87 .; 



?ate, flat-topped tubercles. 1. S. Classicarius. Turbo Sar., 

 Linn. Oper. thin ; tubercles separate. 2. S. natalensis. 

 Turbo n., Kraus. Oper. thick ; tubercles crowded. 



2. Turbo, n. 110. Oper. externally convex and granular. 



1. T. araucanus, D'0r6. t. 108. f.,'i ^ , - *' - J ,M»i ,x>^ krA 



2. T. ni^er, B'Orh. t. 108. f. \. s.£Ltum^^*^^'^^ ^^^ ^'^ i^9l.m CU^ 



3. T. radiatus, Eydoux, t. 107 a. f. 2. ^' /« 



4. T. chrysostomus, Cuvier, t. 41. f. 6. ^ O ^ i^ua^^a^ /- 'To/jLS.U^ 



5. T. marmoratus, Qmy, t. 37. f. 1 . • ^vt^^ 4i±t>A^=^ " ' // 



.6. T. tuberculosus, Quoy, t. 38. f. 5. 



7. T. smaragdus, Quoy, t. 38. f. 1, I 



** Oper. tvith one or more spiral ribs. i 



3. Marmorostoma, n. 113. Oper. with an indistinct subcen-' 



tral rib, surrounded liy a broad flat margin. 



1. M. undulatum. Turbo u., Quoy, t. 38. f. 2, 3, t. GO. f. 9-14. 



2. M. versicolor. Turbo v., Quoy, t. 38. f. 4, 6. ; 



4. MoDELiA. Oper. with a convex, subcentral granular rib, and 



a sharp-edged submarginal keel. 1. M. granosus. Turbo g., 

 Alartyn. 



6. Callopoma. Oper. with a broad central and three or five sub- . : 



marginal spiral ribs, outer ribs toothed. 1. C. fluctuosum. : 



Tm-bo fl.. Gray. Oper. ribs 5. 2. C. saxosum. Turbo s., 



Gray. Oper. ribs 3. J 



xtM^ Kki^X 6. NiNELLA. Oper. concave externally and edged with two raised i 



I . ^t^^/*-*^*^ spiral ribs and a thin edge. 1 . N. lamellosa. Tm-bo 1., Brod. ; 



2. N. torquata. Turbo t., Quoy, t. 39. f. 2. 



7. CoLLONiA. Tuba, n. 114, not Lea. Oper. circular, many gra- 



dually enlarged whorls, with a convex external rib and cen- 

 tral pit. 1. C. marginata. Delphinula ni., Lamk. 2. C. \ 

 striata, Gray. Shell red, white marbled, striated. Africa. 



b. Imperatorina. Mouth subquadrate, oper. oblong or ovate. 



8. UvANiLLA, Gray. Oper. flat, with two distinct convex radia- 



ting ribs, lower one straight and nearly parallel to the edge, i 



upper arched, subcentral, axis imperforate, callous. 1. U. ' 



olivaceus. Trochus o.. Gray. 2. U. unguis. Trochus u.. 

 Gray. 



3. U, fimbriatus, Trochus f., Quoy, t. 38. f. 9. I 



9. Calcar. Oper. thick, with a shght convexity over the axis, j 



outer edge thin, axis perforated. 1. C. magnus, Chemn, j 



Trochus Calcar, hinn. 



2. C. stellaris. Trochus s., Quoy, t. 39. f. 4. 



10. PoMAULAx. Oper. flat, with three convex radiating ribs ; 

 upper submarginal, axis perforated. 1. P. undosus. Tro- 

 chus u.. Gray. 2. P. japonicus. Trochus j., D tinker. j 



11. GuiLDFORDiA. Opcr. flat, with a verv slight ridge near the ^ ^^^^Z^*^^^*-*-**- 



