432 Zoological Society. 



The link between Carolinensis and radiata, uniting the interior and 

 membranaceous wrinkles of the former to the general outline of the 

 latter. 



Cyrena Philippinarum. Cyr. testd maximd, compressd, ohovatd, 

 valde inaquilaterali, ponderosd, antice plicato-sulcatd, epidermide 

 oUvaceo-fuscescente, indutd ; margine ventrali convexiusculo ; liga- 

 mentali subdecUvi, et angulum obtusum cum margine postico for- 

 mante ; natibus integris, approximatis, incumbentibus ; ligamento 

 pergrandi, valde prominente ; superjicie interna postice et inferne 

 purpured, superne albido-ccerulescente ; dentibus cardinalibus cras- 

 slssimis ; lateralibus supra crenatis aut denticulatis, antico vaWk 

 approximato . 

 Index Test. Sup. t. 14. f. 60. Long. 4 ; lat. 4-75 poll. 

 Hab. Philippines. Mus. Cuming, Hanley. 



There are a few narrow diverging folds on the posterior slope, but 

 this character is by no means peculiar to the species, being equally 

 possessed by Keraudreni, obesa and rotundaia. The ligament is dull 

 yellowish, variegated with rich green. The young are of a uniform 

 bright grass-green, and exhibit more decidedly than the adult the 

 vestiges of an incipient lanceolate lunule. 



Cyrena placens. Cyr. testd suborbiculari, subventricosd, incequi- 

 laterali, nitidd, concentrice sulcato-striatd, epidermide virido-fia- 

 vescente indutd ; margine ventrali convexo ; dorsali, utrinque declivi 

 et convexiusculo ; natibus erosis ; ligamento fulvo, depresso, an- 

 gusto ; lunuld nulld ; superjicie internd purpured ; dentibus laterali- 

 bus minutissime rugulosis haud autem crenatis, antico brevi et sub- 

 approximato. 

 Index Test. Sup. 1. 14. f. 52. Long. 1'50 ; lat. 1-75 poll. 



Hab. ? Mus. Hanley. 



A beautiful and rare species, of which I have never seen but my 

 own specimen and that in the Jardin des Plantes at Paris. The 

 sulci are close and regular, and the outline of the sliell, although not 

 very unlike that of radiata, is convex in front of the beaks, thus 

 rendering the front extremity broad and somewhat obtuse. 



Venus subnodulosa. Ven. testd ovatd, crassiusculd, subcequilate- 

 rati, satis convexd, concentrice costatd ; costis confertis, antice me- 

 dioque obtusis, postice in breves lamellas conversis, undique a sulcis 

 radiantibus decussatis ; margine ventrali convexo aut subarcuato ; 

 dorsali, utrinque subdecUvi ; pube et lunuld oblongo-cordatd, pro- 

 minentibus ; ligamento infosso, angustissimo ; margine interno undi- 

 que crenulato ; superjicie internd purpureo pictd. 

 Var. a. Testd albidd, livido-brunneo variegatd. 

 Var. ft. Testd fulvo-fuscescente, natibus albidis ; sulcis subremotis. 

 Index Test. Sup. t. 16. f. 19. Long. 0-58 ; lat. 075 poll. 

 Hab. San Nicholas, Philippines. Mus. Cuming, Hanley. 

 This species bears some resemblance in sculpture to V. Marica, but 

 the shape is quite different. The concentric ribs are rendered sub- 

 nodulous by the radiating grooves. Only a few specimens of this 

 laie shell were procured by Mr, Cuming in the Philippine Islands. 



