BY J. J. FLETCHER, M.A., B.SC, 383 



ovaries have the usual situation in xiii ; the oviducts commence 

 opposite them in the same segment and open to the exterior in 

 XIV ; spermathecse not visible. Lying beside each genital duct are 

 two small sacs each containing two penial setae about "7 mm. long 

 gradually tapering to a fine point. 



The last pair of hearts is in xii. 



Segmental organs consisting of a pair of convoluted tubules in 

 each of the segments with the exception of a few anterior ones. 



Hah.—Mt. Wilson. 



This interesting little worm is the only one with eight rows of 

 setae as yet forthcoming from this locality. When alive it resembles 

 in appearance the small perichfete worms. So far I have been 

 able to examine only a few small spirit specimens, a number of 

 living specimens which I brought down after my last visit having 

 unfortunately died before I could examine them. The sperma- 

 thecse and gizzard may have been overlooked, but so far I have not 

 been able to find them, 



Perissogaster excavata, g. et sp. n. 



Three (spirit) specimens from the Hunter are 69 mm., 195 mm., 

 and 250 mm. (a softer specimen) long i-espectively, and 3 mm., 

 13 mm., 15 mm. broad respectively, and comprise about 160 to 175 

 segments. A (spirit) specimen from the Hawkesbury is 334 mm. 

 long, 15 mm. broad, and comprises 195 segments. 



Prostomium wide, slightly depressed, ribbed by about five 

 somewhat irregular longitudinal grooves, dividing the anterior 

 annulus of the buccal ring. The latter is ribbed anteriorly by 

 longitudinal grooves ; superiorly and laterally it is marked with a 

 slight transverse furrow at about J from its anterior margin, 

 incompletely dividing it into two annuli, and limiting the prosto- 

 mium posteriorly. Segments broadest in the antei-ior region of 

 the body, especially from about iii to xvii ; the first three segments 

 bi-ann\ilate, ii and iii with the setae towards the posterior margin 



