186 i III TON. 



< iirdle solid, closely covered with smooth, convex scales. 

 Length 43, breadth 25 mill. ; divergence 105. 

 Length 38, breadth '27 mill.; divergence 100. 

 Length 33, breadth 24 mill.; divergence 112. 



Cape of Goo<l II rl . 



Cli'itm, tuHjin (JuoY & GAIMARD, Y<>y. de 1'Astrol. Zool., iii, p. 



389, t. 74, f. 35-36 (1834). KRAUSS, Die Sudafric. Moll., p. 37. 



C. t'ljmltinhi SOWERBY, Charlesworth's Mag. of Nat. Hist. 1840, p. 



Conch. Illustr., f. 45, and var., f. 85, 86. REEVE, Conch. Icon., 



t. 3, f. 18. 



? C. politits SPENGLER, Skrivter af Naturhist.-Selskabet, iv, p. 

 89, 17l7. 



A smooth, polished species, excessively variable in color and 

 pattern. The short traces of grooves at the diagonal line are rarely 

 visible without a lens, and are completely obsolete in many spec- 

 imens. The smooth surface and unusual coloring are the more 

 striking characters of the species; but the strongly raised lateral 

 areas and the central mucro at once separate it from C. 

 , etc. 



C. RUSTICUS Deshayes. PL 31, figs. 32, 33, 34. 



Shell ovate-oblong, depressed, the jugum rounded ; very dark 

 green, much paler beneath. 



Entire surface quincuncially granulose. Central areas with no 

 other sculpture, but at flu- ilui<j<>n<il //'//" th>rr<n-< <>// e<i<-Ii .'i<l< 10-15 

 -Ao,7 l>nf <!,< t , <j moves. Lateral areas swollen, and having n f> n- 

 indistinct) obsolete swelling rib*, or rather, obsolete knobs irregularly 

 coalescing into indistinct ribs; blotched with paler. End valves 

 similarly sculptured and blotched, beak of the tail valve in front of 

 tin middle, the slope behind it a trifle concave. 



Interior: anterior valve having !, central valves 1, posterior 

 valve 12 slits; teeth pectinated ; eaves short; sinus moderate, with 

 about 13 teeth. 



< Jirdle dark olive, like the valves ; covered with very large stout 

 scales. 



Leiurth '24. breadth 15, alt. 6 mill. 



Length L'n. bivadth l-'J mill.: divergence 1 15. 



<in<I 



