334 MANUAL OF THE MOLLTTSCA. 



? Dendronottts, a. and H.* 



Etymology y dendron, a tree, notos, the back. 



Type, D. arborescens, PI. XIII., Pig. 10. 



Animal elongated ; tentacles laminated ; front of the head 

 with, branched appendages; gills arborescent, in single series 

 down each side of the back ; foot narrow ; lingual teeth 10.1.10; 

 stomach and liver ramified. 



Distribution, 3 species. Norway and Britain. On sea-weed 

 and corallines ; low water — coralline zone. 



?DoTO, Oken. 



Etymology, doto, a sea-nymph. 



Example, D. coronata, PL XIII., Pig. 11. 



Animal slender, elongated ; tentacles linear, retractile into 

 trumpet-shaped sheaths ; veil small, simple ; gills ovate, muri- 

 cated, in single series down each side of the back ; lingual 

 membrane slender, with above 100 recurved, denticulated teeth, 

 in single series ; foot very narrow. 



The stomach is ramified, and the liver is entirely contained in 

 the dorsal processes, which fall off readily when the animal is 

 handled, and are soon renewed. 



Distribution, 4 species. Norway and Britain. On corallines 

 in deep water — 50 fathoms. 



Gellina, Gray. 



Head simple ; papillae or gills smooth. 

 Distribution, 1 species. North Sea. 



PMelibcea, Eang. 



Type, M. rosea. Rang ; on fioating weed, off the Cape. 



Animal elongated, with a narrow, channeled foot and long, 

 slender tail ; sides of the back with 6 pairs of tuberculated lobes, 

 easily deciduous ; tentacles cylindrical, retractile into long 

 trumpet-shaped sheaths ; head covered by a lobe-like veil ; 

 sexual orifices behind right tentacle, excretory behind first giJ. 

 on the right side. 



Distribution, 3 species. South Sea and South Africa. 



? LoMAi;roTUS, Yerany. 



Example, L. marmoratus, PL XIII. , Pig. 12. 

 Synonym, Eumenis, A. and H. 



* This and the following genera are placed by Alder and Hancock in the family 

 ^otidce; they have a ramified stomach, but their external {zoological) characte.'s 

 agree better with Tritonia than ^olis. 



