ACLESIA. 35 



Shell internal, thin, ovate, nearly membranaceous ; 

 apex acute. 



Syn. Aplysia sp. Rang. Siphonotus, Adams and 

 Reeve, not Brandt. 



Ex. S. geographica, Adams and Reeve, pi. 50, fig. 6. 



Occasionally, and especially during low-water, the species 

 of Syplionola bury themselves in the mud on shallow 

 shores ; some species, however, are met with at a con- 

 siderable distance from land, among floating algie. 



Species of Syphonota. 



fasciata, Poiret. lurida, B'Orh. 



geographica, Adams and ruaculata, Rang. 

 Reeve. ocellata, D'Orb. 



Keraudrenii, Rang. 



Genus ACLESIA, Hang. 



Body oval, pointed behind, covered with digitated ap- 

 pendages ; gills included within the branchial cavity. 

 Anal orifice simple. 



Shell none. 



Syn. Aclesie, Rang. Thallepus, Swains. 



Ex. A. Pleii, Rang, pi. 59, fig. 7. 



Aclesia differs from Aplysia in the entire absence of 

 shell, in the lobes of the foot being less developed, and in 

 the body being usually beset with numerous, branched, 

 tentacular appendages. 



Species of Aclesia. 



cirrigera, Quoy. rufa, Qnoy. 



citrina, Rany. striata, Quoy. 



euchlora, A. Adams. viridis, Bang. 



ocellata, A. Adams. undata, Rang. 

 Pleii, Rang, 



