ON PARAWIUGIITIA EOBUS'J'A. 199 



tlie body becomes rod-shaped, and is about 1*10 /n. in leno-tii, 

 and 0'50ji{in width (fig-. 10, c.h.) On the division of the central 

 body, one of three events nniy take place : 



(1) The envelope divides, and fission or budding takes 

 place as mentioned above. This may continue a number of 

 times until a cluster of individuals is produced (fig. 8 {2,4,o))- 

 Such occurs only wIumi the capsules are small and consist of 

 but few layers. 



(2) The division ])r()ducts of the central body may each 

 form a centre from which fresh laminated layers originate. 

 In this way a number of separate centres of lamination may 

 be formed inside the original system (fig. 8 (7) and fig. 11). 



(3) The division-products of the central bodies may not 

 start fresh centres of lamination, but may remain stranded, so 

 to speak, in the laminated system of the parent body 

 (figs. 9, 10, 11, s.h., and text-fig. 5 (?) s.h.). In an old 

 capsule such bodies are seen irregularly scattered through 

 the laminations. 



In the case of the female gonophore the capsules may grow 

 to a very considerable size, and may reach a length of 70 ^t or 

 more. The appearance of these structures varies accoi'ding" 

 to the number of centres of lamination. The central bodies, 

 and the bodies stranded in the substance of the capsule, are 

 highly refringent, while the substance of the capsule is per- 

 fectly clear like spun glass, and is considerably refringent. 



The sti-uctures may be spherical with a single central body, 

 or they may be elongated with a row of central bodies along 

 the long axis (PI. XXXIV, fig 10), or they may be lobed 

 with various centres of lamination (fig. 11). In the case of 

 fio-. 9 the structure was bilobed with two centres of lamination. 



In the accompanying illustration (text-fig. 5), the arrange- 

 ment of the laminations and the bodies is shown on a large 

 scale, and consequently more clearly than is possible iu the 

 plate. The cone-shaped figures are wedges taken from 

 various capsules ; the centre of the capsule being situated 

 towards the right hand side of the page. 



Figures 1 to 5 and 7 show the early stages of development, 



