DIONE. 



Plate III. 



Species 10. (Mus. Cuming.) 



DioNE sau.^LiDA. DioH. teslii suhcordalci, postice siib- 

 alleiiuala, iti/ra epidermide corned niteute sordidi 

 fused, exilissime radiatd, versus umbonea marmoratd 

 el nndato-tnaculatd, lavigatd. 



The ugly Dione. Shell subcorilate, slightly attenuated 

 posteriorly, dull fuscous beneath a shining homy 

 epidermis, very fiiintly I'adiated, mottled, and wave- 

 blotched towards the umboes, smooth. 



Cytherea squalida, Sowerby, Pro. Zool. Soc. 1835, p. 23. 

 Venus squalida, D'Orbiijny. 

 Cytherea biradiata, Sowerby. 

 Cytherea elegans, Koch. 



Hah. California ; Philippine Islands. 



The mottled pattern of this otherwise dull species is 

 very characteristic. 



Species 11. (Fig. a, b, Mus. Cuming.) 



DiONE MACULATA. Bioti. tesld ovali, compressiusculd, 

 postice oblique subproductd, spadiceo-albd, violaceo- 

 fusco maculatd vel undatd, epidermide nilente corned 

 indutd. 



The spotted Dione. Shell oval, rather compressed, 

 posteriorly obliquely somewhat produced, fawn-white, 

 blotched or waved with violet-brown, enveloped with 

 a shining horny epidermis. 



Pecluncttlus maculatus. Lister, Conch, p. 270. f. 106. 



Ze Jouret, Adamson. 



Venus maculata, Linnajus. 



Cytherea maculata, Lamarck. 



Diijue maculata, Gray. 

 Hub. West Indies; Brazil; Pacific Ocean. 



An ancient and well-known species, widely distributed 

 in both hemispheres. 



Species 12. (Mus. Cuming.) 



Dione aurantia. Dion, testd globoso-ovatd, crassd, tur- 

 gidd, carneo-aurantid, epidermide Iwvigald corned in- 

 dutd, coucentrice obscure plicato-striald, postice vix 

 angulatd. 



The okange Dione. Shell globosely ovate, thick, 

 swollen, flesh-tinged orange, covered with a smooth 

 liorny epidermis, concentrically obscurely plicalely 

 striated, scarcely angled on the posterior side. 



Chione aurantia. Gray, Analyst, vol. viii. p. 305. 

 Cytherea aurantiaca, Sowerby. 

 Dione aurantia, Deshayes. 



Hab. Acapulco, South America. 



The delicate flesh-orange colouring of this ftne species 

 is reduced to a more or less dull horny hue by the over- 

 lying epidermis. It is of a bold globose form, indistinctly 

 angled on the posterior side. 



August, 18G3. 



