ACEi’HALA TESTACEA. lOl 
a plate, and under the teeth a large cavity, which receivea a i»art of 
the ligament* * * § . 
Galathaja, Brug. 
The shell triangular; three teeth on the summit of one valve, and 
two on the other, en chevron ; the lateral plates approximatedf. 
But a single species is known ; it inhabits the fresh waters of 
the East Indies. 
It is here also that must be placed another genus separated from 
Venus, the 
CoKRIS, CuV. I’lMRRIA, MegCl'l. 
Marine testaceous Acephala, transversely oblong, which have also 
stout middle teeth, and well marked lateral plates ; their external 
surface is furnished with transverse ribs so regularly crossed by rays, 
that it may be compared to wicker-work. 
The impression of their mantle exhibiting no flexure, their tubes 
must be short X- 
Some of them are fossil §. In the 
Tellina, Lin. 
There are in the middle, one tooth on the left and two teeth on the 
right, frequently forked, at some distance before and behind, -on the 
right valve, a plate, which does not jjenetrate into a cavity of the 
opposite one. There is a slight plica near the posterior extremity of 
the two valves, which renders them unequal in that part, where tliey 
are somewhat open. 
The animal of the Tellinse — PERON.EA,Poli, — like that of the Dona- 
ces, has two long tubes for respiration and for the anus, which with- 
draw into the shell, and are concealed in a duplicature of the mantle. 
Their shells are generally transversely striated, and decorated 
with beautiful colours. 
Some of them are oval and thick. 
Others are oblong and strongly compressed. 
Some again are lenticular, where, instead of a plica, there is fre- 
quently nothing but a slight deviation of the transverse striae ||. 
^V^e miglit separate certain oblong species which have no lateral 
* Fenus island ica, Cheinn., YI, xxxii, 342, Encj'c. pi. 301, f. 1 ; a large fossil 
species is found in the hills of Sieniiois and nearDax, of Bourdeaux. 
■f' The Egeria, Roiss., or Galathcca, Brug., Encyc. 249, and Lam., Ann. du Mus., 
V, xxviii, and Venus hermaphrodita, Chemn., YI, xxxi, 327 — 329 ? or Venus sub - 
viridis, Gm. 
X Venus Jimbriafa, Chemn., YII, 43, 448. 
§ See Deshayes, Coq. Fo.ss. des Envir. de Paris, I. xiv ; Brongn., M^m. sur le 
Yicentur. 
II These are the three divisions of Ginelin, but we must abstract from his genus 
Tellina: 1st. Tell. Knorrii, which is a polished Capsa ; 2d. Tell, ina’quivalvis, which 
is the genus Pandora; 3d. Tell, cornea; T. lacuslris; T. amnica; T. fiuminalis ; 
T. Jluminea ; T. fluvialilis, which are Cyclades or Cyrena;. 
