Introduction to Animal Morphology. 221 



double, with acicula, and no hair-like bristles ; they may be all 

 similar (Nereis), or some of the dorsal cirri feather-like (Den- 

 dronereis, &c.) 11. Nephthyidae — body long, many-jointed; 

 lateral feelers small ; peristome with no cirri, but with para- 

 podia and papillae in place of teeth. Nephthys, the "hairy 

 bait" of fishermen, has one anal cirrus. 12. Glycerids — 

 many ringed segments ; proboscis club-shaped, protrusible ; 

 bristles with acicula ; gills short, or none ; chylaqueous 

 fluid colored in some by red corpuscles ; vascular system 

 none. The proboscis may have four hooked teeth with no 

 points (Glycera), or rows of pointed teeth (Glycinde). 

 13. Phyllodocidae — long, many jointed; head lobes small; 

 feelers 4-5 ; eyes 2-4 ; epipharynx with papillae ; ventral cirri 

 leaf-like ; larvoe monotrochal ; the cirri leaf-like, covering 

 the back (Phyllodoce), or leaving it mostly uncovered 

 (Eulalia). These genera have four pair of prostomial cirri. 

 Eteone has two, and the leaf-like cirri do not at all cover the 

 back. Alciope has two large, Lopadorhynchus two small, 

 eyes. 14. Hesionidce — few-jointed, with broad head-lobes 

 and long peristomial tentacles ; protrusible unarmed epi- 

 pharynx, with no gills ; oars one- (Hesione, Oxydromus) or 

 two-branched (Ophidromus), or with an upper tubercular 

 branch and two delicate teeth (Castalia). 15. Syllidse — 

 elongated ; head with tentacles, often with eyes ; peristome 

 with 2-4 cirri, often united to the prostomium ; pharynx not 

 protrusible, sometimes toothed, or with a chitinoustube which 

 bears a boring spine ; oars one-branched, with two aciculate 

 bristle-clusters ; ventral cirri short, or none ; blood colorless, 

 but with colored corpuscles in Dujardinia ; circulatory organs 

 undeveloped or rudimental ; the sexes are dimorphic ; repro- 

 duction often by budding ; there may be ametagenetic con- 

 dition, the product of the development of an &gg multiplying by 

 gemmation, but itself remaining sexless (Autolytus). Oophylax 

 and Paedophylax carry their eggs about until they develop. 

 Gnathosyllis has pharyngeal jaws. Schmardia and Grubea 

 have a dagger-like pharyngeal organ. 16. Leucodoridas — 

 segments heteronomous, a few being small ; prostomium with 

 one thick and two little feelers ; peristome with two long re- 

 spiratory cirri ; feet two-oared, with bristles, or bristles and 



