1892.] NEW SPECIES OF EAKTHWORMS. 139 



like the pore of the next somite, is in line with the chsetse " 4 " ; the 

 pores in somites v., vii., ix., xi., xiii., xv., &c. are in line with chsetse 

 "3"; those of the even-numbered somites are inline with chsetae "4"; 

 but in the case of somites vi., viii., x., xii., I did not actually see the 

 pores, as the dorsal body-wall in this region of the body had been 

 injured in dissecting the worm, but there is no pore in either of 

 these somites in line with either of the other chsetse. 



[In P. heteroporus, the nephridiopores of somites iii., iv., v., vi. are 

 in line with the third chsetse, those of vii., ix., xi., &c. with the fourth 

 cheetse, and those of viii., x., xii., &c. with the second chaetee, with 

 some divergence from regularity in certain somites.] 



The male pores are on somite xviii., just between the first and 

 second chsetse ; but in the immature specimen, as I have mentioned, 

 there is a pair of papillae in this position, which carry the pores ; 

 the papillse in the fully developed individual being continuous with 

 the rest of the glandular modification of the clitellum. 



With regard to P. heteroporus, Perrier states (p. 255) " il nous 

 semble que les orifices males etaient accompagiies chacun d'une 

 papille en avant et en arriere," but owing to the state of preservation 

 of the worm he was uncertain on the point. The figure (Plate VII. 

 fig. 1) which accompanies the present paper might suggest these 

 papillse, but the slight pit represented between somites xvii. and xviii. 

 is not the male pore, which lies on the slight papilla on somite xviii, 



I was unable to see the pores in somite x. which Perrier regarded 

 as those of his " oviducts " ; they, in fact, do not exist in the present 

 worm. With regard to these pores, his figures are not in agreement 

 with one another. 



The spermathecal pores (which are in line with chsetse " 2," at the 

 anterior margin of somites vi. to ix.) and oviducal pores (on somite 

 xiv.) are not visible in surface view. 



There appear to be no dorsal pores ; this is one of the few points 

 in which my specimen differs from P. heteroporus. 



Internal Anatomy. 



The septa bounding posteriorly each of the somites v. to xi. are 

 considerably pouched centrally, so that the organs in these somites 

 are carried backwards in such a way that they appear to occupy a 

 more posterior position than they actually have ; the septa behind the 

 somites viii. to xii. are slightly stronger than the others (Plate VII. 

 fig. 3). 



The nephridia conform to the usual type ; the coiled tube pre- 

 senting the three regions which I have described ^ in those of 

 Lumbricus and which appear to be pretty generally present in 

 " ineganephric " Earthworms. 



The muscular region or " bladder " is very large, and differs in 

 size in the two series of nephridia. The funnel has the normal 

 structure and position — i. e. it is prseseptal. 



The genital organs have the following arrangement, as determined 



1 " The Nephridium of Lumbricus," Quart. Journ. Micr. Sci. xxxii. p. 294. 



