74 THE MOUTH. 



of the mantle-integument was much more distinct 

 than in health ; it was seen to form a delicate lace- 

 work of yellow fibres all over the surface, covering 

 and inclosing a pellucid parenchyma. 



The animal evidently had been injured by its bath 

 of fresh water ; for it lay on its back, expanding and 

 contracting its various parts, without the power 

 of turning over to crawl, or even of adhering by the 

 foot when turned, but rolling helplessly back. The 

 form and appearance too were very different from 

 those of health, the sulcus being widely exposed by 

 the contraction of the mantle, much like the figure in 

 Prof. Jones' 'Animal Kingdom,' which I should think 

 was taken froi5 a specimen in spirit; it does not 

 much resemble mine in health. 



Kunning along near the edge of the foot, parallel 

 with it, on the upper surface, is a narrow projecting 

 lip or ledge, more opaque than the surrounding parts, 

 and capable of being slightly raised. Between, this 

 and the oral veil is the mouth, from which in my 

 sick specimen was projected a large pear-shaped or 

 vase-shaped body, of which the narrow part, which 

 was outward, was wrinkled up, and showed at times a 

 small central orifice, triangular in form. The body 

 was pellucid with an opaque central nucleus. 



The oral veil is thick, and is deeply grooved 

 along each outer edge : the margins of these grooves, 

 being infolded, make the oral tentacles. Fig. 6 repre- 

 sents the outer side of the left dorsal tentacle ; show- 

 ing a sinuosity in the edge of the cleft ; probably acci- 

 dental, since I did not observe it in the other tentacle. 



After death the form of the shell could very dis- 



