296 Transactions. — Zoology. 



13th or at the commencement of the 14th segment. The blood 

 appears to have been reddish in life. 



In segments 10 and 11 there are great lobulated masses 

 attached to the body- wall at the insertion of the septum 10/11, 

 some lobes passing forwards and even reaching into the 9th 

 segment, others backwards. This is the " multiple testis " (of 

 Claparede) ; but, as Michaelsen has shown, it is only "testis" 

 at its base — towards the extremities of the lobes the sperm 

 mother cells are found dividing up, and various stages in sperm- 

 formation occur. 



The tub-shaped sperm-funnel (Plate XIV., fig. 13) in the 11th 

 segment has a length equal to about twice its breadth. The 

 narrow sperm-duct coils considerably immediately after passing 

 through the septum 11/12, then takes a straight course to the 

 " penis." This consists of a spherical mass of gland-cells enclosed 

 in a thin muscular coat, consisting of circular and longitudinal 

 muscles. Some of the gland-cells open directly to the exterior, 

 others into the sperm-duct as it passes through the apparatus. 

 The sperm-duct arrives at the outer side of the " penis," which 

 it perforates obliquely to open externally at its centre. The 

 area of the body-wall over which the gland-cells open is, in 

 the specimen sectionised, retracted, so that a deep narrow pit 

 results. 



The ovary, like the testis, is " multiple " — i.e., lobulated — 

 each lobe being moniliform, consisting of strings of ova, while a 

 few large ova lie free in segment 13. 



The oviducal pore is visible on the mounted specimen at the 

 junction of segments 12/13. 



The spermatheca has the usual position, opening, that is to 

 say, between segments 4/5. It (Plate XIV., figs. 11, 12) is a 

 cylindrical tub-shaped sac, with a sharply constricted, very short 

 duct which is surrounded by a circle of gland-cells. At the 

 opposite end of the sac a narrow tube puts it into communica- 

 tion with the oesophagus. 



The nephridia have a small pre-septal portion, and a large 

 post-septal region whence the duct passes from the hinder end 

 to the body-wall, usually bending forward below the rest of the 

 organ. 



There are three subneural (? copulatory) glands — two large 

 ones in segments 14 and 15, and a smaller one in the 16th segment. 



In transverse section it is seen that the gland (Plate XIV., 

 fig. 8) rises up the sides of the nerve-cord and leaves the greater 

 part of its upper surface uncovered. Each lobe is of considerable 

 size — at least four or five times the diameter of the nerve-cord — 

 and extends laterally as far as the ventral chsetae. The ducts 

 — i.e., necks — of the gland-cells pass through the circular raus- 



