420 MR. F. E. BEDDARD ON NEW [Apr. 23, 



Polytoreutus granti, sp. n. 



In describing some years since * several species of this genus 

 fi'om East Africa, I found among a collection from Mt. Kenya 

 two closely allied species, which, however, were plainly to be 

 differentiated upon a careful study. It is interesting to find upon 

 Ruwenzori the same presence of two closely allied species of 

 Polytoreutus, not — it may be remai-ked — specially related to their 

 congeners of Kenya. To find closely related species in the 

 same comparatively restricted area is rather moi'e remarkable 

 than would have been the existence of more remotely allied 

 examples of the same genus. This species, which I have named 

 after Mr. Ogilvie-Grant, F.Z.S., comes neai-er to Polytoreutus 

 hirimaensis than does P. ruivenzorii. It is represented by a 

 single specimen, not fully mature as to the clitellum, but appa- 

 rently quite fully mature as to the sexual organs. One of the 

 two cojDulatory chambers and the penis were protruded. The 

 size and the external characters generally agree with those of 

 P. ruioenzorii. 



The worm is a trifle more slender. The clitellmn was not 

 developed, and upon the segments to be included in it I observed 

 no deficiency of setfe svich as occurs in P. ruioenzorii. The re- 

 lations between the distances which separate the two setm of each 

 pair are much as in P. ruwenzorii. In the same way I observed a 

 long tube of chitin to be extruded from the nephridiopores. I do 

 not like to assert positively that there is a difference between 

 the two species in the segment which contains the first pair of 

 nephridiopores. But in the present species I noted a pair of 

 these apertures in the third segment, i. e. a segment further 

 forwards than I observed the same pores in P. rittoe^izorii. The 

 internal anatomy seems to agree with that of P. ruivenzorii and 

 other species of Polytoreutios in the alimentaiy canal with its 

 appended calciferous glands and in the situation of the last 

 heart (eleventh segment). It may be mentioned, however, that 

 P. granti, like P. ruioenzorii, has the dorsal vessel doubled 

 in the twelfth segment. This doubling of the dorsal vessel is 

 known in the genus Polytoreutus — for example, in P. gregorianus t. 



The male organs of reproduction are much like those of 

 P. ruwenzorii, and yet show differences in minutiae. As in that 

 and other species of the genus, there is but a single vas deferens 

 on each side, ending in front in an elongated chamber ("Samen- 

 magazine ") behind the funnel. The sperm-sacs are but a single 

 pair. They are elongated and not so markedly thin anterioi-ly as 

 in P. ruwenzorii and other species. The right-hand sac, as in 

 that species, is longer than the left, but the difference is not 

 quite so pronounced. The length of the longer sac is 21 mm. 



* " On some new Species of Earthworms belonging to the Genus Polvtorevfus, &c.," 

 P. Z. S. 1902, vol. ii. p. 190. 



t Beddard, P. Z. S. 1901, vol. i. p. 191. sMichaelsen has not referred to the con- 

 dition of the dorsal vessel in the species with which the present is particularly 

 compared. 



