318 MR. CYRIL CROSSLAND OX THE [Feb. 16, 



luiddle region, reappeai'ing as combs of thi-ee or more filaments 

 posteriorly. In very young specimens, 1 mm. or so wide, the gills 

 ai-e all small and simple and not developed at all posteriorly. It 

 is thus sometimes difficult to determine a specimen of this species 

 whose posterior part is missing, but generally the distinct annu- 

 lations of the tentacles, and the breadth and deep notch of the 

 prostomium, form a sufficient distinction from the allied E. indica. 



This enlargement of the gills at the ends of the body is 

 evidently connected with the habits of the worm, by which the 

 head and tail, especially the former, are more frequently brought 

 into contact with the fresher water outside the bui-row. 



The relationships of this species to those next folloAving are 

 shown in the table on p. 287. It is also nearly related to, if 

 not synonymous with, U. t&rresiensis McI. {loc. cit. p. 270), with 

 which it agi-ees in eveiy pai'ticula-r, except that in the latter, though 

 the jaw-apparatus is of quite similai- foi-m, the numbei'S of the teeth 

 are smaller, and the gills in all his specimens begin at the fouith 

 foot. These variations are not importaiit, and by the inclusion 

 of these specimens the range of the species is extended to the 

 ToiTes Sti-aits. The species which Mcintosh doubtfully identifies 

 with E. elseyi Baird {loc. cit. p. 286) from the Arafura Sea, Noyth 

 Austx'alia, agrees in every detail except the shape of the mandi- 

 loular or lower jaw-plates, which are hei-e remarkably short in 

 pi-oportion to the length of the uppei-. In the head and its 

 appendages, feet, seta?, gills, and their distribution the species are 

 identical. 



(Similarly the fragment named by Mcintosh E. hassensis {loc. cit. 

 p. 298) has features peculiar to E. flacckla in its large posterior 

 gills, annulated anal and dorsal cirri, and golden three-hooked 

 <vciculai" setpe. An extension of range to include the Bass Straits 

 cannot, however, be held proven until better evidence than that 

 afforded by a single fi-agment can be adduced (but see note at 

 bottom of page 312, which gives the required corroboration). 



Eunice ixdica Kbg. (Plate XXI. figs. 9-12.) 



Eunice conqesta Marenzeller, '' Siidjapanische Anneliden," 

 Denkschr. Akad. Wien, xh. 1879, p. 134. 



This species, first recoi-ded by Kinbei-g fi'om Banks' Strait'*, 

 •and later by Grube from the Philippines, Marenzeller from the 

 south of Japan, and Gravier from the Red Sea, is represented in 

 these collections by more numerous and larger specimens than in 

 any of the above mentioned. The largest measures 75 mm. x 

 ■4 mm., and is one of the five of nearly equal size collected froiii 

 among sponges etc. at low spring-tide level in Chuaka Bay. From 

 the western side of Zanzibar come two specimens, one nearly as 

 large as the large Chuaka Bay example and one smaller, while 



* According to Mcintosh, loc. cit. Presumablj' Straits of Baiica to the west of 

 rimnatra are meant, not the Banks' Strait oft' tlie Canadian north-west. 



