ASSIMINIA. 23 



Nerita Syncera hepatica. Gray, Med. Repos. 1821, p. 239. 

 Assiminia Grayana, Leach, MS. 1816; flem. B.A. 275.; 

 Berkeley, Zool Journ. v. 429. t. 19. f. 4. ; Leach, Syn. Moll 

 155. t. 9. f. 4. 5.; Gray, Ann. and Mag. N. H. xvi. 183. 

 422, xviii. 49. ; Forbes and Hanley, B.M. Hi. 70. t. 71. f. 3, 

 4. t. H. H. f. 6.; Clark, Ann. and Mag. N. H., xvi. 114. 272. 

 1855, xvii. 57. 1856. Lymneus Grayanus. Jeffreys, Linn. 

 Trans, xvi. 378. Paludina Grayana. Potiez and Mich, 

 Gal. i. 251.t.25. f. 23, 24. 



Inhab. the mouths of rivers, and small streams 

 connected with them, seldom out of the reach of 

 brackish water. 



Foot broadly obovate, obtuse, compressed, evi- 

 Fig. 3. dently of two distinct laminae, the lower 

 projecting beyond the upper, and sepa- 

 rated from it by an accurately denned 

 line ; above fuscous, beneath olivaceous, 

 shaded with cinereous ; tentacles very 

 short and obtuse, fuscous, eyes at their 

 tips ; muzzle porrect, not truly probos- 

 cidiform. deeply notched in front, fus- 



Assimmia. i 



a and c, head. cous > strongly annulated ; the edge ot 

 the lips paler : on each side is a groove 

 running backwards from the base of the tentacula. 



Shell about inch long, ovate, solid, bright, 

 shining, liver-brown, with a conical spire, and slightly 

 impressed suture. The axis is imperforated. Oper- 

 culum horny, ovate, black-brown. 



Very like the small LittorincB, but more solid, and 

 differs in the animal ; it is curious that so abundant 

 a shell should have been overlooked by Montagu 

 and his correspondents. 



There may be noticed two marine species, some- 

 times found with the former. 



c 4 



