42 TESTACEA. 



Now, however, the subject recovered on immersion in recent sea 

 water. It became vigorous and lively ; and having been commited to 

 the artist a second time, the drawings, commenced in June 1819, were 

 finished in May 1820. 



No remarkable features were disclosed by the habits or the history 

 of this specimen, longevi ty excepted. It survived eight years and eight 

 months in confinement. Its only food was the green fucus. 



Small testacea seem to suffer less than the larger, from renovation 

 of their native element being neglected. A small Turbo, of another 

 species, whose vessel had not been replenished during thirteen months, 

 testified no diminution of vigour when water was supplied to it. Inci- 

 dents are the result of accident, not of design. 



The Turbo might have lived longer ; but being incautiously commit- 

 ted to the same vessel as a small marine Planaria, I entertain no doubt 

 that its empty shell proved extraction of the contents by the other. 



PLATE VIII. 



FIG. 18. Turbo senior, natural size. 

 19. The same, enlarged. 



The Limacine tribes dwell in the rivers, in fresh and in salt waters. 

 They are numerous, and generally dispersed in most countries. 



HELIX PEREGER (PEREGRINUS.) Plate IX. Figs. 1-4. 



Modern nomenclature has so contracted the appellation of this com- 

 mon and well known animal, that ordinary linguists will be perplexed to 

 identify their specimens, without reference to figures. 



Length of the shell nine lines ; volutes four, the last disproportion- 

 ately large compared with the rest ; horn colour or wax-yellow ; animal 

 a limax ; sole broad ; anterior and posterior extremities obtuse ; head 

 broad, almost a semicircular flap ; with two short, triangular, flattened 

 tentacula ; and two black eyes almost at their internal base. Colour like 

 that of the shell, Plate IX. Figs. 1, 2. 



