220 Introduction to Animal Morphology. 



head-lobes developed, with a single tentacle and lateral 

 antennae and palpi ; eyes sessile or stalked (Pontogenia, 

 Hermione) ; gills small, simple ; epipharynx mostly with tsvo 

 upper and two lower teeth and jaws; vascular system often 

 rudimental ; one central tentaculum and lateral antenna-, and 

 sometimes palpi. Polynoe has no prostomial tub' 

 eyes 4 ; 12-35 pair of elytrac. Gastrolepidia has ventral as 

 well as dorsal scales. Aphrodite, the sea-mouse, h. 

 oblong body, iridescent elytrcu on the 2-4, 5-7 *** 23-25-28, 

 &c., segments ; eyes sessile, facial tubercle under the ^ 

 frontal tentacle. Iphione is oblong, with two lateral head- 

 lobrsand two frontal tentacles ; noto- and neuropodia united. 

 . s has two eyes, and no facial tubercle. 7. Palmyridie 

 elytra; none : each segment covered by a fan-like group of 

 palea< lies; dorsal cirri alternating with tubercles; 



si'gmriit> many (Bhawania), or few; eyes i (Palmyra) or 4 

 (Paleanotus). 8. Amphinomidae angular or ilat ; segments 

 equal, not many; head small, usually with five tent, 

 toothless ; gills dorsal, comb- or tree-like; bristles hair-like, 

 serra;< . icular ; head-lob 



.1 caruncle may bi- Ion . .. nt earn : 



'.ied gills (Kiij ; uncle is absent, and the 



head-lobes small in Ilippmior, or there may be round ; 



with frontal ; bipinnate gills on each 



segment remote from the i . or at the point of 



the f. . aruncle may be heart- 



shaped (Amphinome), or with leaf-like lateral lobes (Rer- 

 un nl ice). 9. Euniceidac rounded, long, with many meta- 

 . ilattened ventrally, living in sand-burrows; head- 

 notched in front, with 1-5 tentacles; several separate 

 upper, and two, often united, lower jaws; parapodia simple, 

 with acicula ; gills either beside the dorsal cirri, simple, 

 comb-shaped (Eunice, Onuphis), or spiral (Diopatria), or 

 bsent (Lumbriconercis, Lysidice), or replaced by leaf- 

 like dorsal cirri (^Enone, Aglaura). 10. Xereidx body 

 long, with two anal cirri ; head flat, small, with four 

 two small middle and two large outer feelers ; peristome with 

 eight feelers ; epipharynx protrusible, with two large hori- 

 zontally movable jaws, armed with denticles; parapodia 



