220 DE. W. B. BENHAM ON 



and the moutli is surrounded by a white ring at the anterior 

 part of segment i. 



A dark streak traverses the mid-dorsal line, behind the eli- 

 tellum, indicating a dorsal gap in the ring of chaetse. 



There is nothing to note in respect o£ the male pores, which 

 are separated by 16 chaetse. There are no special copulatory 

 structures ; but the worm was not fully mature, although prob- 

 ably fully grown. 



There are four pairs of spermathecal pores at the anterior 

 margins of segments vi. to ix,, with about 20 chsetse between. 



The first dorsal pore is between segments xii./xiii., but is 

 small. 



The ring of clicetcs is not complete, there being a dorsal gap 

 equal to about twice the normal interchsetal space ; but there is 

 no perceptible ventral gap. The chaetse, though showing no 

 difference in size, are closer together ventrally than dorsally ; 

 they number 



36 in segment ii. 

 56 „ T. 



56 „ X. 



66 „ XX. 



60 „ XXV. ' 



Internal Anatomy. — There are no remarkably stout septa, 

 though the four following the gizzard are thicker than the rest. 

 The cylindrical gizzard lies in segments viii. and ix., i. e., there 

 is a portion of oesophagus between it and the septum x./xr. 

 The caecum is slightly notched on its ventral surface. 

 The sperm-sacs present a slight peculiarity, which I do not 

 remember to have noticed before ; there is a pair in each of the 

 segments xi., xii. ; the " Samenblasen," as usual, being in seg- 

 ments X., XI. Each sperm-sac (PI. 16. fig. 5 c) is constricted into 

 a larger ventral and medial portion, and a smaller, round, outer 

 portion, which is provided dorsally with a narrow, pointed, finger- 

 shaped prolongation (/"), quite suddenly and distinctly separated 

 from the rounder sac. 



The four pairs of spermathecae, which are all alike, lie in 

 segments vr. to ix. : each is a pyriform sac (fig. 5 h), with a short 

 wide duct, into which opens the duct of the diverticulum : this 

 terminates in a globular swelling. 



The spermiducal gland (PI. 16. fig. 5 a) is nearly square and 

 occupies segments xvi., xvii., and xviii. Its margin is greatly 



