ASSIMINIA. 
23 
Nerita Syncera liepatica. Gray^ Med. Repos. 1821, p. 239. — 
Assiminia Grayana, 1816 ; Hem. B.A. 275.; 
Berlieley^ 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. iii. 70. t. 71. f. 3, 
4. t. H. H. f. 6.; Clark^ Ann. and Mag. N. Zf., 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. 
Assiminia. 
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 lamina?, the lower 
^ projecting beyond the upper, and sepa- 
rated from it by an accurately defined 
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- 
a and c, head. strongly annulated ; the edge of 
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 LittoriurB^ 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. 
