SOLENID. 131 
Sorenopsis, M’Ooy, 1844. 
Distr. —S. minor, M’Coy (ev, 85). Carboniferous; Ireland. 
Shell like Solen, but somewhat thicker anteriorly, and with 
inflated beaks ; posterior end truncate. 
This genus has been proposed for the reception of some pale- 
ozoic species, formerly described as Solen, like S. pelagicus and 
vetustus of Goldfuss, S. siliquoides, Kon., and others. The gen- 
eral form of these shells is very much like that of elongated 
species of Sphenia; the hinge-teeth, if any, are not as yet known, 
and it is therefore, strictly speaking, impossible to classify the 
genus correctly ; D’Orbigny identifies it with Lyonsia. 
SoLEeNARIA, Stoliczka, 1870. 
Distr.—S. affinis, Eichw. Turonian; Russia. 
Shell thin, narrow, long and straight, like a Solen, internally 
with two radiating, diverging ribs, originating at the beaks and 
proceeding towards the ventral edge. The hinge is as yet 
unknown, but the general form of the shell agrees entirely with 
Solen. 
CULTELLUS, Schumacher, 1817. 
Etym.— Cultellus, a knife. 
Distr.—12 sp. Africa, India, Nicobar, Philippines. Fossil ; 
Tertiary. C. cultellus, Linn. (evi, 10, 11). 
Shell elongated, compressed, rounded and gaping at the ends; 
hinge-teeth 2°3; beaks in front of the centre, supported inter. 
nally by an oblique rib; pedal impression behind the umbonal 
rib; posterior adductor trigonal; pallial line not prolonged 
behind the posterior adductor; sinus short and square. 
Animal (of C. Javanicus) with short, fringed siphons; gills 
narrow, half as long as the shell, transversely plaited ; palpi 
large, angular, broadly attached ; foot large, abruptly truncated. 
ENSICULUS, H. and A. Ad. Proposed for the old Solen cultellus, 
Linn. , differing from the other species of Cultellus by its more 
elongated, curved and parallel form, and the short, oblique ribs 
below the umbones. 
Susramity PHARELLINZ. 
Siphons elongated, separated for half their length. Shell 
transverse, elongated, gaping and rounded at the extremities ; 
umbones subcentral, instead of terminal as in Solenine; hinge- 
teeth varying, usually three in one valve, two in the other ; 
pallial impression with a profound, rounded sinus. 
PHARELLA, Gray, 1854. 
Distr.—4 sp. India, East Indies. Fossil. Cretaceous; India, 
N. America. P. Javanica, Lam. (ev, 86). 
