APPENDIX 489 



with gills behind heart ; if shelled, without operculum ; /Eolidvid(B 

 (220). PuLMONATA, breathing by means of lungs, no operrulum ; 

 Auricididw (214) ; Liimiwidw (214) ; Limacida- (211j ; Helicidw 

 (213) ; Papidce (214). 



CEPHALOPODA. Mollusca with large head, mouth sur- 

 rounded liy a circle of arms, and funnel-shaped foot. Argonaididx 

 (221); Spir».Hd« (221) ; LoUyiiddm (221) ; N a lUil idee (221). 



ECHINODERMATA 



Animals of a prevailingly radial structure, with intestinal wall dis- 

 tinct from body-wall and with calcareous plates in the skin (192). 



CRINOIDEA. Sessile Echinodermata, having a cup-shaped 

 body (258). 



ASTEROIDEA. Star-shaped Echinodermata, with a furrow 

 along the under side of the arms (2.51). 



OPHIUROIDEA. Star-shaped Echinodermata, with ungrooved 

 arms (253). 



ECHINOIDEA. With armless, globular, or cake-shaped body 

 (254). 



HOLOTHUROIDEA. Worm-like, with tentacles around mouth 

 (256). 



ANNELIDA 



Bilateral, segmented worms without jointed legs. 



POLYCH^^TA. Annelida possessing parapodia on one or more 

 segments, and with many bristles on parapodia. Ereantia, free- 

 swimming Polychaeta : Autolytus (187), Lepidonotus (187), Nereis 

 (185). Sedentabia, PolychiBta which live in tubes composed of 

 mud, sand, or lime : Amphitrite (189), Polycirrus (189), Cistenides 

 (189), Clymenella (188), Serpula (189). 



OLIGOCH^^TA. Annelida without parapodia and with few 

 setfe ; living in fresh water or in the ground. Li.micol.e, aquatic : 

 Nais (173) ; Dero (172) ; Tubifex (172). Tereicol.e, earth-inhab- 

 iting : Allolobophora, Lumbricus (169). 



GEPHYRBA. Annelida having sessile habits and consequently 

 without external segmentation in the adult, setae sometimes present. 

 Phaseolosoma (176), Echiurus (177). 



