454 PHILOSOPHY OF ZOOLOGY. 



2d Tribe. Cloak destitute of a shield. 

 In this tribe, the pulmonary cavity is situate near the 

 tail. 



A. Tail covered with a single spiral open shell. 



17. ,TESTACELLA. Pulmonary cavity underneath the 

 shell. 



The vent and pulmonary cavity are, from the position of 

 the protecting shell, on which they are dependent, nearly 

 terminal. The foot extends on each side beyond the body. 

 From the manner in which the blood is aerated, the auricle 

 and ventricle are placed longitudinally, the latter being an- 

 terior. 



This genus at present consists of three species. One of 

 these, T. Jialiotoideus, is a native of France and Spain. It 

 lives in the soil, and feeds on the earthworm. Another 

 species, the T. Maugei, was first observed at Teneriffe, by 

 M. MAUGE. It has been figured in the splendid work on 

 the Mollusca, by FERRUSSAC, already referred to, Tab. vii. 

 f. 10 12, from specimens found in the botanical garden of 

 Bristol, and communicated by Dr LEACH. It has been 

 conjectured, that the British examples may have been intro- 

 duced along with plants from Teneriffe. The third spe- 

 cies, T. Ambiguus, is established on the doubtful authority 

 of a shell, in the collection of M. LAMARK. 



B. Destitute of an external shell. 



18. VERONICELLUS. Cloak fortified posteriorly by an 

 internal shelly plate. Tentacula four. 



This genus was instituted by M. BLAINVILLE, for the 

 reception of the V. lavis, established from a specimen pre- 

 served in spirits, belonging to the British Museum, and 

 communicated by Dr LEACH. It is figured by FERRUSSAC, 

 Tab. vii. Fig. 6, 7. The body is somewhat pointed be- 

 fore, and rounded behind. The cloak is large ; the foot 

 rather narrow, and plaited on the edges. The opening to 



