ZooL.— Vol. II.] EISEN-OLIGOCHyETA. I43 



figure we see broad and narrow lobes alternating, while in 

 my specimens all are of the same size, the lobes being 

 broader and regular. 



Sj)erm-dticts. — These are very thick, and are separated 

 to the junction by the prostate. They enter the prostate 

 covering in the vicinity of the apex of the diverticle, run 

 for a short distance inside the covering, and then pierce the 

 main prostate, just in line with the apex of the diverticle. 

 The ducts curve inwardly and enter the prostate in the 

 center of the organ, as seen in a section represented in 

 fig. 47. The two ducts unite only in the glandular part of 

 the prostate. Anteriorly the ducts run forward in a straight 

 line, curving only over the large muscular bursa. 



E;pidermal Sense-cells. — (figs. 95-97). As is well known, 

 many and perhaps all species of the genera of Eudrilidae 

 are characterized by the possession of large epidermal 

 sense-cells, which Beddard has compared to the pacinian 

 bodies of higher animals. He has figured and described 

 these cells (54) in Eudriliis, and any further description 

 would seem to be superflous. But the sense-cells found in the 

 Eudrihts from Panama differ so much from those Beddard 

 describes that it seems likely that we have investigated two 

 different species. Judging from Beddard's papers (54, figs. 

 2 and 3; and 62, fig. 14) it appears as though the structures 

 of the various cells composing the so-called pacinian body 

 do not differ much from each other. In fig. 14 we find a 

 large central nucleus surrounded by a rather small cell, 

 around which are seen a number of thin concentric cells 

 with nuclei of much smaller size than the central one. 

 This is the case in Beddard's species from Guiana. In my 

 Panama specimens, the sense-cells are situated exactly as 

 described by Beddard, at the base of the epidermis; they 

 never reach more than about half-way up to the cuticle. 

 The sense-corpuscle is surrounded by ordinary glandular 

 and supporting cells, which shut off the former from the 

 cuticle. In a general way the sense-corpuscles may be 

 described as consisting of a very large central cell, which is 



