1901.] OP THE GENUS BENHAMIA. 211 



earliest. Thus those of xv./xvi. are quite in contact, and finally 

 the last pair, those on the intersegment xix./xx., ai-e farther apart 

 than are the ventralmost setae of the neighbouring segments. 

 Papillae with the arrangement just described were only found in 

 one example; in another the intersegment xv./xvi. bore but a 

 single median papilla which was followed by only two pairs, i. e. 

 intersegments xvi./xvii. and xix/xx. A third example had still 

 fewer papillae, the anterior pair or single papilla, as the ease may 

 be, having disappeared. In this specimen there are, therefore, 

 only two pairs of papillae. 



I observed that the ovichical pores lie on a level with and to the 

 inside of the ventralmost seta of each side. The male pores and 

 the spermatlieccd pores correspond in position to the ventral pair 

 of setae. 



In a third individual, which was rather more contracted in the 

 clitellar region, the papillae have become also contracted and look 

 like half-closed eyes lying between segments xv./xvi., xvi./xvii., 

 and xix./xx. They are not obvious, and might be missed by any- 

 one who had not seen them in a more fully expanded worm. 



The dorsal pores of this species, as of B. budgetti, are by no 

 means plain. They appear to be quite absent in front of the 

 clitellum, and behind the clitellum I could only see them hj 

 examining microscopically pieces of stripped-oif cuticle. The 

 condition of the dorsal pores in this species shows how careful 

 one should be in stating the absence of these structures. The 

 internal anatomy of this species shows very few characters of 

 difference from its allies. The two gizzards are separated from 

 each other by a considerable tract of soft-walled oesophagus ; 

 there is not that close connection between the two gizzards that 

 obtains in some other species — for instance in Benliamia johnstoni. 

 The position of these gizzards is perfectly plain in one specimen ; 

 they lie in the vth and vith segments. In others it appeared to 

 me that the vith and viith segments were those occupied by the 

 gizzards ; but in view of the very clear appearances shown in the 

 individual (that with a contracted clitellum) where they were to 

 be relegated to segments v. and vi., I imagine that the thin 

 septum dividing segments vi. and vii. had escaped my attention. 

 The calciferous glands lie in segments xiv., xv., xvi., as in many of 

 these West- African species of the genus. The anterior pair were 

 smooth and smaller than the others, whose superior surface is 

 broken up by a few transverse grooves ; the shape of the glands 

 is that of a segment of an orange, the top being flat. I have not 

 ascertained whether they open separately into the oesophagus or 

 by a common duct. The intestine begins in segment xix. It is 

 noticeable that when the calciferous glands are in .segments xv., 

 xvi., xvii., the commencement of the intestine is at least sometimes 

 not thrown a segment farther back. 



The dorsal vessel is single, and the last hearts lie in segment xii. 

 The sperm-sacs are large and lie in segments xi. and xii. There 

 are also two pairs of sperm-duct funnels which are in x. and xi, 



14* 



