156 SOLENIDAL. 
by alens. The liver forms the same granular brown masses, 
connected anteally towards the lower part of the body with 
the ovary. The crystalline stylet or attritor is present. 
We may state, that exceptmg the narrower arcuated shell, 
lesser size, and the oblique termination of the foot, it is the 
prototype of the curved variety of S. saliqua. 
S. tecumMeEN, Linn. et nobis. 
Ceratisolen legumen, Brit. Moll. 1. p. 256, pl. 13. f. 2; (animal) pl. I. f. 4. 
This animal is subcompressed, and in comparison with its 
congeners only presents specialty-variations, the principal one 
bemg the greater extension, separation and divergency of the 
siphons. We do not see any sufficient character to remove 
this species from Solen. 
The undermentioned species, though occasionally taken 
alive at Exmouth, has not occurred to us. 
S. marcinatus, Pulteney. 
S. marginatus, Brit. Moll. 1. p. 242, pl. 14. f. 1; (animal) pl. I. f. 3. 
SOLENICURTUS, De Blainville. 
S. coarctatus, Gmelin. 
S. coarctatus, Brit. Moll. i. p. 259, pl. 15. f. 3; (animal) pl. I. f. 5. 
S. antiquatus, Auctorum. 
Animal oblong, reniform, subcompressed, white throughout. 
Mantle closed, except anteriorly, for a large, thick, limgwiform 
foot, and posteally it forms a common sheath, from which the 
siphons spring ; the branchial tube is only cirrhated at the ori- 
fice, and the animal often inflates both to three times the ordi- 
nary diameter. The branchiz are a pair on each side, long, 
narrow, attenuating posteriorly, and, as in the Pholades, are 
partly deposited in the branchial department of the siphonal 
sheath; the corresponding pairs of palpi are long, slender, 
triangular, well-pectinated within, and less so on the outside. 
There is no byssal groove in the foot. This species has the 
greatest analogy to the Solens, but subject to some modifica- 
