1901.] or THE GENUS BENHAMIA. 213 



The two pairs of sperynaihecce occupy the usual position that 

 characterize this genus. The anterior pair of pouches are rather 

 the smaller. Each consists of a roughly spherical pouch which is 

 almost sessile upon the body-wall ; external diverticula are not 

 visible. But a microscopical examination shows a cavity filled with 

 sperm within the walls of the organ. 



(6) Benhamia michaelseni, n. sp. 



Of this species, also new, which comes from the same locality 

 as the last, I have had but a single specimen for examination, 

 which proves, however, to be fully mature. It measured 200 mm. 

 in length by 5 mm. in diameter. It is thus of much the same 

 size as the last, and has B. hudgetti, B. heddm-cU, and B. liorsti 

 among its nearest allies. 



• The setcp^ w-hich show the usual paired arrangement, are smaller 

 upon the first few setigerous segments and gradually increase in 

 size up to the fifth (setigerous) segment. A distinct ornamention 

 can often be traced in the form of transverse rings. 



The genital area is much more deeply sunken than in the last 

 species. The arrangement of the genital papillce is also different. 

 But in B. michaelseni, as in B. gambiana, the seminal gutter i^ 

 straight. The only two genital papilloi that I could find are situated 

 respectively on the border-lines of segments xxi./xxii. and xxii./xxiii ; 

 each papilla is small and round and perfectly obvious ; it lies 

 exactly in the middle ventral line of the body. In the neighbour- 

 hood of the male pores the integument is swollen here and there 

 into papilla-like outgrowths ; but I do not put these down under 

 the category of papillte, since they are not so plain and uu mistake- 

 able as are those which I have just described. Where the area 

 surrounding the male pores is depressed, there are usually such 

 inequalities in the surface of the integument. These naturally 

 produce, as they do in the present species, a chequered surface 

 upon the cuticle when this is viewed after having been stripped off 

 from the body. 



In its internal structure this species does not offer many 

 differences from B. gambiana or B. budgetti, except in the sculp- 

 turing of the penial setae. The gizzards, however, seem to me to 

 be in vi. and vii. instead of v. and vi. The calciferous glands 

 are in xiv., xv., and xvi., and, as in other species, the first pair are 

 smaller and of a smoother contour than those which follow. The 

 large sperm-sacs are in xi. and xii. There are two pairs of funnels. 

 The spermiducal glands are decidedly larger and more coiled than 

 in B. gambiana. The penial setoe, are of quite a different pattern, 

 as may be seen from a comparison of the drawings (text-figs. 16-19, 

 pp. 205-214) exhibited. In the present species, as in the last, 

 each sac contains two setae which are curved in form. They are 

 nearly twice the size of those of B. gambiana and measure 2 mm. 

 The end is not much hooked and ends in a rather blunt termination. 

 A large part of the distal portion of these setae is beset with 



