92 WILLIAM BLAXLAND BENHAM. 



they pass through the septa the sacs are greatly constricted ; 

 so much so in one specimen that the reservoir on one side is 

 cut in two, as not unfrequently happens in Lumbricus. 



In another specimen the reservoirs are present, but are empty, 

 and are not of so great an extent as in the one figured. 



The ciliated rosettes (/) lie in somite xi, one on each 

 side of the intestine ; they are not enclosed in the reservoirs 

 in front of which they are placed. This arrangement is very 

 similar to the condition found in Urochseta. 



The single sperm-duct on each side is very delicate; it 

 passes backwards along the body wall to its aperture in 

 somite xxii, without having any accessory glands in connection 

 with it. 



I could find no testes, nor ovaries nor oviducts. The sper- 

 mathecse are six in number {d), a pair lying in each of the 

 somites vi, vii, viii, and having their apertures in the posterior 

 region of these somites. Each is a simple elongated pyriform 

 sac (fig. 29), bent twice upon itself. 



The nephridia occur in each somite behind the second. 

 Each consists of a coiled tubule (fig. 27), which is of much 

 greater extent than in Urobenus, and contans parallel lumina 

 within it, having the usual structure. The tubule opens into 

 the coelom by means of a funnel similar to that of Urobenus; 

 the proximal end of the tubule alters its character before pass- 

 ing to the exterior, the lumen becoming wider and the walls 

 muscular, as in Lumbricus; but here this vesicular region 

 is more highly developed than in that form, which, however, it 

 resembles in that the vesicle is a continuation of the tubule, 

 and not a diverticulum from it, as in Urobenus and Micro- 

 chseta. The nephridiopores have already been mentioned as 

 being in a line with seta 4. 



As is so frequently the case, the most anterior nephridium 

 is greatly modified. Resting against the hinder part of the 

 pharynx in somites iv and v is a large, compact, glandular- 

 looking organ (fig. 26, c), the slightly-coiled duct of which opens 

 to the exterior on the anterior edge of somite iii. The glan- 

 dular-looking portion of this modified nephridium is made up 



