SOLEN. 155 
cylindrical than in S. siliqua, thus affording a sufficient pedal 
entry for the water, and is without the central fringed fissure 
of S. siliqua and S, ensis; it is attached to the body about 
the middle of the shell, being obliquely truncate, and can, 
like its congeners, assume the pointed, lanceolate, or club- 
shaped terminus; the colour is that of a pale morello cherry, 
of paler and intenser hues. 
The animal is capable of the most rapid locomotion ; I have 
seen it dart in a large dish with the velocity of the Pectines. 
It lives, as the S. siliqgua, in a perpendicular hole, and, like it, 
uses its powers of locomotion to change its habitat. 
There are, ou each side, a pair of pale drab, long, linear 
branchiz, the upper not half the depth of the lower one, and 
after leaving the body, they run, fixed on the long dorsal 
range of the mantle, and then unite and enter the short 
branchial siphon. There are also, on each side, a pair of 
small darkish-drab triangular palpi, smooth on the outer 
surface, and pectinated within. The liver is quite on the 
dorsal line, green; and below it, in close connection, is the 
ovary, filled at this season (22nd July) with round, flake- 
white ova. The stylet and tricuspid membrane or stomachal 
attritor are present. The connecting strap-shaped labia of 
the palpi around the mouth are as m S. siliqua. 
S. ensis, Linneeus et Auct. 
S. ensis, Brit. Moll. 1. p. 250, pl. 14. f. 2. 
Animal elongated, subcompressed, that is, less cylindrical 
than in S. stliqua, but more so than in S. pellucidus; the 
mantle is open at both ends, and has the fringed central 
fissure, with the same character of the tubes, cirrhi, and 
colours, as in S. si/iqua. The branchize, labia, and palpi are 
proportionately the same; the foot, though less cylindrical, 
is capable of the same changes of form, but instead of bemg 
at the termination truncate and rectangular, it forms an 
oblique sweep ; and the colour at its extremity, in leu of bemg 
pale cloudy-white, 1s studded with very minute papille, and 
meandering red-brown lines in the interstices, only to be seen 
