208 Ma. F. E. deddaud on bahtiiwohms [Jan. 14, 



and P. hesperidum. I am able now to alter this list, by removing 

 P. hermudensis, which I have received from Hong Kong ', and also 

 odding to the first list P. violacea and P. sinensis, which I have received 

 from Trinidad and Grenada, and to the second the two new species 

 described in this paper. The first list will then contain eight species, 

 and the second eight. Seeing the large number of species which 

 have been in all probability introduced into the West from the East, 

 it is in my opinion by no means to be taken for granted that the 

 genus Perichceta is indigenous in the West Indies and South America. 

 I am disposed to look upon it as a distinctly Oriental genus. 



AoANTHODHILrS MACQUAEIBNSIS, 1\. sp. 



Of several specimens of this apparently new species only two 

 were sexually mature. 



It is a small species, measuring about an inch in length, and 

 consisting of some 100 segments. 



The prostmnium is incomplete, not dividing the peristomial 

 segment. 



The sttce are distant from each other, but not equally so. The 

 two ventral of each side are more closely related than the two 

 dorsal. The actual distances are much as indicated in the 

 following scheme : . 



S. 1 S, 1 S, If S„ 



for the anterior segments of the body. Behind the clitellum the 

 distance separating the two ventral sette is about half that which 

 separates the two dorsal. Towards the xviiith segment and on 

 both sides of it the two seta3 of each ventral couple get closer 

 together, and on the xviiith segment these sctas are closer together 

 than anywhere else. A similar convergence of the setaa towards 

 the segment bearing the male pores has been noticed in various 

 species of the genus Microscolex. On the xviith and xixth segments 

 the ventral setse are altogether absent, beiug replaced by the penial 

 setae. 



The nephridiopores open in front of seta 3. 



One of the two sexually mature individuals had no papillce ; u]5on 

 the other there were a pair of these structures corresponding 

 in position to the ventral setas. One of them was evidently 

 abnormally situated, for they were upon different segments, the 

 right-hand one upon the tenth, the left-hand upon the eleventh 

 segment. The clitellum occupies segments xiii.-xvi., commencing 

 at about the middle of the former segment. It is continuous 

 across the ventral surface except perhaps for the last of the seg- 

 ments over which it extends. 



The ovidueal pores are paired, and upon segment xiv. each lies 

 in front of seta 1. 



The male pores (on xviiith) are to the outside of seta 2. The 

 spermiducal gland-pores correspond in position to the outer seta 



1 Typical specimens, not doubtful P. hawayaua ; see pp. 202-203. 



