50 HINNITES. 
reader with the principal variations to which the genus is 
subject. The established genera will be characterized in their 
places. Fig. 254 to 281. 
HEMICAR’DIUM. Cuv. (jyuovs, hemisus, half; Kapdsa, cardia, 
heart.) Carprum Hemicardium, fig. 123**, and several similar 
species. 
HEMICYCLOSTOM ATA. Bl. The fourth family of Asrpnont- 
BRANCHIATA, Bl. containing the genera Natica, Nerita, Neritina 
and Navicella. 
HEPTALASMIS. Leach, (Emra, hepta, seven; cdaspos, elasmos, 
plate.) A small shell resembling Pentelasmis, from which 
it differs in the number of valves, being composed of seven 
valves according to Leach, but of eight, according to Gray, 
who counts the dorsal valve, which is jointed, as two, and calls 
his genus, Octolasmis, fig. 41, H. Warwickii, 
HER’COLES. Montf. A microscopic shell, appearing from De 
Montfort’s figure to resemble TRocuvus Imperialis. 
HERION. Montf. Lenticuuima, Bl. microscopic. 
HERMAPHRODITA. BI. Third sub-class of Paracephalophora, 
Bl. Divided into, Sect. 1. symmetrical, containing the orders 
Cirrobranchiata and Cervicobranchiata; Sect. 2, non-symme- 
trical, order Scutibranchiata. 
HERMES. Montf. A genus composed of Conus Nussatella, Auct. 
and other elongated, cylindrical, striated species, fig. 460. 
HET’ EROBRANCHIA’TA. Bl. The fourth order of the class 
Acephalophora, Bl. containing no testaceous mollusca. 
HET’EROPODA. The fifth order. of the class Mollusca, Lam. 
This order contains but one genus of shells, viz. Carinaria, fig. 
488. 
HETEROSTEGINA. D’Orb. A genus of microscopic Forami- 
nifera. 
HIATEULA. Daud. Fam. Lithophages, Lam. A genus compo- 
sed of species of Saxicava, Auct. which have sharp, angulated 
posterior ridges; a circumstance which occurs to many species 
in a young state, which afterwards become rounded off. Fig. 
95, Hiatella Biaperta. 
HIA’TULA. Sw. A genus proposed to include those species of 
Oliva, Auct. which have widened apertures. Hz. O. Subulata, 
fig. 458. 
HI'BOLITHES. Montf. A genus composed of species of Belem- 
nites, Auct. which are swelled towards the apex, and contracted 
near the centre. B. Hastatus, Auct. fig. 468. 
HIMAN’TOPODA. Schum. Matueus, Auct. 
HINGE. The edge of bivalve shells, near the umbones, including 
the teeth and ligaments. 
HIN’NITES. Fer. A generic name proposed for PecrEn Pusio, 
Auct. remarkable for the irregularity of the outer surface, which 
