BY E. J. GODDARD. 781 



traces of a representative of the same in connection with the 

 dorsally situated chamber of the left side. 



Female organs. — The ovaries are present in segment xii., as a 

 pair of pyriform structures attached by the broad end to the 

 anterior wall of that segment in its dorsal region, and in close 

 proximity to the free distal extremity of the spermiducal gland. 

 Numerous masses of maturing ova are found floating freely in 

 the cavity of that segment, and these show, in their development, 

 a great similarity to those of the Enchytrceidce. , 



In segment xiii., there is, in attachment to the anterior wall 

 on each side of the body, a sac, mentioned previously, into which 

 open the funnels of the spermathecal ducts. No communication 

 between these sacs and the cavity of segment xii., could be 

 detected, although it seems evident that it represents the egg- 

 sac. Each sac passes ventrally into an oviduct, to open at the 

 anterior end of segment xiii. The structure of the wall of the 

 oviduct is essentially the same as that of the ovisacs, consisting 

 of a flattened epithelium, external to which is a layer of 

 longitudinal fibres. 



As in Phreodrilus subterraneus, etc., it is evident that the 

 spermatozoa and ova do not mature at the same time. One finds 

 spermatophores present in the spermathecse, and evidently 

 derived as a result of copulation, inasmuch as the organism is 

 provided with what must be a protrusible penis. No ripe ova, 

 however, were found in segment xii., nor any trace of the same 

 in the egg-sacs. As it appears that copulation does take place, 

 the spermatozoa must be transferred from another individual 

 to the oviducts, thence passing up through the egg-sac to the 

 funnels of the spermathecal ducts, and thence backwards to the 

 spermathecal sac, from which they are later transferred, again to 

 the egg-sac, when the ova are matured, so that fertilisation 

 would readily take place in the egg-sacs. 



ASTACOPSIDRILUS FUSIFORMIS, Sp.nov. 



This species is to be found very abundantly on the surface of 

 Astacopsis serratus, occurring in the grooves of the carapace. It 

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