198 MK. F. B. BEDDABD ON EABTHWOEMS [Jan. 14, 



Dr. Michaelsen has also called atteutioa to the variability oE 

 the genital papillae. 



Of my specimens four are normal (i. e. there are 3 pairs on vii., 

 viii., ix.) ; in two the papillie are on vii., viii. on one side of the body, 

 on viii. only on the other ; in the seventh specimen these conditions 

 are exactly reversed ; in tlie eighth, one side of the body is normal, 

 on the other the papilloB lie on viii., ix., x. 



In six specimens from Maui ' the genital papillae and prostates 

 vi^ere as follows : — 



It is interesting to contrast this list with the last, on the hypo- 

 thesis, of course, that the islands upon which the two series were 

 collected are different. 



Thei:e were also two individuals from Mauna Loa, Hawaii, upon 

 vi'hich I do not comment, as there were only two. 



Perichaeta perkinsi, n. sp. 



The length of this species (of which I have examined two 

 examples) is 192 mm.; the diameter is 6 mm. The number of 

 segments is 110. 



The colour is of a light brown, darker on the back. 



The prostomiitOT is broad (2-5 mm.) but not long; it is cut off 

 from the first segment by a transverse groove. 



The buccal cavity is eversible, as in many Perkluetce. 



The first dorsal pore that I could detect lies between segments 

 xii./xiii. 



The clitellum occupies the whole of segments xiv.-xvi., and is 

 without set£B. 



The oviducal pore, distinctly a single pore, is situated in tiie 

 middle of a white area upon the brown clitellum on segment xiv. 



The ma?« poccs are rather wide apart, and upon segment xviii. 

 I counted eleven seta3 between them. Each pore itself is upon a 

 whitish papilla, and to the outside is another smaller papilla which 

 is not perforated ; the two are surrounded by several concentric 

 circular wrinkles of the integument. 



There are no genital papillce except the one just referred to 

 aud upon which open glands. 



The setce of P. perJcitm are not so numerous as in many other 

 species. The segments in the anterior part of the body have 

 fewer setiethan those which follow. There is a gradual increase up 

 to the xviith segment, whence the number appears to remain fairly 



' Mr. Perkins baa quorioci tho luculify. 



