134 Zoological Society. 



castaned aut livido-purpurascente basi ornatd ; pube castaneo venu- 

 laid ; superficie interna omninh albidd ; margine integro ; cardine 

 ut in C. Iseta. Long. 1 ; lat. r45 poll. 

 Index Test. Sup. t. 15. f. 33. 

 Hab. Brazil. 



Easily distinguished from IcBta and obliquata by its lunule, and 

 from pellucida (to which in colouring and general contour it approxi- 

 mates) by its close and irregular groove-like striae. 



Cytherea obliquata. C. testd ovato-cordatd {interdum oblongo- 

 cordatd), tumidd aut ventricosd, solidiusculd, sublcevigatd, albidd, 

 lineis angularibus minutissimis brunneis aspersd; margine liga- 

 meniali convexiusculo, subdeclivi ; ventrali subarcuato ; lunuld 

 magnd, indistinctd, colorum experte; natibus valde obliquis, candidis; 

 ligamento angusto ; extremitate posticd obtusd ; superficie internd 

 albd aut albido-rosed ; margine integro . Long. 1*75 ; lat. 2*50 poll. 

 Index Test. Sup. t. 15. f. 24. 



Hab. ? Mus. Cuming, Hanley, &c. 



A species which for a long time has been confounded with Iccta, 

 whose dentition, lunule and general shape it possesses. It is how- 

 ever a broader shell, with the beaks still more oblique, and its surface 

 invariably speckled with minute scattered linear zigzags, which are 

 more closely congregated near the swollen umbones. 



Cytherea plebeia. C. testd suborbiculari, subquadratd, valde 

 inaequilaterali, solidd, compressiusculd, squalide albidd, fulvo varie- 

 gatd (intus lividd), concentrice et confer tissime sulcata; margine 

 ligamentali convexo et subdeclivi ; postico dorsali paululilm subre- 

 tuso et valde declivi ; ventrali arcuato ; umbonibus haud compla- 

 natis et minime striis divaricatis instructis ; lunuld lanceolatd, 

 albd ; margine interna subcrenulato. Long. 1 ; lat. 1'20 poll. 

 Index Test. Sup. t. 15. f. 37. 



Hab. Catbalonga, Philippines. Mus. Cuming, Hanley. 

 This species is allied to the type of its subgenus, the Circe scripta, 

 but the compressed umbones of that shell at once distinguish it. 

 Minute tawny zigzags adorn the whitish ground of the anterior sur- 

 face, whilst the fulvous hue predominates posteriorly. 



Cytherea philippinarum. C. testd cordatd, incequilaterali, ven- 

 tricosd, crassiusculd, pallide lividd, radiis et lineis angulatim 

 fiexuosis saturatioribus variegatd, concentrice costellatd ; costellis 

 convexis, confertis ; interstitiis Icevigatis ; lunuld brevi, cordiformi, 

 albd; rimd livido purpurascente ; margine ventrali integro, arcuato ; 

 superficie internd albidd, maculd lividd sub umbonibus notatd. 

 Long. 80 ; lat. I poll. 



Index Test. Sup. t. 15. f. 36. 



Hab. Philippines. Mus. Cuming, Hanley. 



Very distinctly characterized by its crowded narrow ribs. The 

 dentition is that of its subgenus Chione, and the short white lunule, 

 equally with the narrow ligament, is bordered with livid purple. 



Cytherea diemenensis. C. testd oblong o- cor data, convexd, nitidi- 

 usculd, concentrice et obsolete sulcatd, carneo-fulvd ; radiis angustis 



