1902.] NEW SPECIES OF EARTHWORMS. 193 



The septa dividing segments v./xi. are thickened. The dorsal 

 vessel is single, and the last pair of hearts are in segment xi. 



The gizzard lies in segment v. The system of calciferous glands 

 appears to be quite as in other species. 



In the xith segment are the dilated chambers which form the 

 commencement of the single pair of sperm-ducts. 



The sperm-sacs of Pjolytoreutus ke^iyaensis, as is the case with 

 all other sjDecies of the genus, are but a single pair and are of very 

 considerable length. In a worm measuring 9 mm. in length the 

 sperm-sacs were 15 mm. long. As is the case with many other 

 species of the genus, the sperm-sacs are divided into two i-egions : 

 the anterior half is a thin slender tube, while the posterior half of 

 each sperm- sac is swollen and deeply constricted where it passes 

 through the septa. This latter region begins at about the xxivth 

 segment and extends to the xxxviiith. For three or four segments 

 the slender sacs which form the anterior part of the sperm-sacs 

 are also constricted where they traverse the septa. Latterly, the 

 sperm-sacs show no signs of division into two sacs, they are 

 completely blended for a tract which extends some little way 

 forward from the posterior end. 



The spermiducal glands are tubular and straight or a little 

 coiled. I did not notice any marked division into two regions as 

 in the spermiducal glands of P. gregorianus. There are here 

 and there slight constrictions along the walls which produce 

 irregular bulgings of the tube. In oiae case, and place, this bulging 

 was so marked that the; permiducal gland ended in a bifid 

 extremity. The large bursa into which both these glands open is 

 more or less circular in contour. 



The spermathecal apparatus appears to differ from that of any 

 other species in that it has no diverticula. It commences ante- 

 riorly not far from septum xiii./xiv. and pursues a straight .course 

 to its point of opening on to the exterior between segments 

 xviii./xix. It is a narrow tube and flattened against the ventral 

 body- wall, being ovei-laid by the nerve-cord ; at the posterior end 

 it is wider for a short space before its external orifice. Anteriorly 

 the sac ends blindly in a rounded extremity. Into this open the 

 two oviducts directly, and not through the intermediary of diver- 

 ticula of the sac as in other species of the genus. The oviducts 

 are slightly coiled and, as usual, thick- walled and present a very 

 different appearance from the spermathecal sac into which they 

 open. Traced in the opposite direction, the oviducts pass to the 

 exterior through a rounded thick-walled chamber which Dr. 

 Michaelsen has called the " Eitrichterblase," to which is appended 

 a receptaculum ovorum. The latter is very much larger than the 

 Eitrichterblase from which the oviduct runs to the external pore. 

 Several chambers packed with spermatozoa ("Samenkammerchen" 

 of Michaelsen) are appended to the oviduct close to its exit from 

 the receptaculum, as in many but not all species of Polytoreutus. 

 I may observe that the oviduct is ciliated throughout, not merely 

 that portion of it which passes from the receptaculum to the 



Proo. Zool. See— 1902, Vol. II. No. XIII. 13 



