30 G- O. Sars. 



each egg- capsule is seen to contain in the centre a com- 

 paratively small, perfectly globular body, surrounded by a 

 very delicate pellucid membrane. This is the egg proper, 

 which is accordingly of very small size, but little exceeding 

 half the diameter of the egg- capsule itself. 



The testes occupy the same place as the ovaries, and 

 are also of a rather similar form. The follicles, however, 

 (see PI. V, fig. 7) are of a more uniform size, aud as it 

 were irregularly twisted. They each contain a cavity, 

 which is in communication with the central hollow, and 

 from their inner walls the spermatic elements are developed 

 in the form of simple small cellular bodies. I have Dot 

 been enabled by dissection to state at which places the 

 vasa deferentia debouch; but in the specimen examined 

 there was found (see PI. V, fig. 3) externally, on each side 

 of the body, just above the bases of the 9th, 10th and 11th 

 pairs of legs, an opaque granular mass, which had much the 

 appearance of being coagulated sperm, which might have 

 been recently poured off from the body. This induces me 

 to believe, that the sexual openings in the male occur at 

 the very same places, where they are found in the female, 

 viz., at the bases of the 11th pair of legs. 



Occurrence.- — Of this beautiful form a rather large 

 number of specimens were collected by Mr. Knut Dahl ou 

 the 3rd November, 1894, from a shallow pool on Mount 

 Showbridge, in the neighbourhood of Port Darwin, North 

 Australia. By far the greater number of the specimens were 

 of the female sex, indeed I only succeeded in detecting 

 among them a single male specimen, the one here described. 

 This would seem to indicate, that the present form may 

 at times propagate in a parthenogenetical manner. 



