366 FRANK E. BEDDARD. 



the descriptions of Rosa and others. In every particular my 

 specimen agreed with the descriptions given by those authors. 

 The first dorsal pore lies between segments 4 and 5, opening 

 of course into the latter segment. 1 The most important point 

 mentioned hitherto among the external characters of Allurus 

 is the forward position of the male reproductive apertures and 

 the clitellum ; the former are upon the 13th segment, the latter 

 extends from Segments 22 — 27. 



Anatomy. — The single specimen at my disposal was care- 

 fully prepared for histological purposes; the anterior region was 

 investigated by means of longitudinal sections ; the clitellar 

 region was studied by a continuous series of transverse sections. 



Reproductive Organs. — The testes are two pairs 

 (PI. XXV, fig. 2 t) ; they are situated on the anterior me- 

 sentery of Segments 10 and 11; they correspond, therefore, 

 in number and position as well as in structure to the testes of 

 Lumbricus and many other genera. 



The seminal reservoirs (fig. 2 v. s.) occupy Segments 

 9, 10, 11, and 12. The two anterior pairs are smaller than the 

 two posterior, and are attached to the hinder septum of their 

 segment; the posterior pairs of seminal reservoirs are attached 

 to the anterior wall of their segment. 



The disposition of the vesiculse is, in fact, precisely that of 

 Allolobophora 2 and of Criodrilus; 3 as in those genera 

 the funnels of the vasa deferentia float freely in their seg- 

 ments (10 and 11), and are not in any way enclosed by the 

 seminal reservoirs. 



The vasa deferentia unite in the 11th segment to form 

 a single tube with the usual structure, which opens on to the 

 exterior in Segment 13. The termination of the vas deferens 

 is stated by Rosa to be furnished with an atrium, confined to 

 the 13th segment. The body which Rosa terms an "atrium" 

 does not appear to me to be really comparable to an atrium; 



1 ' Ude (' Zeitschr. f. wiss. Zool.,' 18S5, p. 139) states that the first dorsal 

 pore is between 3 and 4. 



2 Bergh, 'Zeitsch. f. wiss. Zool.,' 1886, p. 314. 



3 Benham, this Journal, 1887, p. 567. 



