DIONE. 



Plate IV. 



Species 13. (Mus. nob.) 



PlONE Chione. Dion, testa ovali, iiolid(i,compressiusculd, 

 conceninceprtcalo-siriatd,fiiho-spadiced,fusco-rnljente 

 obscure fasciatd el maculato-radiaid, margine dorsali 

 sidjelevato. 



The Chione Dione. Shell oval, solid, rather com- 

 pressed, concentrically plicately striated, fulvous- 

 fawn, obscurely banded and radiately spotted with 

 fulvous-red, dorsal margin rather elevated. 



Vi-Him Cliione, Linnaeus, Syst. Nat. 12th edit. p. 1131. 

 Pectunculus glaber, Da Costa. 

 Cytherea Chione, Lamarck. 

 Chione vulgaris. Gray. 



Hah. European and Mediterranean Seas. 



This fine species is a very conspicuous object among 

 British bivalves ; it is, however, comparatively rare on our 

 shores. It is abundant in the Mediterranean. 



Species 14. (Fig. a, b, Mus. Cuming.) 



Dione ce.^t.^. Dion, lesld transverse ovatd, snbpectinatd, 

 Jlavescenle-lacled, violaceo-caslaneo radiatd el undatd, 

 concenlrice crebricostatd, Itaitdd el area ligumenti 

 castaneo strigaiis. 



The pretty Dione. Shell transversely ovate, some- 

 what pectinate, yellowish cream-colour, rayed and 



waved with violet-chestnut, concentrically closely 



ribbed, lunule and ligamentary area streaked with 



chestnut. 

 Cytherea pecloralis, Sowerby (not of Lamarck), Thes. 



Conch, p. 625. pi. 130. f. 75. 



Bione grata, Deshayes, Cat. Conch. ]?rit. Mus. p. (i2. 

 Hab. Philippine Islands ; Cuming. 



A well-marked beautifully painted species. 



Species 15. (Mus. Cuming.) 



Dione nobilis. Dion, testd orbiculari-cordald, crassd, 

 Candida, epidermide tenui corned nilenle indutd, con- 

 cenlrice plicaio-costatd, costis valde irregularibus, cor- 

 rugatis, Mc illic intermissis, non parallelis. 



The noble Dione. Shell orbicularly heart-shaped, 

 thick, white, covered with a thin sliining horny epi- 

 dermis, concentrically plicately ribbed, ribs verj- ir- 

 regular, wrinkled, here and there intermitted, not 

 parallel. 



Cytherea nobilis, Eeeve, Pro. Zool. Soc. 1S49, part ii. 

 p. 126. 

 Dio7te nobilis, Deshayes. 



Hab. California. 



This fine shell has verv- much the form of an Artemis. 



The sculpture is a mass of concentric wrinkles. 



August, 1863. 



