228 



DR. W. B. BENIIAM ON 



[Nov. 15, 



extending from h-b, and in the pi-echsetal portion of the 16th 

 segment a pair of similar glands, which perhaps represent tubercula 

 pubertatis, but they are not well-defined. 



The two oviducal pores are visible in the usual segment, in front 

 of the chfetal space a/h. 



The species possesses a single pair of spermathecae which open 

 between segments 8/9 ; each pore has a very prominent pale 

 yellowish lip in front and behind, in line he : further, on each of 

 the segments 9 and 10 is a round, pitted tubercle in front of 

 chseta h on each side. 



The ')iephridio2Jores are in line d. 



Dorsal jiores are verj^ evident, and commence behind segment 6, 

 continuing to the last segments of the body. 



Interned Anatomy. 



There are no noticeably stout septa. 



The dorsal vessel is double right up to the pharynx (as it is in 

 Dinodrilus) ; the last of the four pairs of hearts is in segment 13, 

 and of considerable size. 



The gizzard is very feebly developed in segment 6 ; the 

 oesophagus is dilated in segments 14, 15, 16, but no definite 

 gland is formed. 



The intestine commences in segment 18. 



The worm contrasts with Dinodrilus in being meganephric ; and 

 in the mid-body, at any rate, the lai-ge muscular duct is easily 

 traced, under a dissecting-lens, to the body- wall, which it pene- 

 trates in line of chseta d to open to the exterior. 



The Ueproductive system. — There are two pairs of testes and 



Text-fi2-. 47. 



Dinodriloides heddardi. — Spermatheca, enlarged. 



funnels in the usual segments. The two pairs of sperm-sacs are 

 in segments 11, 12 ; of small size, and botryoidal (or racemose) in 

 form. There is but a single pair of spermiducal glands, which 

 are thorouglily Acanthodriline in form, each being cylindrical and 

 compactly convoluted to form a mass of considerable size, provided 

 with a short narrow muscular duct. 



