WHICH DIED IN THE ZOOLOGICAL GARDEKS. 



925 



posterior border of each segment overlapping the anterior border 

 of the following segment. 



The genital pores are unilateral and protrude somewhat. 



Male reproductive organs. 



The testes are 16-20 in numbei", oval in shape, measuring 

 70-100 p. in their longest diameter. 



In the younger segments they are arranged in a circle round 

 tlie female genitalia. In the more mature segments they are 

 pushed out laterally by the ovaries but still retain a suggestion 

 of their circular arrangement. There is a lai-ge seminal vesicle 

 which lies in the anterior third of the mature segments. In the 

 ripe segments in which the male elements are spent, this vesicle 

 resolves itself into a finely-coiled tube, which is continuous with 

 the vas deferens. 



The cirrus pouch is 1 50 /x long, and opens through a papilla 

 into the genital atrium or cloaca. 



Text-figure 12. 



Cyclorcliida crassivesicula, sp. n. 



A. Mature segment, showing male and female genitalia. 



B. a and c. Ripe fertile segments. 



h. Unfertile segment showing shape of uterus. 



In the mature segments the cirrus is extended ; it measures 

 140 jLt in length and 20 jx in breadth at the base, and is covered 

 with small spines, which are directed backwards. 



Female reproductive organs. 



The two ovaries lie side by side in the centre of the segment ; 

 they are round lobulated organs measui-ing 160/x— 180/z in 

 diameter. 



Between the ovaries a veiy minute shell-gland is situated. 

 Immediately beneath the shell-gland lies a group of yolk-glands, 

 which together form a lobulated kidney-shaped organ measuring 



