TELLINIDA. 167 
The genus commenced in the cretaceous period, augmented 
during the tertiary, and is at its greatest development now. 
PSAMMOCOLA, Blainv., 1824. Shell oblong, subquadrangular ; 
surface smooth. G. maxima, Desh. (cxi, 47). 
AMPHICHENA, Philippi, 1847. (Psammobella, Gray, 1851.) 
Shell oblong, gaping at both extremities ; posterior end rounded. 
G. modesta, Desh. (exi, 48). 
HETEROGLYPTA, Martens, 1880. Posterior portion of the shell 
differently sculptured. G. squamosa, Lam. 
SANGUINOLARIA, Lamarck, 1799. 
Etym.—From the type, Solen sanguinolentus, Chemn. 
Syn.—Lobaria, Schum., 1817. 
Distr.—5 sp. S&S. rosea, Lam. (exi, 49>. Fossil; ? Paleozoic—. 
Shell transverse, subelliptical, flattened, equivalve, inequi- 
lateral, a little gaping at the ends, not angulate posteriorly, 
covered by a thin, fugacious epidermis; hinge having two small, 
unequal, divergent cardinal teeth in each valve, the anterior of 
the left valve and posterior of the right valve being the largest ; 
beaks small; ligament long; margins plain; muscular impres- 
sions subdorsal, the anterior oval, posterior circular; pallial 
impression elongated, with a shallow, narrow sinus. 
Hiatvuta, Modeer, 1793. 
Syn.—Soletellina, Blainv., 1824. 
Distr.—40 sp. W. Indies, Red Sea, India, Madagascar, Japan, 
Australia, Tasmania, Peru. Fossil, 30 sp. Hocene—; U. 8 
Europe. #H. diphos, Linn. (exi, 50). 
Valves oval-oblong, compressed, ventral margin usually 
incurved posteriorly, where the valves are attenuated ; broadly 
rounded anteriorly ; beaks submedian, not prominent; violaceous, 
under an olive epidermis; ligament thick, swollen; one or two 
very small cardinal teeth in each valve ; muscular impressions 
rounded, distant; pallial impression very sinuous. 
PSAMMOTMA, Lam., 1818. Posterior slope a little angulated, 
but not rostrated. H. violacea, Lam. (cxi, 51). 
PSAMMOTELLA, Blainv., 1826. Shell thin, oval or oblong, pos- 
terior edge rounded. JH. elongata, Lam. (cxi, 52). 
| 
Evizia, Gray, 1852. 
Distr.—2 sp. East Indies. £. orbiculata, Wood (exi, 53, 54). 
Shell suborbicular, equivalve, thin, compressed, covered by a 
shining epidermis; beaks not prominent, subanterior; hinge 
with two oblique cardinal teeth in the right valve, one of which 
is elongated and bifid, and three teeth in the left valve, the cen- 
tral one bifid; pallial impression submarginal. 
