752 OBSERVATIONS ON SOME AUSTRALIAN POLYCH^TA 



containing in their interior rounded particles of some gi-eenish 

 matter. 



Similar glands have been observed in Chlontuna and in 

 Stylaroides ; they are regai'ded by Claparede as equivalent to 

 the segmental oi'gans of Terehella and Amphlcteis. 



This species, which is obtained with the trawl in Port Jackson, 

 is apparently nearly related to Siphonostoma dij)lochaitos, Otto 

 (Chloraema Edioardsii Quatrefages), but, besides the possession of 

 four eyes, is distinguishable by the less strongly hooked ventral 

 setas. 



V. HALLA. 



Halla Australis. N. sp. 



(Plate LIV., figs. 6 and 7, and Plate LV. figs. 1-4.) 



The colour of this species is rich orange when first taken, but, 

 on being kept for a few hours in an aquarium, it becomes stained 

 particularly on the branchiae, with dark purple. When the 

 annelid is placed in alcohol a rich purple pigment is extracted. The 

 length is from thi-ee to four inches, and the breadth from a 

 fifteenth to an eighth of an inch. The number of segments is 

 great, exceeding 200. The segments, on an average, are about four 

 times as broad as long ; the parapodia are prominent, their length 

 being about a third of the breadth of the segment. 



The head is uniformly rounded, a little longer than broad, twice 

 the length of the peristomium, but rather narrower. There ai-e 

 three short, stout, conical, unringed tentacles, the middle one 

 slightly larger than the lateral, scarcely half the length of the 

 head. There are two pairs of eyes placed near the posterior 

 boundary of the head. The anterior pair are larger than the 

 posterior, oval, with the long axis directed inwards and forwards, 

 widely separated ; the posterior pair are much smaller, rounded, 

 placed close together between the anterior pair and a little behind 

 them. 



