191 
V. acuticosta differs from the preceding chiefly in having its ribs some- 
what carinated ; Lamarck, indeed, suspects it to be merely a variety. 
V. senilis. Lam. is a thick obliquely cordated shell, about an inch 
and a half in length, with large convex, rather imbricated, but not 
rough, ribs. The specimen possessed by Lamarck, he believes, was 
obtained from Courtagnon . It is frequently found among the Harwich 
shells, and in very good preservation. Its thick valves, with large 
smooth ribs, give to it a very antiquated appearance. The outer and 
inner side of one of these shells are figured Plate XIII. Fig. 15 and 17. 
Lamarck particularizes two more species, V. multicostata, V. pedun- 
cular is ; besides four more, V. cor avium, V. squamosa, V. decussata, 
and V. elegans ; in which only one hinge -tooth is apparent in one 
valve, and which is received by two corresponding but diverging 
teeth in the opposite valve. 
CXIX. Lucina. A round, or ovato-transverse equivalved bivalve, 
with the beaks bowed backwards. The hinge-teeth, one or two, 
variable ; the lateral teeth one or two, and sometimes hardly any. 
These shells differ fromYenus’s, in having lateral teeth; fromTellens, 
in having no fold ; and from Cyclades, in not having three hinge-teeth. 
Lamarck reckons twelve species as found in the neighbourhood of Paris : 
L. lamellosa, L. concentrica, L. circinaria, L. saxorum, L. divaricata, L. 
gibbosula, L. renulata, L. albella, L. sulcata , L. squamosa, L. undulata , 
L. complanata. 
This genus was instituted by Bruguiere for the reception of those 
shells which, with only one or two cardinal, had one or two lateral 
remote teeth, which in some species were hardly apparent. Tellina 
pectinata, Linn. Conch. Listeri, PI. 300, Fig. 137, i s owe of this genus. 
V. fimbriata, Linn. V. Pensylvanica, Linn, with T. lactea, Linn, and 
T. divaricata, have been also placed in this genus. 
A small shell, resembling V. gallina, found among the Harwich 
fossils, seems to have the characters of this genus. 
CXX. Tellina. An orbicular, or ovato-transverse equivalved bi- 
