613 



3. Cytiiei?^a viRGiNEA (pi. cxxvii. f. 5), Adams, Voy. 

 Samarang, Moll. p. 78. 



Cyth. testu oblonga, subtriangulari, subscquivalvi, crassu, 

 cinerascente-alba, epidermide vitrea induta, radiatim obscurissime 

 fasciata ; latere postico subcoarctato, subviolaceo, linea impresso. 



Some of the young rayless specimens of C. Crassatelloidcs pre- 

 sent a general resemblance to this shell, which, however, may be 

 distinguished by the contraction of the posterior side. 



Moluccas. 



4. CYTHEiiiEA Damaoides (pi. cxxvii. f. 7, 8, 9), Gra^; 

 Wood, Suppl. Venus, f. 17. C. ponderosa, Koch, Abbild. und 

 Besch. Conch, pi. 1. f. 1. 



Cyth. testa subtrigona, crassa, laevigata, alta, subcompressa ; 

 umbonibus, cardine et ligamento magnis ; margine postico bre\i- 

 usculo, subplanulato, subangulato ; lunula elongata, subdistincta ; 

 margine ventrali antice rotundato, postice prope angulum paululiim 

 contracto; colore pallido, fasciis radiantibus rubescentibus, vel 

 fuscis, vel nullis, ad angulum posticum purpureo unifasciato, 

 intiis albo. 



Shell very thick when fully grown, pale, smooth, with radiating 

 bands of purple or brown, with one darker and broader on the 

 posterior angle ; umbones elevated, rather tumid, slightly leaning 

 towards the hinder side, which is flattened and rather short; 

 ventral edge swollen anteriorlj^, and sHghtly contracted towards 

 the posterior angle. The hinge is very broad and tliick, the 

 ligament large, lateral tooth distant, and interior of the shell 

 pearly wliite. 



Red Sea. 



5. Cyther^a ventricosa (pi. cxxvii. f. 6), MS., Brit. Mus. 



Cyth. testa subtrigona, inflata, altissima, laevi; latere postico 

 late angulato et complanato, latere autico subincurvato ; margine 

 ventrali antice subrotundato ; lunula cordiformi, margine impressa ; 

 colore paUido, fusco fasciatim scripto. 



Shell very ventricose, as deep as long, smooth, with pale angular 

 markings arranged in irregular concentric bands ; the umbones 

 leaning towards the anterior side ; hinder side angolated, with a 

 broad flattened space; lunule heart-shaped, defined at the edge. 

 Mr. Cuming's s])ecimen, which we have figured, is more remark- 

 able in form than those of the British Museum. 



China. 



