36 



The first dorsal pore lies in the intersegmental groove V/VI or 

 VI/ VII; on the clitellum neither pores nor intersegmental grooves are 

 visible. The clitellum occupies segments XIII — XX, the first of 

 them being very obvious. The prostate-pores on segment XVII 

 and XIX, are connected on each side by a longitudinal oval groove; 

 both grooves are surrounded by a distinct rectangular area, which ap- 

 pears somewhat elevated (PI. II. fig. 11). In some specimens this area 

 was interrupted in the median line. The space between the ventral 

 setae of the posterior clitellar segments looks not glandular. 



The setae are arranged in four couples; they have the ordinary 

 shape and are also visible on the clitellum. The distance between a 

 dorsal and a ventral couple is about equal to that between the two 

 ventral couples. 



There are four fascicles ofpenial setae, containing each a couple 

 of them, with their reserve- bristles. The setae of each couple have a 

 different appearance (PI. II. fig. 12). In the longer one the distal 

 extremity is ornamented with four faint thorny processes and its tip 

 is hook-shaped; the smaller one has the extremity spoon-like dilated. 



The spermathecae (PI. II. fig. 13) have not such an oblong shape 

 as those of B. floresiana ; they too are divided by a constriction in two 

 compartments, the superior of which bears a small diverticulum. 



The buccal region of the alimentary canal (in front of the cerebral 

 ganglia) is furnished dorsally with a rather broad, flattened diverticu- 

 lum, lined with an epithelium, which differs from the epithelium of 

 the remaining portion of the buccal cavity; its cells are not only 

 broader than the ordinary buccal cells, but contain a granular proto- 

 plasma, giving them a glandular appearance. The cells on the floor 

 of the pouch are shorter than those of the roof, and resemble the 

 glandular cells of the hypodermis. 



Michaelsen already observed such a diverticulum in B. Bolavi l ). 



This pouch is not to be confounded with a diverticulum of the 

 pharynx, as that observed by Michaelsen and Beddaed in several 

 Acanthrodilus-species , and recently described by Benham in Emino- 

 drilus 8 ) ; according to this author's observations it is usually ciliated 

 in its dorsal part. 



1) Jahrb. der Hamburg. Wissensch. Anstalten, VII, 1801, p. 9. 



2) Jouru. of the R. Microsc Society, 189], p. 161, pi. 3 and 4. 



