200 MR. T. B. BKDDARB OIV THE STRUCTURE [Mar. 5, 



Typhoeus incommodiis, n. sp. 



Of this smaller species, which is from the same locality as the 

 last, I have examined two individuals, one of which was larger 

 than the other, both, however, being fully mature. 



The length of the larger individual is 90 mm.; it has about 

 125 segments. 



The first three segments are simple and without annuli. The 

 nest three segments are biannulate, and the rest in front of the 

 clitellum have three annuli, upon the middle one of which are 

 situated the setse. After the clitellum up to nearly the end of the 

 body the segments are also triannulate. 



The lyrostomium is as in the last species. Its features are illus- 

 trated in the accompanying drawing (test-fig. 56). The couples 

 of setce are all of them farther apart, relatively speaking, than they 

 are in the last species. But, as in T. nicholsoni, the two setae of each 

 ventral couple are nearer together than those of the lateral couples. 

 The individual setse of the lateral couples get rather farther away 

 from each other towards the posterior end of the body. 



The present species is also characterized by the number and 

 position of the genital papiUce. There are four pairs of these in 

 both specimens, which are found only upou the clitellar segments, 

 the siiith to the svith inclusive. The papillae are esactly on a 

 line with the ventral couples of setse, and their size is such that 

 they occupy roughly the same amount of space upon the body. 

 The papillae lie close to the posterior border of their respective 

 segments, but not actually on the border line as apparently they 

 do in T. orientalis. The genital papillag project somewhat from 

 the general body surface and have a rim of white surrounding a 

 darker central area. They are almost circular in outline. 



The male generative pores lie upon the sviith segment, their 

 position being a little to the outside of the ventral couples of 

 setae. They are borne upon prominent rounded papillae of circular 

 contour marked off by grooves from the surrounding integument. 



The oviducal pores are unquestionably paired in the present 

 species. They lie in front of the innermost seta of each ventral 

 couple. 



The spermathecal pores are conspicuous slit-like orifices with 

 crenated hps. They lie farther apart than in T. nicholsoni, 

 between the ventral and lateral couples of setae. 



The alimentary canal offers two points of difference from that of 

 the last species. There is a definite pair of calciferous glands in 

 segment sii., and the intestinal glands are situated farther forward, 

 beginning in the Isviith segment. As in T. nicholsoni, the gizzard is 

 large and lies mainly (? entirely) in segment viii. 



There are two specially thickened septa in front of the gizzard 

 and three behind it. The last of the latter separates segments s./si. 



The last heart is in segment siii. 



The nephridia are numerous in each segment. 



The organs of reproduction show one unespected feature which 

 has not hitherto been recorded in this genus and which serves to 



