. Ill H.N. 

 C. I I>H.. Moll. K. MM., p, 89, t. ft, !'. 1 3, ( ; 1, J). 



C, /,'///'//'/"'/ .Mr-, in Mol.iu- i li Mauri- 



tius, p. oIKI. 



This species has considerable resemblance : l>ut 



the lateral arca< and end valves an- le.-s Btronglj Sculptured and the 

 longitudinal rihh-ts arc lacking on the central areas except at the 

 diagonal lines. The above description is from Carpenter's J/>. 



C. ANGUSTlco>r\ n> <,Juoy iV (iaiinanl. IM. :51,fii:s. -'IT, 



Shell ovate, wide, little elevated, depressed hehind hy the prom- 

 inence of the anterior valve. The third to the seventh valves are 

 excessively narrow, arcuated hehind. with a little median projection, 

 which contributes to form a dorsal carina. The last valve is the 

 largest of all, nearly orbicular; the second valve is next in size, the 

 intermediate valves being about equal. Sutural plates narrow, 

 separated by a wide, flat, sinus ; insertion-plates denticulate. The 

 end valves have striated teeth. The entire interior is a pretty green ; 

 and this we suppose to be the color of the outside, but it is eroded. 

 AVe think it is striated like our C. rtritlf*. The girdle is scaly, the 

 scales oval. Length 22, width 16, alt. 8 mill. 



Lie of Fi'min; 



C. (ni</nt;cot>itn* Q. & G., Voy. Astrol. iii, p. 398, t. 73, f. 4, 4'. 



The entire substance of Quoy's description is rather freely trans- 

 lated in the above paragraph. It is very likely that this is merely a 

 greatly worn specimen of C.yW//xxoyyr////x Q. & G. 



( '. NKiKoviiMiNS Blainville. PI. 31, figs. 41, 42 (enlarged.) 



Shell ovate, moderately elevated, the dorsal ridge obtuse ; black- 

 ish. Mucro in front of the middle, little raised, the slope behind it 

 straight. 



Valves obtusely beaked; entire surface minutely quincuiK-ially 

 rranulated; jugal area smooth, often eroded; central areas having 

 about 30 delicate lirulse on each side, parallel to the dorsal ridge, 

 sometimes eroded ; lateral areas moderately raised, having 6 to 8 

 delicate granulose riblets, the intervals Hat. 



Interior: anterior valve having 12, central valves 1, posterior 

 valve 14 slits; teeth short, obtuse, coar.-ely pectinated; eaves 

 small : sinus wide, flat, 12-toothed. 



Girdle covered with solid, smooth, lanre and rounded imbricating 

 scales. Length 17'., breadth 10 mill.; divergence 117. 



/ H<>i . 



