137 
exhibits two specimens, the largest appears to be distorted 
laterally, for the septa at the lower end are turned to one 
side. It is composed chiefly of Iron Pyrites covered with 
the pearly remains of ihe shell; its small weight, and the 
cavity at the upper end, lead me to think that the chambers 
are left hollow; the other is quite regular. By an attentive 
examination of the specimen the siphunculus may be traced. 
Fig. 3 shows a compressed cast in Oxyde of Iron (probably 
this was Pyrites once). I add it for the purpose of exhibit- 
ing the gradual curvature, but with some hesitation, as the 
specimen is too bad to ascertain with certainty that it belongs 
to this species. 
HAMITES attenuatus. 
TAB. LXIl.—Figs. 4 and 5. 
Serc. Cuar. Slightly compressed, suddenly attenu- 
ated just below the curve; undulations obtuse, 
numerous. 
Se EL 
Tur larger limb is suddenly contracted near where it turns 
into the smaller, which’ consequently is more slender in 
proportion, and is round; the undulations are obscure at 
the back. The specimens here represented are excellent 
for exhibiting the Generic character, in consequence of the 
length of the lesser limbs, which are rarely found. — 
Fig. 4 is cast in dark Iron Pyrites, with the pearly septa 
remaining. In the engraving the undulations are not quite 
near enough, particularly on the lesser limb. Fig. 5 is an 
impression in Clay of a larger shell, perhaps of the same 
species; it appears to haye been Pyrites, and dissolved. 
