720 



Fig 97 is the typical form of a strangely varied series of shells, 

 to which the above names and some others have been given. Tig. 

 98 is the overgrown and obsolete state, V. sjnssa, Wood's Suppl. 

 pi. 16. f. 44. Kg. 92 represents the young shell, in which may 

 be seen its interstitial radiating strise, and in which the concentric 

 riblets are laminated at the jDosterior side. Eig. 95 is an example 

 of zigzag marking. All the varieties are nearly equilateral ; in all, 

 the inner edge is crenulated, and some of the concentric ridges 

 interrupted at the sides, and all have a small, narrow, well-defined, 

 chestnut-coloured lunule. 



New Zealand, Philippines, etc. 



50. Yenus Paphia (pi. civ. f. 61), Linn. Syst. Nat. p. 1129. 



V. testa subtrigona, crassa, alba, fusco-grisescente maculata et 

 lineata, Isevi, costellis maguis rotundatis antice contractis lami- 

 natis postice abrupte contractis laminatim lobatis cincta; latere 

 postico productiore, acuminato ; area dorsali declivi, late planulata, 

 literata, excavata ; umbonibus productis ; latere antico breviuscu- 

 lo ; lunula concava, literata ; margine interno leviter crenulato. 



This well-known species has the broad, smooth, rounded ribs 

 terminating in front in flat thick laminae, and beliind suddenly 

 contracted into broad laminated lobes. 



West Indies. 



51. Venus affinis (pi. civ. f. 62) ? adopted by Sow- 



erhy, jun. 



Y. testa subtrigona, ovali, crassa, alba, fusco radiatim maculata, 

 Ifevi, costelhs crassis reflexis acutiusculis ad latera productis 

 laminatis postice abrupte interruptis turn unilobatis cincta ; la- 

 tere postico productiore, subacuminato ; area dorsali declivi, late 

 planulata, literata, vix excavata ; latere antico breviusculo ; lunula 

 concava, literata ; margine interno leviter crenulato. 



I do not know whether the above name has been published, or 

 by whom it has been proposed, but having found it in MS. I 

 adopt it on the principle of never coining a name when a good 

 one has been used in any way. The affiyiiti/ is to V. Paphia, which 

 the species nearly resembles. It is however a more oval shell, 

 the concentric ridges are more extant and laminar throughout, and 

 at the back suddenly interrupted previous to taking a square lobed 

 form ; the umboes are not so produced. 



Mr. Cuming and Mr. Gubba have specimens which are from 

 Senegal. 



