OF MOLLUSCA. 229 



face of body entirely clothed with vibratile cilia. Head distinct. 

 Tentacles two, ear-like. Eyes distant, behind the tentacles. Vent 

 central, subposterior ; orifice on right side. Foot narrow. Lingual 

 membrane with a single series of plates, with a large central spine 

 and a spinose buccal collar. — See Voy. Bonite, t. 24 D, anat. 



1. E. timida, t. 18. f. 8, 9, t. 180. f. 12. 



2. E. fusca, t. 180. f. 10, 11. 



3. E. viridis, t. 18. f. 1-5, 7, t. 146. f. 4, t. 176. f. 2, 5, t. 180. 



f. 14, t. 199. f. 2 ; Forbes fy Hartley, B.M. t. C.C.C. f. 3. 



4. E. elegans, t. 199. f. 4. 



5. E. australis, t. 180. f. 6. 



2. Placobranchus. 



Tentacles four. Back with two lateral membranous expansions, 

 having their upper surface covered with folds. Lingual membrane 



1. P. ocellatus, t. 1/6. f. 4. 



Suborder VI. Pellibranchia. 



Gills : none distinct, the function being performed by the skin. 

 Tongue with a single series of teeth. 



Fam. XXI. LIMAPONTIAD^E. 



Tentacles two or wanting. Body depressed. Back without appen- 

 dages. Anus dorsal, posterior. Jaws none. A spinose buccal collar. 

 Lingual membrane with a single series of large spines. 



§ Tentacles crest-like. 



1. LlMAPONTIA. 



Body oblong, depressed in front, elevated and rounded behind. 

 Head distinct, arched and keeled on the sides. Tentacles wanting ; 

 eyes at their hinder ends. Back plain, without appendages. Vent 

 dorsal, subposterior. 



1. L. nigra, t. 177. f. 3, 4 ; Forbes fy Hanley, B.M. t. C.C.C. f. 4. 



2. L. cserulea, t. 199. f. 7. 



2. Act\eonia. 



Body oblong. Head large, distinct. Tentacles : two flattened 

 lobes at the sides of the head, prolonged behind into points. Eyes 

 behind the tentacles. Sides of the back with a tubercular ridge in 

 the region of the anus. Vent dorsal, subposterior. Lingual mem- 

 brane with a single central series of plates with a large broad spine. 

 A spinal buccal collar. 



