82 limapontiid^e. 



luscan type appears to be at the lowest stage of development, 

 and to represent the Planarm among the Annelids. 



Genus LIMAPONTIA, Johnston. 



Body depressed, without lateral ridges. Head elevated at 

 the sides into two crest- like ridges; eyes large, sessile on the 

 back of the head, in the centre of pale circular spaces. 

 Mantle distinct. 



Syn. Pontolimax, Crejrfin. Chalidis, Quatref. Niobe, 

 Girard. 



Ex. L. limacina, 0. Fabricius, pi. G7, fig. 8. 



The sides of the body rather overhang the foot ; the eyes 

 are large, at the posterior extremity of the crests, within 

 a pale space ; the animals are gregarious, feeding on con- 

 fervas in small pools above half-tide. 



Species of Limapontia. 

 cserulea, Quatref. limacina, 0. Fabr. 



Genus ACTEONIA, Quatrefages. 



Body with a slightly-elevated ridge on each side. Head 

 carinated at the sides, each carina produced above into a 

 short, flat, ear-like, tentacular process, behind which are the 

 eyes. 



Ex. A. corrugata, Alder and Hancock, pi. 67, fig. 9. 



The surface of the body is covered with regular wrinkles 

 like an Avion, the foot is linear, and the eyes are in pale 

 spaces at the posterior extremities of the ridges; the 

 species inhabit pools above half-tide. 



