476 



ANNELIDA. 



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

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

 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 gener% 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. Syllis Sav., tentacles and cirri monili- 

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

 Clap. ; Grubea Clap. ; Syllides Oersted ; Paedophylax Clp. ; Anoplosyllis Clp. ; 



Eusyllis Mlg. ; 

 Pionosyllis Mlg. ; 

 Pterosyllis Clp. ; 

 Exogone Oerst. 

 Autolytus Gr. , 

 palps small, and 

 fused with pre- 

 stomium, no ven- 

 tral cirri ; A. 

 prolifer 0. F. M., 

 asexual form, the 

 male has been 

 described as Poly- 

 bostrichus Miilleri 

 Kef., the female as 

 Sacconereis helgo- 

 landicaM.\i\].(Fig. 

 384) ; Proceraea 

 Ehlers. Myrian- 

 ida M. Edw. ; M. 

 fasciata M. Edw., 

 with foliaceous 

 cirri (Fig. 376). 

 The position of Ne- 

 rillaO.Sclim.(2)u- 

 jardinia Clap.) is 

 uncertain. 



Fam. 2. Sphae- 

 rodoridae. Dorsal 

 and ventral cirri 

 spherical. Sphae- 

 rodorum Oerst. 



FIG. 384. The two sexes of Autolytus prolifer. 1, female carrying its (Pollicita Johnst. ) 

 sac of eggs (Sacconereis helgolandica Miiller). 2, male (PolylostricMs Efihesia Rathke 

 Miilleri Kef.), a antennae ; b first pair of dorsal cirri ; c bifurcated ^ .' 



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

 / tentacular cirri. (From Perrier.) nidae. Body 



