APPENDIX. 265 



Vol. iii. p. 131. Rissoa soluta. 



This species has been taken alive by Mr. Clark in fourteen 

 fathoms water, off Budleigh Salterton, Devon. The animal is 

 hyaline white, except the small eye bulgings, which are pale 

 sulphur yellow, and the black eyes. The tentacula are mode- 

 rately long, rounded at the tips, very pilose, the setae springing 

 from them horizontally, but are only visible with high powers. 

 The foot is subtruncate, slightly auricled, and long and narrow. 

 No caudal cirrhus was detected. The operculum is suborbicular, 

 and attached near the extremitv of the foot. 



Vol. iii. p. 132. Rissoa? littorea. 



In our description of this rare shell we expressed our doubts 

 respecting its true generic position, and quoted, in illustration, the 

 account of the animal of the Truncatella littorina of Philippi, the 

 type of the genus Paludinella, of L. Pfeiffer. In the " Annals 

 of Natural History," for November, 1852, is a short notice by 

 Messrs. H. and A. Adams, in which a new arrangement of the 

 British Rissoae is proposed, one that seems to us based on a mis- 

 conception of the value of the characters adduced, and of the pur- 

 pose of generic appellations. In this paper is the only published 

 notice of the animal of the British Rissoa littorea, for which the 

 genus Paludinella of Pfeiffer is retained, although the account of 

 the position of the eyes, and the statement that there is no oper- 

 cular lobe (from which we should infer the absence of an oper- 

 culum), is in discordance with the characters noticed by Philippi, 

 and cited by Pfeiffer, as distinctive of his proposed genus. 



We have lately (November, 1852), taken a number of living- 

 specimens ; and, after an examination of them, have come to a 

 somewhat different result. The animal is fleshy and bulky for its 

 size, entirely white and translucent,, except the black eyes and a 

 tinge of tawny on the muzzle, caused by the presence within of 

 the armature of the mouth. The head is of moderate size, and 

 provided with a very large, broad, and somewhat bilobed muzzle 

 vertically cloven beneath. The tentacles are rather short, stout, 

 linear, obtuse at their tips, a little below which they bear the con- 



VOL. IV. M M 



