BIVALVE SHELLS. 45 



Cvtherea Birmanica, Phil. Ahhild. und Beschr. Cyther. p. 42. 

 'pl. 9. f. 8. 



Hab. Mergui, imperium Birmanorum. 



10. CUNEUS VAGINALIS. 



C. testa ovato-orbiculari, subtrigona, convexiuscula, anterius 

 compressa, laevi, carnea, maculis radiantibus rufis virgata; intus 

 rosea, margine crenulato ; ano lineari-lanceolato ; vulva pro- 

 funde impressa, patente. 



Cytherea vaginalis, Menke, Moll. Nov. Holl. p. 42. 

 Catlow, Cat.^. 40. no. 114. 

 Fhilippi, Ahhild. Conch. p. ^Q. pl. 4. f. 2. 



Hab. Nova HoUandia occidentalis. 



Genus 5. trigona. 



Animal ignotum. 



Testa triangularis, cuneiformis, subsequilateralis, inferne acuta, 

 margines integerrimi; cardo 3-5-dentatus, alter 4-6-dentatus, 

 dente laterali antico, angusto, elongato, compresso ; impressione 

 pallii postice sinuosa ; sinus brevis, obliquus vel subhorizontalis. 



Periostraca velutinacea argentea, spiculis tenuissimis calcareis 

 constans, siccata decidua, Gray, Ann. ^Mag. N. H. iv. 1849, 

 296 ; vi. 1850, 143. 

 Pectunculus triquetrus, Lister (1685), Conch. pl. 251. 

 Venus (spec), Born (1780), Test. Mus. p. 65, 



(spec), Chemnitz (1782), Conch. t. vi. p. 328. 

 (spec), Schroter (1783), Einl. t. iii. p. 159. 

 (spec), Dillwyn (1817), Cat. t. i. p.'l72. 

 Cytherea, Lamarck (1818), An. s. Vert. t. v. p. 559. 



Ferussac, BlainviUe, Deshayes, Sowerhy, Sfc. 

 Trigonella, Conrad (1837), Amer. Fhil. Soc. ser. 2. t. 5 (nonDa 

 Costa, nec Llhwyd). 



Hinds, Voy. Sulph. 1844, ZooL p. 65. 

 Trigona, Megerle (1811), Mag.filr die neust. Entdeck. p. 55. 

 Schumacher (1817), Essai d'une Nouvelle Classif. p. 153. 

 Gray (1838), Cat. of Cyth. Analyst, t. viii. p. 304; (1842), 

 Syn. Brit. Mus. p. 74 ; (1847), Froc. Zool. Soc. p. 183, 



