220 THE AMPHINOMID.E, APIIROUITID.E, TOLYNOID.E, AND SIGALIONID.E 



FAMILIES. 



Amphinomid^. 



Body elongate, or more or less ovoid. 



Parapodia much modified, the neuro and notopodia widely separated, 

 the latter merged in the dorsum and provided with chsetre, 

 branchiiTe, and cirri. 



Aphroditid^:. 



Body comparatively large, ovate or oblong. 



Choetce very strong. Parapodia bearing fifteen elytra, which are 

 sometimes concealed by a dense felt. 



POLYNOID^. 



Body more or less elongate, usually comparatively broad, more 



or less concealed by a variable number of elytra. 

 Prostomium, with four sessile eyes and three tentacles. 



ACOETID^. 



Body elongate, partially concealed by numerous elytra. 

 Prostomium, with pedunculate eyes and three tentacles, 



SlGALIONID.^. 



Body elongate, concealed by numerous elytra, which are accompanied 

 by a cirriform gill. Ctenidia on all parapodia. 



Family AMPHINOMID^. 



Prostomium rounded or compressed. A median and two lateral 



tentacles, though the latter may be absent, an elongated dorsal 



caruncle, and four eyes. 

 Body elongate, oblong or ovate oblong, feet with the noto and neuro- 



podia widely separated and furnished with cirri. 

 Mouth removed from the tip of the snout ventrally, with modified 



segments laterally ; protrusible proboscis devoid of jaws. 

 Parapodia peculiarly modified, the notopodium being extended and 



merged into the dorsum, but with chtetre, branchiae, and cirri. 



Chcette brittle, calcareous, and tubular, with gelatinous contents ; 



rarely hook-like spines. 

 Buccal apparatus and proboscis large and complex. 

 Anus dorsal, with two posterior appendages. 



Sub-Family I. AMPHINOMINA. 



Body elongate. A median and two lateral tentacles. Noto and 

 neuropodia widely separated. 

 Genus Paramphinome. 



Prostomium small. No caruncle, no eyes. Five tentacles. 



Branchiffi on anterior segments only. 



