BY J. J, FLETCHER, M A., B.SC. 397 



this way occupying vi and part of vii ; in each segment from viii 

 to XIV the alimentary canal shows a globular dilatation, very 

 vascular, probably functioning as calciferons glands, though lateral 

 diverticula are not visible ; the portions of the intestine in xv-xvii- 

 are very thin-walled ; the large intestine suddenly commences in 

 XVIII, and is without caeca. 



Mesenteries : a thin incomplete one between iv and v, a com- 

 plete but very thin one between v and vi, the next one thicker, 

 the followins; seven as far back as the one between xiii and xiv 

 very much thicker, the remaining ones very thin. 



Genitalia : two pairs testes, in xi and xii, narrow elongate 

 racemose or lobulated white bodies attached to the posterior faces 

 of the mesenteries between x and xi and xi and xii, one on each 

 side of the intestine, quite independent of each other ; ciliated 

 rosettes in x and xi, quite free and unenclosed in any sacs (from 

 other considerations the specimen dissected was evidently not 

 breeding), the posterior portions of the vasa deferentia not 

 discernible ; prostates a pair of long narrow rather flat bodies 

 transversely disposed in xviii, with a thick short genital duct 

 coming off from the inner (lower) end ; just in front and for some 

 distance behind the genital duct the floor of the body shews white 

 elevations, accessory copulatory glands : the ovaries occupy the 

 usual position in xiii ; the oviducts not determinable the worm 

 being in rather too soft condition ; spermathecas three pairs, in 

 vii-ix, stalked pouches, opening anteriorly, the posterior pair the 

 largest, each with a small but conspicuous club-shaped caecum 

 nearly as long as the stalk of the principal pouch. 



The last pair of hearts is in xiil ; from viii-xiil a second supra- 

 intestinal longitudinal vessel is apparent, from Avhich in part arise 

 the four posterior pairs of hearts. Very minute tufts of tubules 

 attached to the ccelomic wall appear to represent the segmental 

 organs. 



As in P. canaliculata in the specimen dissected there was a pair 

 of symmetrically-placed stalked bodies on the posterior surface of 



