90 



AUSTHALiAX SYLLIDAE. /■:CS) J.I.I OAl-J AXi!) AUIOLYTIUAE. 

 llv W. A. Haswki.l, yi.X.. D.Si'.. I'Mi.S.. K.mkritus Professou oi' liioLOuv, 



UnIVKRSITV (II- SvilXEY. 



(Witii i'hilcs x.-xiii.) 



INTHdHrcTIOX. 



This paper deals with the faiuilies Sjiiliiluc, EuaiiUidac and Aulolijtidac of 

 the section Syllidea (Polychaeta Phanerocephala), and is to some extent a con- 

 tinuation of one on the Exoc/onea recently* published. Unlike the latter, how- 

 ever, it is entirely systematic and descriptive, structural and developmental jjoints 

 bein": reserved for separate treatment. The material consists almost exclusi\-ely of 

 specimens collected by the author al)out low-water mark in Port Jackson atul 

 examined in the living condition in the Hrst instance. The types of the species 

 described as new have been deposited in the Australian Museum. 



In 1885 I published descriptions of six uieml)ers of the family Si/llidar I'ound 

 in Port Jackson. The original specimens jiave been lost, but the identity of Ave 

 of the six species is definitely determined as a result of Aus^-ener's study of the 

 Polychaeta collected by the Ilamburj;' Expedition to South-western Australia (1), 

 together witli the present contribution. There remains in doubt Giiutliosi/llis 

 sonata niihi. This was founded on a solitary specinuni obtained with the dredge. 

 There are indications that Auyener's identification with this of a TjipoiiiiUis in liis 

 collection is incorrect. 



The general classification here followed is that ol' IMalaquin, and, witliin the 

 extensive genus StiUh. the division into sul)-gcnera proposed by Langerlians and 

 followed by various recent writers (De Saint-. Joseph, Gravier, Augener) lias l)een 

 adopted . 



1 have found some dilficulty in dealing with the uenus PidimsiiUis. Mahn- 

 gren's original diagnosis (41, p. 3i)) comprises the following points — a single 

 pharyngeal tootli; compound setae with long slender bidentate appendages; capil- 

 lary setae on I lie middle and posterior segments; other characters as in St/llis. 

 The type species, P. compacta, has '"palpi ilistantes,"' "tentacula indistincte arti- 

 culata" and "cirri dorsuales vix articulali." 



In the classification of the S/iUidca clalxirated by Langerlians (3f)). Piono- 

 syllis is characterised as having the palpi not fused, the tentacles and dorsal cirri 

 not articulated, and as having the |iliarynx aniicd with a single tooth which is 

 situated anteriorly. 



In Malaquin's scheme (-10). I'iniKisiillis is grouped among the EunyUidae— 

 Syllidea possessing ventral cirri, having the jialpi fused at the base only, the 

 tentacles and dorsal cirri indistinctly articulated, and reproducing only directly 

 without schizogainy. From the other geiicia of that family it is distinguished by 

 the single, anterior \ pharyngeal tooth. 



,Joiu\ Linn. Soo. Lond., xxiv., No. 227. 



