134 Zoological Society. 



castaned attt livido-purpurascente basi 07'natd ; pube castaneo venu- 

 latd ; superficie interna omnino albidd ; margine integro ; cardine 

 ut in C. Iseta. Long. 1 ; lat. 1*45 poll. 

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

 Hab. Brazil. 



Easily distinguished from Iteta and obliquata by its lunula, and 

 from pelhtcida (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 out ventricosd, solidiusculd, subkevigatd, albidd, 

 lineis angnlaribiis minutissimis brunneis aspersd ; margine liga- 

 mentali convexiusculo, subdeclivi ; ventrali subarcuato ; lunuld 

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

 ligamento angusto ; extremitate posticd obtusd ; superjicie internd 

 albd ant 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 l<2ta, 

 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 suborbicidari, subquadratd, valde 

 incequitaterali, solidd, compressiiisculd, sqiialide albidd, fulvo varie- 

 gatd (^intus lividd), concentrice et confertissime sidcatd ; margine 

 ligamentali convexo et subdeclivi ; postico dorsali paululimi siibre- 

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

 natis et 7ninime striis divaricatis instructis ; lunuld lanceolatd, 

 albd; margine interno 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 svripta, 

 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 philippixarum. C. testd cordatd, inceqnilaterali, ven- 

 tricosd, crassiusculd, pallide lividd, radiis et lineis angulatim 

 Jlexiiosis suturatioribus variegatd, concentrice costellatd ; costellis 

 convexis, confertis ; interstitiis Icevigatis ; lunuld brevi, cordi/onni, 

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

 superficie internd albidd, mactild lividd sub umbonibus notatd. 

 Long. SO ; lat. I poll. 



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



Hab. Philippines. Mus. Cuming, Hanley. 



Very distinctly characterized by its crowded naiTow 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 oblongo-cordatd, convexd, nitidi- 

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



