ONYCHOPHOEA OF WEST AUSTRALIA. 381 



The Ne-phridia of the ith and 5ih pairs of legs (PL I. fig. 2, 

 ISTepb.'). These nephridia difter from the others firstly in the 

 increased length of the tnbe between the distal collecting vesicle 

 and the opening on the leg. This is due to the fact that the 

 renal aperture is situnted near the extremity of the appendage. 

 The vesicle presents the same structure as before. From the col- 

 lecting vesicle a long, tubular portion extends posteriorly within 

 the lateral compartment of the body. This section presents the 

 same type of wall as the corresponding section of the other 

 nephridia. Having reached somewhere about the second Suc- 

 ceeding pair of legs the tube turns on itself and runs forward, 

 the two limbs being in close contact. The wall still presents the 

 large flattened cells. This section passes into the ciliated duct, 

 Avhich is particularly well marked in these nephridia, and opens 

 into the coslomic chamber, which lies close to the distal collecting 

 vesicle. 



The Reproductive Organs. 



A somewhat detailed description of the rej^roductive oi;gans of 

 the West Australian Ferlpatoides is rendered necessary owing to 

 the fact that Bouvier's specimens of the northern variety were 

 not sufficient to allow of a complete and accurate account of the 

 anatomy. This applies in particular to the female, in which con- 

 nection Bouvier states (3) "L'appareil genital fenielle ne presente 

 rien de particulier, si ce n'est Vatrophie complete, pit a pen pres 

 complete^ des receptacles seminaux." The receptaculum seminis 

 is, however, well developed. The explanation of the mistake 

 probabl}^ lies entirely in the state of preservation of the few 

 specimens available. We have had the good fortune to obtain 

 many specimens and to preserve them in many ways. 



The Male Rein-oductive Organs consist fi'st of the two testes, 

 which lie fairly far forwards entangled amongst the diverticula of 

 the slime glands (see PI. I. fig. 3, Tes.) and dorsal or lateral to 

 the alimentary canal. These organs are tubulai and from the wall 

 cells are cut oti' which are apparently the spermatocytes. These 

 do not develop into sperinatoxoa in the testes. Apparently the 

 dsvelopmeitt of spermatozoa takes place in the vesicida seminalis 

 (see Photomicrograph, PI. III. fig. 14). 



This feature is to my mind rather interesting; yet it is one 

 which is never mentioned in text-books. It was naturally 

 thought at first to be quite a new discovery. As a matter of fact 

 it was seen by Gaflron many years ago and figured in his work (8). 

 GaflVon was strvick also by the resemblance to the conditions in 

 the earthworm and actually writes: " Etwas sehnliches findet 

 sich bekanntlich beim Regenwurm, wo ja auch die eigentlichen 

 Hoden den ' Samenblasen ' gegeniiber sehr zurlicktreten und die 

 Weiterentwicklung der 8permatozoen in letzteren stattfindet." 



Each testis opens into a seminal vesicle (PI. I. fig. 3, S.V.), 

 one usually lying somewhat in front of the other owing to the 



