NEW OK IMPERFECTLY KNOWN SPECIES OF EAKTHWOKMS. 17 



Spermathecse three pairs, in VI, VII, VIII, with appendicular diverticula twice as 

 long as the main portion. Sperm reservoir in XI, XII. Ovisac absent. Prostate 

 glands lobate, in XVII— XIX. 

 Loc. — Tokyo. 



23. P. agresiis, n. sp. 

 Length 100 — 160 mm., breadth 5 — 8 mm., number of segments 80—96. Clitellum 

 XIV — XVI, without sette. Number of seta? in the spermathecal region 36,- more 

 posteriorly 40 or so. Spermathecal pores three pairs, in V/VI^ VI/VII, VII/VIII. 

 There are no genital papilla? in this region ; but there are two pairs of slightly elevat- 

 ed squarish patches of a light brown color inside the spermathecal pores, one in VII 

 and the other in VIII. A similar patch or patches are present in P. Masalahc 

 Bed. and P. Hilgendorfi Mich., and in these species there are numerous small papil- 

 la? on the external surface of the patches, on which the so-called " capsulogenous 

 glands " open ; but in the present species there are no papilhe on the outside nor any 

 capsulogenous glands on the inside. We think, however, that these patches serve the 

 same purpose as the genital papilhe. No male pores could be observed. First dorsal 

 pore in XII/XIII. 



Gizzard in Vili, IX ; intestine beginning in XV, with one pair of coeca in XXVII 

 bearing 7 pairs of secondary diverticula. These secondary diverticula are longest 

 next the dorsum and thence gradually decrease in length towards the ventrum, the 

 longest ones reaching as far anteriorly as segment XXIV. Thickened septa V/VI — 

 VI/VII and X/XI— XIV/XV ; septa VIII/IX— IX/X wanting. Spermatheca? 



, three pairs, in VI, VII, VIII, with diverticula longer than the 

 / / main sac, but almost straight or very slightly winding (fig. 7.) 

 / I // Sperm reservoir in XI, XII. Ovisac present. Prostate g'and 

 / iff absent. Sperm ducts asymmetrical and terminating with bul- 

 (/ J J bular swelling either in segment XIII or XVIII or even more 

 / III posteriorly. 



M/ Loc.— Takahashi (Prov. Bitchu), Tokorosawa (Prov. Mu- 



Fig. 7. sashi), Oarai (Prov. Hidachi). 



Among more than one hundred specimens of this species in our hands we find 

 some in which the first dorsal pore lies in XI/XII, and a few without the modified 

 patches above described, as also a few with a pair of large papilla? (of 0.8-1 mm. in 

 diameter), in front of the chaetal line in segment XVIII. All these variations, 

 which occur independently, were found in the specimens from Oarai. 



