BY J. J. FLETCHER, M.A., B.SC. 399 



three pairs of spermathecal pores are between vi and vii, vii and 

 VIII, VIII and ix, in line with the second seta on each side. The 

 dorsal pores commence after segment v. 



Setfe of the ordinary shape but with the sigmoid flexure not 

 quite so marked as usual, less numerous, thicker and twice as long 

 (0*93 mm.) and further apart in the anterior region ; at first 28 

 per segment (sometimes 24) increasing posteriorly to about 36 ; 

 a narrow space devoid of setse in the median dorsal line, at first 

 about twice the width of the interval between two setae, but 

 gradually diminishing posteriorly ; in the median ventral line a 

 slightly wider interval conspicuous throughout. 



In regard to the divisions of the alimentary canal, the number 

 and situation of the various reproductive organs, the vascular 

 system, and the segmental tufts, this species sufficiently closely 

 resembles P. austrina as not to call here for detailed description. 

 The gizzard is in segment v as it is in that species, and not in 

 VI as previously stated. 



Nine mesenteries from the posterior one of vi to the posterior 

 of xiv are very thick and muscular. Segments x and xi were 

 crammed with masses of spermatozoa enclosed with the ciliated 

 rosettes in each segment in a delicate membranous sac. 



Hah. — Raymond Terrace, Hunter River, N.S.W. 



With two specimens of this species I received several other 

 perichsete worms, one at least of a difierent species, but too small 

 and too soft for satisfactory determination at present ; also a 

 large number of specimens of Allolohophora turgida, all from the 

 same neighbourhood, and for which I am indebted to the kindness 

 of a lady. 



Perich^ta Hamiltoni, n. sp. 



A good (moderately contracted) spirit specimen comprising 1 48 

 segments was 14'3 cm. long, and 5 mm. broad : three other speci- 

 mens out of a number found dead after a flood in the Cudcresfong 

 River, less contracted and softer, were 28, 30 and 35 cm. long 

 respectively and 6-8 mm. wide ; the largest one comprising about 

 150 segments. 



