87 



rate, flat-topped tubercles. 1. S. Classiearius. Turbo Sar., 

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

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



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



1. T. araucanus, D'Orb. t. 108. f. 3. 



2. T. niger, D'Orb. 1. 108. f. 1. 



3. T. radiatus, Eydoux, 1. 107 a. f- 2. 



4. T. chrysostomus, Cuvier, t. 41. f. 6. 



5. T. marmoratus, Quoy, t. 37. f. 1 . 



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



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



** Oper. with one or more spiral ribs. 



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



tral rib, surrounded by a broad flat margin. 



1. M. undulatum. Turbo u., Quoy, t. 38. f. 2, 3, t. 60. 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 subinarginal keel. 1. M. granosus. Turbo g., 

 Martyn. 



5. Callopgma. Oper. with a broad central and three or five sub- 



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

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

 Gray. Oper. ribs 3. 



6. Ninella. Oper. concave externally and edged with two raised 



spiral ribs and a thin edge. 1 . N. lamellosa. Turbo 1., Brod. 



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



7. Collonia. Tuba, n. 1 14, not Lea. Oper. circular, many gra- 



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

 tral pit. 1. C. margiuata. Delphinula m., 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, 

 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. 



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



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

 Trochus Calcar, Linn. 



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., Dunker. 



11. Guildfordia. Oper. flat, with a very slight ridge near the 



