EOLIDID^. 227 



which the gills are thickened and few, arranged along the 

 back in a single zigzag line. The remaining species are — 

 U. pa^nllosa, PeacJiii, glauca, longicornisy Brummondiij 

 punctata, Uneata, elegans, smaragdina, gracilis, pui'imrascens, 

 alba, inornata, angulata, concinna, aiirantiaca, vittata, glot- 

 tensis, amoena, areyiicola, viridis, carulea, amethystina, Far^ 

 rani, despecta, exigua. 



The gills of the next genus, 



LoMONOTUS,, are short papillae, placed on the fringed edge 

 of the mantle. L. marmoratus is, as its name implies, mar- 

 bled with several tints ; L. fiavidus is palely ringed or striped 

 with yellow. 



Dendronotus arlorescens is well named, having its ten- 

 tacula armed with branches, and the gills arranged down the 

 back in a double row of many -branching processes; it looks 

 like a Httle submarine forest creeping in and out among the 

 seaweeds. 



DoTO coronata and B.fragilis are prismatic, and have, 

 on each side of their backs, a row of branchiae, shaped hke 

 miniature pine-apples. They feed on zoophytes. 



OiTHONA nohilis has teat-like gills, arranged on the edges 

 of a very narrow mantle border. 



The microscopic EmLletonia pulchra and E. mimda are 



