TRIBE NYMPHACEA. 55 



with concentric ridges, the interstices transversely striated, and in 

 parts sub-decussated. 1 £. 



V. Distans. Lam. 5. Rhombic ovate, white, spotted with 

 fulvous, finely striated longitudinally, a few distant tranverse ridges. 

 — South Seas, Island of St. Peter and St. Francis. — This and the 

 preceding closely resemble V. Irus. 



V. C ren ata. Lam. 6. — Del. t. 5. f. 2. Ovate, anteriorly 

 rounded, fulvous white, with longitudinal and distant transverse 

 grooves, which towards the margin are crenated and ridge -like; 

 violet within. If. — New Holland. 



V. Carditordes. Lam. 7- — Del. t. 5. f. 3. Ovate-oblong 

 and obtuse at the extremities, anteriorly narrower, whitish ; girt 

 with transverse ridges, the interstices longitudinally ribbed : within 

 quite white. 1-J. — New Holland. Much resembling the last. 



V. Lajonkairii. Pay. t. 10. f. 11, 12. — Desk, in Lam. 6. 

 p. 164. Orbicular, sub-equilateral, gibbous, transversely grooved 

 and longitudinally striated ; beaks tumid, hooked and close : 

 posterior depression somewhat heart-shaped. — Corsica and Sicily. 



V. Monstrosa. Gray. Ann. Phil. 25. — Venus M. Gmel. 

 3280.— D. p. 203.— Ch.f. 445, 6.— W. t. S.f. 112. Oval, one 

 valve larger than the other, dirty white internally, spotted with 

 purple, decussated by the strise, rounded at both ends, but broader 

 posteriorly. f..l^. — Nicobar Isles. 



TRIBE NYMPHACEA. 



Never having more than two primary teeth in the same valve ; 

 often gaping at the lateral extremities: ligament external; 

 nymphce usually projecting outward. 



Section. — N. Solenaria. 



SANGUINOLARIA. 



Transverse, somewhat oval, slightly gaping at the lateral extre- 

 mities ; ventral margin arched, and not parallel to the dorsal 

 one ; hinge with two approximate teeth in each valve. 



S. Occidens. Lam. 1. — Solen Occidens. Lin. 3228. — 

 D. p. 68.—^. t. 226. /. 2.—Ch.f. 61. —W. t. 3.f. 29. Nearly 

 elliptic, one end rounded, the other very slightly truncated, rather 



1 We have figured the shell usually considered as this species, 

 ot vouching however for its identity. 



