476 



ANNELIDA. 



armed with chitinous jaws (Fig. 367). The septa and nephridia are 

 regularly repeated throughout the body. For the most part precla- 

 ceous ; a few form tubes. 



Fam. 1. Syllidae. Small worms with elongated, flattened body; head 

 usually with three tentacles, palps, and two to four tentacular cirri. The palps 

 are often fused with each other, or with the prestomium. Parapodia with a ' 

 single setigerous branch (neuropodium), often with a dorsal and ventral cirrus ; 

 the dorsal cirrus always appears with sexual maturity. Following the pharynx, 

 which has one or more teeth, is a special gizzard with thick muscular walls. 

 The oesophagus receives in many genera a pair of T-shaped diverticula. Sexual 

 and asexual forms are sometimes found in the same species. Many carry their 

 eggs about till the young are hatched. SyUis Sav., tentacles and cirri monili- 

 form, three tentacles; Odontosyllis Clap.; Trypanosyllis Clap.; Spliaerosyllis 

 Clap.; Grubea Clap.; Syllides Oersted; Pacdophylux dp. : Anoplosyllis dp. ; 



Eusijllis Mlg. ; 

 PionosyUis Mlg. ; 

 Pterosyllis Clp. ; 

 Exogone Oerst. ' 

 Autolytus Gr. , 

 palps small, and : 

 fused with pre- ' 

 stomium, no ven- 

 tral cirri ; A . 

 proUfer 0. F. M., < 

 asexual form, the 

 male has been 

 described as Poly- 

 bostrichus Mulleri 

 Kef. , the female as 

 Sacconereis helgo- 



1 



FIG. 384. The two sexes of Antolytns prolifer. 1, female carrying its 

 sac of eggs (Sacconereis helyolandica Hiiller). 2, male (Polybostrichits 

 Miillm Kef.), a antennae ; l> first pair of dorsal cirri ; c bifurcated 

 palps of the male ; d normal dorsal cirri ; e median antenna of male > 

 / tentacular cirri. (From Perrier.) 



384) ; Proccraea 

 Ehlers. Myrian- 

 ida M. Edw. ; M. 

 fasciata M. Edw., 

 with foliaceous 

 cirri (Fig. 376). 

 The position of Ne- 

 riIlaO.Schm.(L>u- 

 jardinia Clap.) is 

 uncertain. 



Fam. 2. Sphae- 

 rodoridae. Dorsal 

 and ventral cirri 

 spherical. Sphae- 

 rodoruni Oerst. 

 (Pollicita Johnst. ) 



Kvhesia Rathke 

 " __ . 



ram. o. JieslO- 



nidae. Body 



