504 l)r. L. Cognetti de Maitlis on the 



two small longitudinal stripes, which are interrupted at the 

 intersegmental furrows. The stripes extend on segments 

 xviii. to xxvi. (^ xxvii.) and on segments (| xxxii., xxxiii.) 

 1/rt xxxiii. and xxxiv. They are placed laterally to the lines 

 ot' setse b ; between these lines and stripes are found the 

 paired lateral papillte. Close ventrally to the stripes, for 

 their whole length, are two thin grey bands, which are inter- 

 rupted, as are the stripes, on the space between segments 

 xxvi. and xxxiii. or xxxiv. (PI. XIII. fig. 12). 



In this space the body-depression is greatest, and the lateral 

 margins are quite sharp and expanded to form two fin-like 

 plates, a little undulated, which extend to segments xxvii.— 

 xxxii. or ^ xxxiii. (or xxxiii.), being in the lines of the stripes 

 described above (PI. XIII. hg. 11). Each plate is about 

 1 mm. wide, their margins are parallel, and their ends 

 diminish rapidly in breadth. 



The two stripes, with the adjacent grey bands, are similar 

 to the tubercula pubertatis of some Lumbricidai — lor example, 

 of Octol'isium compianatum (Ant. Dug.) *, — and the tin-like 

 plates correspond to the organs which in other species of 

 Gli/phidrilus have been named by llosa f "tubercula puber- 

 tatis,'' by Horst :|: "clitellar ridges,'^ and by Michaelsen § 

 " Pubert'atstuberkel - Walle," " clitelliale Laiigswiilste,'' 

 " Pubertatssaume.'" 



It seems to me thab these fin-like plates may be regarded 

 as corresponding to those curious appendages which have 

 been described in the Oriodriline genera Alma and Criodrilus 

 under the name of " penes." They are provided, among 

 other things, with a rich vascularization || like the last- 

 named organs. The whole shape is altogether different. 



The nephridial pores are in the lines of setse b. 



I found the male pores only in two specimens. They 

 appear as two point-like d pressions on intersegmental furrow 

 xxix.-xxx. in the lines of setse b. 



The female pores are not visible. 



The small spermathecal pores are distributed in various 

 numbers — to six pairs — on intersegmental furrows xiii.-xiv. 

 to xvi-xvii. On each side they are contained between the 



* See the figure of the clitellar region of this species given by Rosa, 

 (i4)pl. i. IJg. 4. 



t See Rosa, (15) p. 387, pi. xii. fig. 1. 



t See Horst, (5) pp. 38, 76, and pi. ii. fig. 18. 



§ See Michaelsen, (6) pp. 196, 197, 242, and pi. xiii. fig. 1 cw.; 

 (7) pp. 459-461 ; (8) p. 36 ; (13) p. 102. 



II See Horst, (5) p. 89. The structure and development of the " penes " 

 of the Criodrilinse are the subject of a recent paper by me (3 ). 



