736 



96. Yenus scalarina (pi. clxii. f. 215-220), Lamarck, 

 Anim. sans vert., Fenns, no. 54. Var. V. conularis, Lamarck, 

 no. 78? 



V. testa oblique ovali, compressa, costis elevatis uumerosis ad 

 latera paucis lamelliformibus cincta, albida, griseo punctatim lite- 

 rata, vel rufa fusco Kneata, vel alba; intus frequenter postice 

 purpureo picta; latere postico oblique producto, subacuminato ; 

 latere antico brevi ; lunula et area dorsali elongatis, plauulatim de- 

 pressis ; margine ventrali Iffivigato. 



Obliquely oval, rather flat, with elevated, Scalariform ribs, 

 which are fewer in number, and more laminar and produced at the 

 sides ; lunule and dorsal area both long and smooth, inner margin 

 smooth. The typical colouring is by dull greyish spots in zigzag 

 rows. In some varieties the ribs are nearly obsolete in the middle 

 of the shell. The three following species are nearly connected 

 with this, and, it is just possible, may be only local or accidental 

 variations. 



Australia. 



97. Venus Peronii (pi. clxii. f. 224), Lamarck, Anim. sans 

 vert. V. no. 81. 



V. testa V. scalarina simili, sed magis ventricosa et ovaH ; 

 costellis planulatis, ad latera subobsoletis. 



More full and oval than V. scalarina, with the ribs flat in the 

 middle, and nearly obsolete at the sides. 



Australia. 



98. Yenus aphrodina (pi. clxii. f. 221), Lamarck, Anim. 

 sans vert. V. no. 80. Yar. Y. aphrodinoides, Lamarck, V. no. 84. 



Y, testa V. scalarina simili, sed hand tantum obliqua, semper 

 concolori ? costellis magis numerosis, medio depressiusculis, pos- 

 tice subobsoletis. 



The tendency of this species (if distinct) is to be less oblique 

 than V. scalarina, with the ribs smaller and more numerous, 

 much depressed in the centre, and nearly obsolete at the hinder 

 part. It is not so plump and rounded as V. Peronii. 



Australia. 



99. Yenus strigosa (pi. clxii. f. 222, 223), Lamarck, Anim. 

 sans vert. F. no. 79. 



Y. testa V. aphrodina simili, sed costeUis crenulatis. 



