242 



SUBAKTABCTIC ISLANDS OF NEW ZEALAND. 



IPdychaeta. 



Length of Body and of Peristomicd Cirrus. 



It will be seen that there is no apparent relation between the longest peri- 

 stomial cirrus and either the length of body or the diameter across the parapodia. 

 The latter measurement was taken at about one-quarter of the body-length. The 

 cirri were pressed gently back (not stretched), and the body kept horizontal. 



Unfortunately, Mcintosh does not give measurements of either of his specimens 

 of N. eatoni, and Ehlers, though noting the length, does not state the breadth of 

 the specimens of N . austrcdis nor of N. magcdhaensis. 



Lycastis (Sav.), Audouin and Milne-Edwards, 1833. 



Lycastis quadraticeps, Gay. (Plate IX, figs. 2-10.) 



1849. Lycastis quadraticeps. Gay, Historia fisica y politica de Chile, ZooL, iii, 

 p. 25; Atlas Annelid, pi. 1, fig. 7. 1901. L. quadraticeps, Ehlers, Poly- 

 chaeten magel. u. chilen. Strandes, p. 121. 



It is with some degree of doubt that I refer the specimens described below to 

 this species. 



With regard to the author of the specific name, I have followed Ehlers (1) and 

 Johnson (4), both of whom write " Gay " after it ; but St. Joseph, when comparing 

 his species L. senegalensis with L. quadraticeps (1901, Ann. Sci. Nat., Zool. (8), xiii, 

 p. 222) gives " Blanchard in Gay's Historia " as the author, as also did Ehlers in 

 his "Die Borstenwurmer " (1868), while Quatrefages (Hist. Nat., i, p. 200) writes 

 " Blainville," without any mention of Gay whatever. The literature at my disposal 

 is insufficient to enable me to explain this discrepancy. 



The species, originally discovered in 1849, was rediscovered by Michaelsen 

 during the Hamburg Expedition, and mentioned, but unfortunately not redescribed, 

 by Ehlers in his memoir on the Magellan Polychaetes. 



As I have not access to Gay's work, my thanks are due to Mr. A. R. 

 McCuUoch, of the Australian Museum, Sydney, for kindly making tracings of the 

 figures in Gay's "Historia." These figures would not enable one to identify the 

 species, so that I am not certain that my identification is correct; but an outline 

 figure given by Johnson (5) agrees well with my specimens both in general propor- 

 tional size of the head and peristomial cirri, in the relative size of the parapodia, 

 and in the existence of the funnel-shaped pygidium. 



The two lots of individuals in my collection are in different conditions of pre- 

 servation, and give rather different figures when measured. Those in strong alcohol 



