POLYCHiETA - — BENHAM. 143 



The first specimens obtained in Ne\\ Zealand waters were 

 found in the topmost Avhorls of a gastropod shell inhabited 

 by a Hermit-crab, but later others were met with free in the 



Family GLYCERID.E. 



Genus Glycera, Savigny. 



Glycera tesselata, Grube. 



(Plate xlvii., figs. 23-25.) 



Olycera tesselata, Grube, Arch. f. Naturgesch., xxix., 1863> 

 p. 41. Id., Ehlers, Die Borstenwiirmer, 1864-68, p. 

 654. Id., Treadwell, Bull. U.S. Fish Comm., xx., 2, 

 1903, p. 201. Id., Moore, Proc. Acad. Nat. Sci. Phila- 

 delphia, 1903, p. 464 ; Id., Moore, Loc. cit., 1908, p. 

 348; Id., Moore, Loc. cit., 1911, p. 300. Id., Izuka, 

 Journ. Coll. Sci. Imper. Univ. Tokyo, xxx., 1912, 

 p. 241. 



Five individuals, from the seas around Tasmania, represent 

 this non-branchiate species with long pointed anterior para- 

 podial hps and two shorter rounded posterior lips, with long 

 filamentous pharyngeal papillae, and a terminal eyespot on 

 the prostomium. 



One specimen measures about 50 mm. in length, for it is 

 twisted and, therefore, its actual length impossible of measure- 

 ment. Its breadth is 3 mm. and the number of segments 

 about 100. 



The prostomium is short, with about 10-12 annulations ; its 

 length about twice its basal width, and as great as the length 

 of two normal segments. It is, however, bent backwards in 

 this individual and covers 7-8 segments, which are much 

 shorter than the later ones. At its tip it carries the usual two 

 pairs of short tentacles, and between them, on the ventral 

 surface, is a black pigment spot, which, however, is absent in 

 one specimen from Maria Island, Tasmania. The body 

 segments are biannulate dorsally, the length of those in the 

 anterior region about l-5th the diameter of the body, but in 

 the hinder half of the worm l-4th this diameter. 



The colour is in most cases a uniform yellowish brown, but 

 in two specimens from Maria Island the anterior segments 

 and the prostomium are speckled with brown pigment. 



