432 Zoological Society. 



The link between CaroUncnsis and radiata, uniting the interior and 

 membranaceous wrinkles of the former to the general outline of the 

 latter. 



Cyrena Philippinarum. Cyr. testa max'und, compressd, obovatd, 

 valde inaquilaterali, ponderosd, antice plicato-sulcatd, epiderinide 

 (fiivaceo-fuscescente, indutd ; margine ventrali convexiusculo ; liga- 

 mentali siibdecVivi, et anguJum obtusum cum margine postico for- 

 mante ; natibus integris, approximatis, incvmbentibus ; Ugamento 

 pergrandi, valde prominente ; superficie interna postice et in/erne 

 purpurea, siiperne albido-cccrulescente ; dentibus cardinalibus cras- 

 sfssimis ; lateralibus supra crenatis aut denticulatis, antico valdi 

 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 sloj:)e, but 

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

 possessed by Keraudreni, obesa and rotundata. 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 suborbiciilari, subvenfricosd, incequi- 

 laterali, niiidd, concentrice sulcato-siriatd, ejndermide virido-fia- 

 vescente indutd ; margine ventrali convexo ; dorsali, utrinque declivi 

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

 gusto ; lunula nulld ; superficie interna purpurea ; dentibus laterali- 

 bus minutissime rugulosis hand autem crenatis, a7itico brevi et sub- 

 approximato . 

 Index Test. Sup. t. 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 PI antes at Paris. The 

 sulci are close and regular, and the outline of the shell, 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, crassiusadd , subcequilate- 

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

 dioqiie ohtusis, postice in breves lamellas convcrsis, undique a sulcis 

 radiantibus decussatis ; margine ventrali convexo aut subamiato ; 

 dorsali, idrinque subdeclivi ; pube et lunula oblongo-cordatd, pro- 

 tninentibus ; Ugamento infosso, angustissimo ; margine interna undi- 

 que crenulato ; superficie interna purpurea pictd. 



A'ar. a. Testd albidd, livido-brunneo variegatd. 



Yds. fj. Testd fulvo-fuscescente, natibus albidis ; st/lcis 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 arooves. Only a few specimens of this 

 raie shell were procured by Mr. Cuming in the Philippine Islands. 



