404 IL inois State Lahoratory of Natural History. 



The first pair of nephridia is in VII, and the nephrid- 

 iopores are situated in front of the ventral setse. Al- 

 bumen glands are wanting. 



The reproductive organs of this species are in some 

 respects quite remarkable. One of the specimens had 

 these organs well developed ; the other had passed the 

 stage of sexual activity, but still had most of the or- 

 gans present, though reduced in size. One pair of testes 

 is present in X. The male efferent apparatus is developed 

 upon only one side. The male pore is upon the mid- 

 ventral line in the posterior part of X (Pi. XXXVI,, 

 Fig. 7). As this condition exists in each of the speci- 

 mens, it cannot be ascribed to individual abnormality. 

 The funnel of the sperm-duct is in the posterior part of 

 X. I have been unable to trace the part of the sperm- 

 duct connected with the funnel, but the distal part has 

 peculiarities of structure closely allying it to the similar 

 organ in E. frigidus. An enlarged reservoir extends 

 through XII-XIV {res.. Fig. 7). It has a thick wall 

 consisting of a thin epithelial layer and a thick layer of 

 longitudinal muscular tissue. Outside of the muscular 

 layer is a layer of small deeply-staining cells, which in 

 some places are scattered. This layer is nowhere more 

 than one cell in thickness. The reservoir is not con- 

 stricted by the septa of the somites through which it 

 passes. Surrounding the reservoir, and connected with 

 it, is a thick layer of tissue of a reticulate character, which 

 is constricted by the septa. The posterior end of this 

 reservoir ends blindly, while the anterior end is contin- 

 uous with a smaller tube which extends forward and in- 

 ward as far as the middle of XI, and then, making an 

 abrupt turn outward, passes posteriorly half way to sep- 

 tum XI I XII, where, with another abrupt turn, it ex- 

 tends anteriorly and is continuous with a larger portion 

 of the duct corresponding to the "prostate and atrium" 

 of E. frigidus. The part of this enlarged portion which 

 is situated in XI {pr., PI. XXXVI.. Fig. 7). and which be- 



