224 



Velutina otis. Fleming, B. A. 326. Helix otis. Turton, 

 Conch. Diet. 70. Galericulum otis, and G. ovulum. Bnwn, 

 III. Conch. Otina otis. Gran, B. Z. Soc. 1848; Clark, 

 Ann. and Mag. N. H. vi. 24. ; Forbes and Hanley, B. M. iii. 

 321. t. 99. f. 2, 3.; Pfeiffer, Moc. Aur. 12. 



Rocks on sea-coast. " These animals are generally 

 found at the roots of Lichina pygmcea on the rocks, 

 often in company with Lasea rubra. When they are 

 placed in water, they generally make their way out 

 and fix themselves to some dry spot, as is the case 

 with many Littorina, which almost always con- 

 stantly live in free air." Clark. 



* Tentacles elongate, linear ; jaw single, angular 

 (fig. 54.); body and shell ovate, spiral, 

 sinistral. (Physina.) 



6. PHYSA. (Bubble Shell.) 



The body spiral, on the middle of an elongate foot ; 

 p^ 54> the mantle large, lobed 



on the edge, and ex- 

 panded over the ovate, 

 thin, transparent, spiral, 

 sinistral shell, which has 

 an oblong mouth, with 

 Physa fontinalis. the inner lip expanded 



and spread over the body whorl, covering it 

 and the smooth pillar ; the tentacles have an 

 auricle at the base. 



The tongue has a multitude of teeth of a simi- 

 lar form, though different from any that I have seen 

 in other genera; but the delicacy of the tongue 



