156 SOLENIDJE. 



by a lens. 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 excepting the narrower arcuated shell, 

 lesser size, and the oblique termination of the foot, it is the 

 prototype of the curved variety of S. siliqua. 



S. LEGUMEN, Linn, et nobis. 

 Ceratisolen legumen, Brit. Moll. i. p. 256, pi. 13. f. 2; (animal) pi. I. f 4. 



This animal is subcompressed, and in comparison with its 

 congeners only presents specialty-variations, the principal one 

 being 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. MARGIN ATUS, Pultcney. 

 S. marginatus, Brit. Moll. i. p. 242, pi. 14. f. 1 ; (animal) pi. I. f. 3. 



SOLENICURTUS, De Blainville. 

 S. COARCTATUS, Gmelui. 



S. coarctatus, Brit. Moll. i. p. 259, pi. 15. f. 3; (animal) pi. I. f. 5. 

 S. antiquatus, Auctorum. 



Animal oblong, reniform, subcompressed, white throughout. 

 Mantle closed, except anteriorly, for a large, thick, linguiform 

 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 branchiae 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 Solcns, but subject to some modifica- 



