BenhaM. — En rth iriirm.^ from Stephen Ishiiid and D'J^rrilh Iddiid. 39 



The oesophageal pouches or glands are four pairs, in segments 10, 11, 

 12, and 13: each is a subglobular outgrowth marked by a series of 

 vertical lines which indicate the attachment of internal folds or lamellae. 

 They are quite lateral in position and do not overlap the gut. 



The mtestine commences in the 18th segment. 



The gonads occupy the usual position on the hinder face of the septa 

 of their respective segments, inserted close to the attachment of the septa 

 to the body-wall. The prostates are as yet very small but quite distinct 

 under a lens, and are of the usual form ; the muscular ducts are recurved. 

 There are no penial sacs, and at present no transverse muscles in these 

 segments such as are present' in the mature stage of the other species. 



The spermathecae occupy the usual position : each consists of a pointed 

 ovate sac, or " ampulla," with a short stout duct, into the anterior face 

 of which opens a bifid diverticulum, the free ends of which lie at the right 



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Fig. 6. — Peneodrilus durvilleanus. Spermatheca. The dotted circles on the 

 diverticula indicate the chamberlets, which are visible only when the 

 organ is cleared. 



Fig. 7. — P. durvilleanus. The left side of segments 8 and 9, showing the 

 spermathecae, nephridial tuft and its lateral extension, and in the latter 

 segment the sperm-sac (s). The median line is towards the right side. 



Fig. 8. — P. durvilleanus. The left half of segments 12 and 1.5, showing the 

 gradual dissolution of the nephridial tuft and its extension dorsalwards. 



and left sides of the ampulla (fig. 6). Externally they appear simple, 

 but when mounted and viewed as transparent objects the internal 

 chamberlets are visible. In this condition the diverticulum appears as 

 a semicircular collar round the duct, much as I have figured it for 

 P. ricardi (5) ; but seen in the animal the distinctness of the two long 

 processes of the diverticulum is very evident. 



There are four pairs of sperm-sacs, in segments 9, 10, 11, 12. 

 The two anterior sacs have at present the form of long white slender 

 cylindrical tubes resting against the hinder septa of the segments (fig. 7) ; 

 each terminates upwards in a rounded end, and is attached ventrally to 

 the septum close to the body-wal- and nerve-cord. The two posterior 

 sacs are shorter, wider, and lie along the anterior wall of their segments 

 (fig. 8) : in short, they have the usual position, but are at present only 

 commencing to form. 



