190 SYLLID^. 



This fine worm has much the appearance, on a slight glance, of 

 the PhyUodoce viridis. It reminds the helminthologist of the Ne- 

 reides which have the appendages of the posterior feet compressed 

 and expanded into lamellse. My only specimen did not afford feet, 

 from which a distinct idea of their form could be derived, having 

 become softened in the spirits. Oersted describes them thus : — 

 " Pinna utraque in anteriore corporis tereti parte in unam trilobam 

 abbreviatam connata, in posteriore depressa vero pinnis duabus dis- 

 cretis elongatis, superiore subquadriloba, inferiore biloba, cirro infe- 

 riore nuUo." The specific name is derived from a character which 

 seems either to be inconstant, or removeable by the spirits in which 

 the specimen is preserved. I find no trace of the spots on the seg- 

 ments, except an obscure one on the segments near the anal extremity. 



(a) Scotland, Dr. Greoille. 



Fam. VIII. SYLLID^. 



Nereides Sylliennes, Savign. Syst. Annel. 13. 

 SvLLiDiE, Williams, Rep. Brit. Assoc. 1851, 212, 233. 

 Syllidea, Grube, Fam. Annel. 60. 



Char. Body scolopendriform, polypodous or myriapodous, often 

 linear, the anal segment with two styles : head small, flattened, 

 roundish, inclining to triangular, with frequently two inferior lateral 

 lobules projecting beyond the front, giving it a bilobed character : 

 antennse three, posterior : eyes four or two : occipital segment with 

 two pairs of tentacular cirri, between which there is sometimes a 

 small tuft of bristles : mouth terminal or ventral, with a long cylin- 

 drical proboscis without jaws or marginal papillae, but sometimes 

 with a small point for boring : branchiae none : feet uniramous, 

 small, with a dorsal and ventral cirrus, and furnished with a spine, 

 and with setaceous simple and compound bristles. 



19. SYLLIS. 



Syllis, Savign. Syst. Annel. 43. Cuv. Regn. Anim. iii. 203. Lam. 



Anim. s. Vert. v. 317- And. ^ M.-Edw. Litt. de la France, ii. 204. 



Johnston in Ann. Sf Mag. Nat. Hist. xv. 145. Williams in ibid. 



ser. 2, xii. 403. 

 Nereisyllis, Blainv. in Diet, des Sc. nat. Ivii. 472. 



Char. Head with two lobes projecting beyond the front, and 

 making it appear more or less bilobed : eyes four : antennse submo- 

 niliform, similar to the tentacular cirri : myriapodous, the foot with 

 an elongated submoniliform superior cirrus, and with a short un- 

 jointed inferior cirrus. 



