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" V. testa cordato-orbiculari, tumida, solida, alba, sulcis incre- 

 ment irregularibus, subscalari, radiatini striata; lunula late cor- 

 data; area nulla; margine creuulato." 



I copy the figure and description of this singular-looking shell, 

 which is white, very globose, rather square, radiately striated, and 

 with the umbo leaning very much to the front. 



Strait of Magellan. 



74. Venus rugosa (pi. clx. f. 185, 186), Gmelin, 3276. 

 V. rigida, Dillwyn; Chemn. f. 303. Test. juu. V. cincta, Chemn. 

 f. 387. 



V. testa rotundata, ventricosissima, costellis concentricis laini- 

 natis obtusis margine reflexis subtus duplicatis interstriatis cincta, 

 pallide fulva, rufo-maculata; margine dorsali arcuato, angustato, 

 excavato, valvse sinistrse piano, dextrse laminato ; lunula profunda, 

 cordifurmi ; latere antico brevi, rotundato, margine elevato, intus 

 margine ventrali creuulato. 



A very ventricose shell, with the laminae smooth and continu- 

 ous ; under each one there is generally a small secondary riblet, 

 giving the appearance, in specimens where the edges have been 

 rubbed off, of duplicate ribs. The dorsal margin presents a dif- 

 ference between the two valves, one being smooth, the other la- 

 minated. 



West Indies. 



75. Venus crebkisulca (pi. clxi. f. 187, 188, 189), La- 

 marck, Anim. sans vert. Venus, no. 10. 



Y. testa rotundata, ventricosissima, costellis concentricis inter- 

 striatis omnino (ad latera prsecipue) crenulatis cincta, alba, fusco 

 nigro et rubro radiatim variegata; area, dorsali angusta, valvse 

 dextrse rubro vel fulvo, valvse sinistra? nigro maculata; lunula 

 cordiformi, impressa, punctis aspersa. 



This beautifully variegated shell resembles V. rugosa in form, 

 but the riblets are crenulated, particularly at the sides, and per- 

 haps never laminated. The dorsal area is narrow, presenting a 

 difference in the two valves in colour, one having black spots, 

 the other bright pink or brown. I must admit the uncertainty 

 of identification in respect of this species, which is only 

 adopted "faute de mieux," in order to avoid having to coin a 

 new name. 



Mr. Cuming's specimens are from the island of Luzon, Phi- 

 lippines. 



