JUKES-BEOWNE : SYNOPSIS OF THE TENEKID^. &7 



only three species belong to this section, viz. C. corrugnta, Chera., 

 C. crocea, Gray, and C. intermedia, live. All of these live on the 

 Arabian coasts from the Red Sea to the (Julf of Oman, and crocea 

 ran<;es down the African coasts as far as Zanzibar, but I cannot 

 learn that any of them have been recorded from India. 



Suh-gcnera. 



Crista, Romer, 1847. Type, Venus pectinata, Linnaeus. 



Synonyms: Faphia, Oken, 1815 (not Lam.); Gafrarium, Dall 

 after Bolten. 



Shell not flattened at tlie iimbones, convex or compressed, with 

 radial and concentric sculpture, the radials divaricate. Escutcheon 

 narrow and impiessed, and the ligament sunken. Hinge-plate short 

 and triangular. In the left valve the median cardinal is grooved, 

 and the j)i)sterior is short. The margins of the valves are generally 

 but not always crenulated. This group includes C. gibhia. Lam., 

 C. divaricata, Chem., C. mquivoca, Chem., C. dispar, Chem., C. euneata, 

 Lam., C. australis, Sow., and C. trannversaria, Desli. Typical dispar 

 has smooth margins, wliile those of cimeata are crenulate ; similarly, 

 those of transversaria are smooth and of (squivoca, which it much 

 resembles, are crenulate. 



Circenita, Jousseaume, 1888. Type, Circe arabica, Chem. 



Shell oval, convex, concentrically ribbed or striated, and without 

 radial sculpture. Escutcheon not defined, and ligament exposed. 

 Cardinal teeth small, near together, and entire; the anterior laterals 

 comparatively large. Ventral margins always smooth. Pallial line 

 slightly sinuated. This is a very small group, including only three 

 well-marked species, viz. arahica, Chem., lentiginosa, Chem., and 

 callipyga, Born, but several varieties have been given names, such as 

 adenensis, Phil., pulchra, Desh., spkndens, Sow., semiarata, Dkr., and 

 fimicuJata, Riimer. 



Gouldia, C. B. Adams, 1847. Type, Circe cerina, Adams. 



Shell rather small, oval, convex, with dominant concentric sculpture, 

 but sometimes liaving fine radial striation at the sides. Escutcheon 

 not defined. Teeth more widely divergent ; liglit posterior cardinal 

 grooved, but the rest entire. Posterior dorsal margins of both valves 

 strongly grooved, each generally having a ridge and a groove. 

 Ventral margins smooth or irregularly rugose (not crenulate). Pallial 

 line slightly inflected. Pedal scar confluent with that of the adductor. 

 This group includes C. minima, Mont. (Atlantic and Mediterranean), 

 C. bermudensis. Smith (Bermuda and West Indies), C. sulcata, Gray 

 (Red Sea to Philippines and Fiji), C. nana, Melv. (Persian Gulf to 

 Siara), C. mehilli, Lynge (Siam), and C. arnica, Smith (Pacific 

 Islands). 



Meretrissa, Jukes-Browne, 1908. Type, Tivelina depressa, Desh. 

 (fossil). 



In 1908 I separated two species of small shells occurring in the 

 Oligocene of the Paris Basin under the name of Meretrissa, and 

 regarded them as a link between Tivelina and Meretrix. More recent 

 scrutiny of the specimens then sent me by M. Cossmann, and the 



