t^^l

1.28 soLEifiDj;.
inferiorem (interiorem) tegens, ijiferior crassior, prope dentem
lateralem anticum, haud curvatus, altior exteriore; dextree
siiiguli; paulum curvati, parte sinistra ascendente tenues, parte
dextra desceudente incrassati; dentes laterales in valva sinistra
biui, erecti, antice triangulati; postiee uncinati, valva dextra bini
postici et bini antici, biui exteriores (non semper exstantes)
minimi; interiores longi, triangulati. antice erassiores.
Affinis Pis. scJiolizii, Clessin*, differt forma dentium cardin.
valvffi sinistrse, situ dentium cardinalium, minore profund.
Ifab. Lake Walar, Kashmir.
The author appears to have only been able to see two perfect
specimens which were both very young, he therefore gives the
following measurements taken from a series of single valves :—
1. 2. 3. 4. 5. 6.
„. r Long. . . 3 3 3 2-7 2-6 — mm.
T?- 1+V 1 \ ^"'^- •• 3-5 3 3-2 3 2-9 3-4 mm.
Eight Valves. I-pj,^^_ 1 1 1 1 1 M mm.
1. 2. 3.
(Long. . .
Three
i Lat. ..
Left Valves. 1 i(^'- ' '
[Diam...
2-7
3
?
1
3
3-1
? |
1-1
2-4 mm.
2-8
f« '""'•
1 m 11).
The proportion between length and breadth is therefor© 3-1
to 2-8.
Family SOLENID.-E.
Subfamily SOLENINiB.
Shell equivalve, transversely elongate, more or less gaping at
each end, covered with a periostracum ; umbones not prominent;
ligament external, on an elongate ridge; hinge very variable,
bearing fr^m one to three cardinal teeth on each valve; lateral
teeth wanting; adductor scars in both valves distant; pallial
impression posteriorly more or less sinuous, pedal impressions
well marked beneath the umbones or near the dorsal margin;
external surface of the siiell presenting a well-defined cellular
structure, consisting of long prisihs, very oblique iii relation to
the surface and showing the presence of nuclei; internal surface
nearly homogeneous; non-nacreous.
Animal, with the exception of Nouaculina, marine or estuarine ;
siphons usually short, in part united or entirely separate ; foot
large, powerful, more or less cylindrical, elongated; without any
trace of byssogenous organs ; palpes variable in size ; gills straight,
unequal, lengthened and enclosed in the branchial siphon.
m. AVorld-wide.
* P. sclwUzii, Clessin=P. ohttisale.