BY J. J. FLETCHER, M.A., B.SC. 565 



The supra- and sub-intestinal vascular trunks are joined in 

 segments vi to xn by seven pairs of hearts, of which the last three 

 pairs are largest, but in this species also there are some pecu- 

 liarities about these organs which require further examination. 

 Some of the anterior segments shew masses of glandular tufts 

 which may be the segmental organs. The further consideration of 

 these organs also is postponed. No nephridiopores discernible. 



Hab.— Burrawang, Mt. Wilson (?), Sydney, N.S.W. 



Obs. — Notwithstanding the presence of two oviducal apertures 

 instead of a single one, and the absence of intestinal caeca, these 

 worms possess so many important characters in common with other 

 species of the genus Perichceta, that I have included them in it. 

 A better knowledge of the Mt. Wilson worms may necessitate the 

 making of a new and separate species for them, for, though they 

 agree fairly well on the whole with Burrawang specimens, they 

 still present several points of difference, as in the position of the 

 sperinathecal apertures, and of the bend of the genital duct, and 

 possibly in other respects. As I have had only two specimens 

 from Mt. Wilson, and only one of them for dissection, I prefer 

 to consider them as a variety of the species, until I can study 

 them more fully. 



Sydney specimens are smaller and have fewer setae, (one 

 example 55 mm. long had about 24 setae per segment) but have 

 the same general characters in regard to the clitellum and internal 

 organs. From Seven Hills, beyond Parramatta, I have recently 

 obtained two worms similar in size and general appearance to 

 Sydney specimens but differing among other respects in having 

 four pairs of spermathecEe, some of which have excessively long 

 caeca. I hope shortly to procure better examples of this worm, 

 which may be the same as the third worm from Mt. Wilson, 

 previously mentioned. 



7. Perichceta Coxii, n. sp. 



The commonest worm at Mount Wilson is, when looked at from 

 above, in colour and general appearance, apart from the clitellum, 



