630 



dull greyish-brown tint which prevails in the species, some of the 

 varieties are beautifully variegated ; for instance, the variety 

 fig. 87, from CaKforuia, in the collection of Mr. Gubba, and the 

 biradiate variety with bright purple bands, from the Philippines 

 {C. Uradiata, Beechey's Voyage) . The species was first named from 

 specimens brought from the Philippine Islands by Mr. Cuming. 



62. Cytheu^a affinis (pi. cxxxii. f. 101), Pro. Zool. Soc. 

 1835. p. 45. 



'' Cyth. testa ovato-oblonga, planiuscula, lineis distantibus ele- 

 vatis subacutis concentricis albente-violaceis radiata, postice vix 

 sublobata; area postica violacea; lunula pallida, intiis alba; 

 limbo interno Isevi ; epidermide fusca, tenui." 



Shell oblong-ovate, rather compressed, ribbed concentrically, 

 white, with pinkish rays, anterior side short, rounded ; posterior 

 side lengthened, angulated, and acuminated, and near the angle 

 sinuated ; ligament long ; lunule short, defined. 



Xippixapi, West Columbia. Cuming. 



63. Cyther^a tortuosa (pi. cxxxii. f. 102, 103), Broclerip, 

 Pro. Zool. Soc. 1835. p. 45. 



" Cyth. testa oblique cordata, postice sublobata, lineis frequen- 

 tibus subconcentricis obtusis postice irregularibus, alba, umbones 

 versus subspadiceo-alba." 



Shell more rounded and more ventricose than C. affinis, less 

 angular and acuminated posteriorly, with the ribs in some in- 

 stances divided and irregular. We have a dark reddish-brown 

 and a white variety. 



Xippixapi, West Columbia. Cuming. 



64. Cyther^a concinna (pi. cxxxii. f. 99, 100), Soioerby, 

 sen., Pro. Zool. Soc. 1835. p. 23. 



" Cyth. testa ovato-subcordata, crassiuscula, rubente-albicante 

 radiata; latere postico longiore, subacuminato ; costellis nume- 

 rosis, concentricis, obtusis, concinnis, confertis." 



Shell shaped like C. distorta, but with the ribs very much more 

 close and numerous ; the liinder side acuminated, but not angu- 

 lar ; colour brown with wliite rays, or white with one or two 

 brown rays, or with numerous beautifully softened and divided 

 pink rays. 



Panama ; in ten fathoms, fine sand. Cuming. The first-men- 

 tioned variety, fig. 100, is in the collection of Mr. Gubba. 



