POLYCHJETAv — BENHAM. 135 



The notopodial chaetophoral lip is unusually long and 

 ■distinct. 



The dorsal cirrus reaches only about half way along the 

 dorsal ligule ; there is no enlargement at its base. 



The chsetse are all colourless, as are also the acicula. 



In the 13th foot, the dorsal chaetae are about fourteen in 

 number, long homogomph spinigers, arranged in a fan-shaped 

 way. The supra-acicular bundle in the ventral lobe consists 

 of five similar chsetse, A^ith four heterogomph falcigers, which 

 have a long and knife-like appendix, hooked terminally, and 

 densely setose. (PL xhi., fig. 23.) The sub-acicular bundle 

 contains the same two kinds of chaetae. 



All the spinigers and all the falcigers are alike throughout 

 the worm. 



This specific name was evidently derived from the nature 

 of the denticles on the buccal region, which is covered with 

 small conical paragnaths forming a broad band of approxi- 

 mately equal width all the way round. Amongst them, how- 

 ever, are a few rather larger ones arranged in longitudinal 

 rows at intervals on the sides and under surface, which do 

 not appear to correspond to the areas VI., VII., VIII. 



. The maxillarj^ region presents groups of small denticles, of 

 about the size of the larger buccal kind, which are arranged 

 as follows : — 



I. A rectangular patch formed of four transverse rows of 

 2, 2, 3, 4. 



II. An elongated oval group of numerous densely massed 

 denticles. 



III. A patch of five or six transverse rows forming a 

 squarish group. 



IV. A broad, oval patch of densely massed points. 



It is only in the details as to the number of denticles in the 

 various patches that difi'erences exist between this and 

 Moore's specimens (see his Figs. 5-6, PL xL). It is recognised 

 that slight differences may exist in this matter without 

 affecting the identity of the species ; a few more or a few 

 less denticles in a group is a common variation. 



Loc. — East coast of Fhnders Island, Bass Strait. 



Distribution. — Wood's Hole, Massachusetts. 



