GLAUCUS. CARHXARIA. 



the back, and in which the mouth is 

 armed with lateral horny jaws, similar 

 to shears; *,he GLAUCUS, remarkable 

 for its blue colour (Jig. 85), in which ;."- 

 the branchiae, three pairs in number, 

 are situated in the same manner, but 

 each one is composed of several long 

 fringes, spread like a fan ; and the 

 EOLIDIJE (Jig- 84), which resemble 

 small Limaces in form, in which the 

 branchiae are composed of laminae, or 

 leaflets, arranged like scales, more or 

 less crowded together on each side 

 of the back. They are found in 

 every sea. 



Fig. 85. GLAUCUS. 



ORDER OF GASTEROPODA HETEROFODA. 



43. These gasteropods are not organized, like all the pre- 

 ceding, for crawling on the belly, but for swimming only. In 

 fact, their foot, in place of forming a horizontal fleshy disk, is 

 compressed into a vertical membranous plate, which is used as a 

 fin. Their body is formed of a transparent, gelatinous sub- 

 stance, and their branchiaa are placed on the posterior part of the 

 back. 



The principal genera of this group are the CAB^NARIA and 



FlOROLA. 



ye br c 



p v 



Fig. 86. CARINARIA MEDITERKANKA. 



Explanation of Fig. 8G. 1>. the mouth ; t. the tentacles ; y. the eyes ; 

 <?. the diomach ; /. the liver ; c. the shell ; br. the branchiae ; p. the foot; 

 . a small sucker situate on the side of the foot. 



43. Wnat are the cnaracters of the Heteropo'da ? (Heteropoda ; from the 

 Grrek, eferos, various, and pous, foot.) 



