178 ' ENDEAVOUR SCIENTIFIC RESULTS. 



It is curious that Gravier in referring to Savigny's species 

 on p. 179, repeats the error about the. tentacles which had 

 been pointed out previously by Ehlers and Grube. 



So far as I can see the only differences are in reference to 

 these errors and the dimensions of the various forms. They 

 all agree in being uniformly coloured without pattern, such 

 as occurs in most of the other species typified by H. pan- 

 therina, Risso. 



A re-examination of the species is desirable. 



The following is a description of the single specimen 

 obtained by the " Endeavour " : 



Length, 47 mm. ; widest at mid-body, 8 mm., or including 

 the parapodia 19mm. From this point it tapers towards 

 each end, the first segment measuring 4 mm. and the last 

 3 mm. 



The anus is situated at the end of a funnel turned dorsally, 

 and this funnel is preceded by a preanal segment, which is 

 dark brown, the rest of the body being a pale yellowish tint. 

 The worm is, perhaps, like Savigny's type, " margaritaceous 5; 

 or " pearly " in life. 



The usual division -lines are noticeable, separating a median 

 dorsal area from lateral areas, and the sides are swollen at 

 the points to which the parapodia are attached. 



On the under surface the median area is dotted with brown 

 pigment. This is not mentioned by other authors, but it 

 does not seem to me a specific character ; this dotted area 

 is interrupted by pale circular spots at each intersegmental 

 line (possibly over the ganglia). 



The head is a good deal compressed owing to pressure 

 against the bottom of the tube ; the prostomium is broader 

 than its length, and its width is about one-third that of the 

 peristomium, which is intimately fused with its anterior 

 end. It is bilobed, with two pairs of eyes, and anteriorly a 

 pair of minute tentacles which are easily overlooked, but 

 can be detected 011 using a Leitz dissecting microscope, 

 No. 16. Each is a transparent somewhat elongated conical 

 organ. The peristomium, composed of four segments fused, 

 is as wide as the first chsetigerous segment. It carries eight 

 couples of long peristomial cirri on each side, the dorsal cirri 

 being about twice as long as the ventral, and the longest 

 reaching as far back as the fourth chsetigerous. The first 

 ventral cirrus is shorter than the others. 



