Ue 
SONAR who 
16 
+t Hinder cardinal teeth smooth. 
2, VENUS. 
. V. verrucosa, t. 514. f. 1,.t. 316. f. 22, t. 316a. f. 7. 
ees toll OC 
V. —, t. 3l6a, f. 4. 
3. CIRCE. 
. 2?C. minima, t. 317. f. 2. 
. Anterior lateral teeth none. Cardinal teeth triangular. 
ovate. 
4. CHIONE. 
C. Chione, t. 315. f. 1. 
. C. florida, t. 3164. f. 1. 
C. leta, t. 316 a. f. 3. 
. C, gallina, t. 316. f. 3, 7. 
C. Sa BUI A 
C. fasciata, t. 316. f. 1. 
C. opaca, t. 317. f. 4. 
C. Thaea, t. 316. f. 5. 
. C. ovata, t. 316. f. 3. 
5. Lucinopsis. 
wo undataste olijenta oe 
. Anterior lateral teeth none. Cardinal teeth compressed. 
oblong. Hinder lateral tooth none or rudimentary. 
6. VENERvPIS. Foot byssiferous. 
V. perforans, t. 313. f. 4. 
V. pullastra, t. 313. f. 7. 
V. decussata, t. 314. f. 2. 
V. castrensis, t. 315. f. 3. 
V. geographica, t. 315. f. 2. 
J Ve lnusstaoloet. 0,10: 
Shell oblong. Hinder lateral tooth large, strong. 
7. TRAPEZIUM. 
T. rostrata (fig. 1). 
Fig. 1.— Trapezium rostrata. 
f, foot aperture. pp, pedal muscles. 
Fam. 2. Cyprinade. 
Shell 
Shelt 
. Anterior lateral teeth none. Cardinal teeth thick, divergent. 
Shell ovate, cordate, covered with a hard dull brown periostraca. 
The hinge-teeth 3°3, triangular; the front of left valve conical, 
