPPiSTKS, n. 248, part. 3/o«//.=Cyclostrema, Leach. Shell 



sul)discoidal ; mouth rourul, li])s scarcely reflexed. 1. L. can- 

 cellata. Cyclostrenia c, Leftc/i. 2. L.jevoluta. Delph. e.. 

 Reeve. 



3. Adeorihs, n. 140. 1. A. subcarinatus. Trochus &., Montague. 



I , V ^ Funi. ',^. TrochidcE. 



Operculum homy, of many gradually enlarging whorls, not covered 

 with a calcareous coat. No frontal fringe between the tentacula. 



* Oiterculum circular, muny-whorled. 



1. Pyramis, n. 117- 



1, P. obeliscus. Trochus o., Quoy, t. 39. f. 3. 



2. Cardinalia, n. 11!). 



1. C. data. Trochus e., Quay. t. 61 f. 22, 26. 



