102 
MOLLUSCA. 
teeth* * * § , and others, wliich, with the hinge of the Tellinae, have not 
the plica of the posterior extremity — they are the Tellinides, 
Lam.f 
It is necessary to distinguish from the Tellinae, the 
Loripes. Poli, 
In which the middle teeth of the lenticular shell are almost effaced, 
and where there is a simple sulcus for the ligament behind the nates. 
The animal is furnished with a short double tube, and its foot is pro- 
longed into a kind of cylindrical cord. Besides the usual impres- 
sions, we may observe, on the inside of the shell, a line running ob- 
liquely from the print of the anterior muscle, which is very long, 
towards the nates. There is no flexure in the print of the mantle for 
the retractor muscle of the tube ;j;. 
Lucina, Brug. 
Separated lateral teeth, as in the Cardia, Cyclades, &c., that pene- 
trate between the plates of the other valve ; in the middle are two 
teeth, frequently, but slightly apparent. The shell is orbicular, and 
without any impression of the retractor muscle of the tube ; that of 
the anterior constrictor, however, is very long. Possessing similar 
traits of character with the Loripedes, their animals must be analo- 
gous §. 
The living species are much less numerous than those that are 
fossil; the latter are very common in the environs of Paris ||. 
We should approximate to the Lucinse, the UngulinjEA, which also 
have an orbicular shell and two cardinal teeth ; the lateral ones, how- 
ever, are Avanting, and the anterior muscular impression is not so 
long The genus 
Venus, Lin. 
Comprises many Testacea whose general character consists in the 
teeth and plates of the hinge being approximated under the summit, 
in a single group. They are usually more flattened and elongated, in 
a direction parallel to the hinge, than the Cardia. The ribs, when 
there are any, are almost always parallel to the edges, being directly 
the reverse of their arrangement in the Cardia. 
The ligament frequently leaves an elliptical impression behind the 
summits, which has received the appellation of vulva, and before 
* Tell, hyalina, Chemn., VI, xi, 99 ; — Tell vitrea, Ib., 101. 
-f- Tellinides timorensis, Lam. 
J Tellina lactea. 
§ Venus pennsylmnica, Chemn, VII, xxxvii, 394 — 396, xxxix, 408, 409 ; — V. 
cdentula, Id., xl, 427, 429. 
II Lucina saxorurn, Lam., Deshayes, Coq. Foss, des Env. de Paris, I, pi. xv., f. 5, 
6 ; — Luc. grata, Defr. ; Ibid. pi. xvi, f. 5, 6 ; — Luc. concentrica, Lam., Desh., Ib., 
xvi., f. 1 1, 12. 
^ Ungulina fransversa, Kam., Sowerb., Gen. of Shells, No. X. 
