DIONE. 



Plate IX. 



Species 35. (Fig. a, b, Mus. Cuming.) 



DiONE hX.T\. Dion, testa sntiqnaclrato-ovatd, inflatd, fid- 

 vescentc'-atha,ferrii(/iiieo-riifo varie radiatd vet aspersd, 

 conci'iifrici irregidariter striatd, tatere aiitlco brevh- 

 sinio, coiitracto. 



The cheerful Dione. Shell somewhat squarely ovate, 

 inflated, fulvous white, variously rayed or sprinkled 

 with rust-red, concentrically irregularly striated, an- 

 terior side very short, contracted. 



Venus tata, Linncsus, Syst. Nat. p. 11.32. 

 Venns affinis, Gmelin. 

 Cytlierea tata, Lamarck. 

 Venns tumescens, Blainville. 

 Cytlierea cordiforviis, Dunker. 

 Dione lata, Deshayes. 



Sab. Philippine Islands ; Cuming. 



The painting of this iufiated squarely oblong species 



is extremely variable in pattern, but always of the same 



peculiar rust-red. 



Species 36. (Fig. a, h, Mus. Cuming.) 



Dione Ktngii. Dion, testa uvatd, lenui, con/pressiuscnld, 

 fulvescente-albd,ferru(/ineo-riifo varie tinctdet radiatd, 

 concentrici irregulariter striata, latere antico brevius- 

 culo, rotimdato. 

 King'3 Dione. Shell ovate, thin, rather compressed, 

 fulvous white, variously stained and rayed with 

 rust-red, concentrically irregularly striated, anterior 

 side rather short, rounded. 

 Venus Kiiiffii, Gray, Wood, lud. Test. Supp. pi. 2. f. 9. 

 Cytlierea Kin//ii, Sowerby. 

 Dione Kinijii, Deshayes. 

 Hub. Island of Nicobar. 



Of a more compressly oval form than D. lata, less ab- 

 ruptly shortened on the anterior side. 



Species 37. (Fig. a, b, Mus. Cuming.) 



Dione infl.^ta. Dion, testd subquadrato-orbiculari, ie- 

 nnicHld,inJlatd,fulvescente-lacted,ferru(jineo-riifo, varie 

 tinctd vel radialim aspersd, concentrici irregulariter 

 striatd, lateribus snbaqualibus. 



The inflated Dione. Shell somewhat squarely orbi- 

 cular, rather thin, inflated, fidvous cream-colour, va- 

 riously stained or radiately sprinkled with rust-retl, 

 concentrically iiTegularly striated, sides somewhat 

 equal. 



Cytlierea injlnta, Sowerby, Thes. Coucli. vol. i. p. 037. 

 pi. 133. f. 137, 138. 

 Dione injlata, Deshayes. 



Hab. Philippine and Molucca Islands, and Port Curtis, 

 Australia. 



This species is also closely allied to D. lata ; an orbi- 

 cular form of it, in which the sides are more equal. 



Species 38. (Mus. Cuming.) 



Dione prora. Diou. testa ovato-trapezoidali, solidius- 

 cnld, albidd vel looted, imniaculatd, epidermide tenia 

 sericed versus margineni, lavigatd, lateribus ad mar- 

 ginem Jle.ruoso-tiimidis, lunuld siihanipld, excavato- 

 curvatd. 



The prow Dione. Shell ovately trapezoidal, rather 

 solid, white or cream-colour, unspotted, with a 

 slight silky epidermis towards the margin, smooth, 

 sides flexuously swollen at the margin, lunule rather 

 large, excavately curved. 



Cytlierea prora, Conrad, Ann. Acad. Nat. Sci. Philadel- 

 pliia, vol. vii. p. 333. pi. 19. f. 18. 



Ilidj. Cape St. Lucas, Xautus, California ; Carpenter. 



A colourless shell, distinguislied by a peculiar trapezoid 

 form. 



October, 18G3. 



