SUPPLEMENT. 205 



of yellowish-brown on the top of the spire : epidermis none, 

 perhaps abraded: spire turreted, ending in an abrupt and 

 truncated top : whorls 5, convex and rounded, gradually en- 

 larging : suture deeply excavated : mouth more circular than 

 oval, somewhat expanded and angulated at the base : outer lip 

 thin, incurved towards the periphery: inner lip filmy and 

 scarcely visible : pillar curved : canal narrow. L. 0-125. 

 B. 0-075. 



HABITAT: N. of Hebr., in 189 and 650 f. (C. and T.). A 

 very few immature specimens, and one full-sized but broken. 

 May be distinguished from all known species of Lacuna by its 

 much smaller size, delicate texture, glossy appearance, turreted 

 spire, truncated apex, deeply excavated suture, and the ab- 

 sence of regular and impressed spiral striae. Its shape re- 

 sembles that of Bithynia Leachii. 



P. 348. L. PTTTEOLTJS. Eoach river, Essex, and west coast 

 of Shetland (J. G. J.) ; Orkneys (Thomas)! ; N. of Hebr., 530 f., 

 dead (C. and T.). F. Selsea and Portrush (A. Bell) ! 



P. 351. L. PALLLDTJLA. E. Portrush (A. Bell) ! Scan- 

 dinavia (Bars and Thuden). E. Norway, shore-10 f. (Sars) ; 

 Arcachon (Fischer) ! Yar. patula. Lantivet Bay, Cornwall 

 (Laughrin) ! 



P. 356. LITTORINA OBTTJSATA. E. Several additional 

 localities in England and Ireland. E. Atlantic coasts of 

 Prance and Spain, Malaga, Corsica, and Azores ! Yar. cestuarii 

 (figured as L. cestuarii) : 



BODY pale yellowish, with narrow streaks of brown in front 

 and at the sides : snout greyish, thick, extensile : tentacles 

 rather long, nearly cylindrical, annulated, with sometimes a 

 dark grey line down the middle in front : eyes small, black, 

 placed on oval tubercles or offsets at the outer base of the 

 tentacles : foot short, white underneath : liver whitish : fceces 

 oval, brownish-yellow. Not viviparous. 



SHELL smaller than the typical form, uniform greenish- 

 brown (the colour being more or less obscured by the excoria- 

 tion or decay of the surface) ; spire more raised and compact; 

 mouth more contracted, outer lip not expanding ; sculpture 

 slight and indistinct except in the young. L. 0-4. B. 0-3. 



Abundant between tide -marks, on the banks of the river 

 Deben at Shottisham Creek near Sutton, and at Manningtree, 



