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CYEENA.—BATISSA. 207<br />
conical and the posterior are somewhat elongated and flattened.<br />
The striae are more or less obsolete. Thfe epidermis is light green<br />
and polished. The ligament is narrow, elongated, and not<br />
prominent."<br />
The only specimens of this species which the author has been<br />
able to see are those in the British Museum, two in number,<br />
•vvhicJ], though they agree well with Prime's description and figure,<br />
are much smaller, having somewhat the appearance of young<br />
specimens ; their measurements being as below :—<br />
Long.<br />
Lat. .<br />
Diam.<br />
1.<br />
4S<br />
47-5<br />
24<br />
2.<br />
4G mm.<br />
49 mm.<br />
24'5 mm.<br />
331. Cyrena galathese (March).<br />
Cyrena (Conieocyclas) qalathcm (Reinhardt BIS,), Morcli, Cat.<br />
Conch. Kierulf, 1850, "p- 32, pi. 2.<br />
Cyrma galathea, Prime, Cat. Corb., 1863, p. 6; 1869-70, p. 144,<br />
no. 38.<br />
Oriffmal description :—Testa cordato-trigona, insequilatei-a,<br />
turgida, concentrice striata, postice longiore, truncata, antice et<br />
inferne angulata, umbonibus distantibus, prominentibus ad ^<br />
anter. sitis ; lunula rhomboidali, medio carinata; area lanceolata,<br />
convexa, ligamento tumido duplo longiore. Dentibus lateralibus<br />
interne fovea impressa; d. 1. posteriore v. sin. triangulari<br />
compresso; pone ligamentum sito; d. lunulari v. s. conico,<br />
dentibus cardinalibus aproximato. Dentium cardinalium 2<br />
anterioribus v. s. et 2 posterioribus v. d. bifldis, dente card,<br />
posteriore v. s. lineari, v. d. obsoleto. Limbo augusto, nitido.<br />
Impressione nnisculari semihwan, posteriore rhomboidali, duplo<br />
majore. Colore albo, dentibus cardinalibus et- fundo cavitatis<br />
flavesceutibus. Epidermide nigrescente, antice radiis obsoletis.<br />
Long, too, lat. 120, diam. 74 mm.<br />
Hab. Galatea Eiver, Xicobar Islands.<br />
Genus BATISSA.<br />
Batissa, Gray, A. M.N. H. ser. 2, xi, 1853, p. 38.<br />
Cyprina, Cyclas, Bruguiere, Encycl. Meth. 1792.<br />
Cyrena, Lamarck, Anim. s. Vert. \, 1818, p. 553,<br />
Venus, Gray, in Wood, Index Test., Suppl. 1828, pi. 2, fig. 13:<br />
Deshayes, Cat. Brit. Mus. 1854, p. 219; Prime, Cat. Corbiculidse,<br />
1869-70, p. 138; Clessiii, in Martini & Chemnitz, Conch. Cab.<br />
1879, p. 206.<br />
TYPE, Batissa tenebrosa, Hinds, from the Fiji Islands.<br />
Range. Nicobar Islands ; Malay Archipelago ; '^. Australia and<br />
Tropical Islands of the Pacific.
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