420 



NEMATODES OF THE 6ENUS PHYSALOPTERA, IV., 



host. Although in such a damaged condition, the specimen shows features 

 sufficiently distinctive to enable it to be characterised as a new species. It is 

 remarkable for the stoutness of the body and the great length and width of the 

 oesophagus. The oesophag-us is actually longer than in any species hitherto 

 described, and if the four fragments (measuring together 24 mm.) represent the 

 total length of the body, the length of the oesophagus relative to that of the 

 body is also exceptionally great. The worm has been torn or cut across trans- 

 versely, and the internal structures have been pulled out of position, and project 

 from the ends of each fragment in such a way that it is not possible to deter- 

 mine with certainty how they connect with each other, but as far as can be 

 judged, they represent the full leng-th of the specimen. Uteri filled with eggs 

 containing well-developed embryos extend up parallel with the oesophagnis nearly 

 to the head, and far posteriorly. Eggs are found crowded into the tail region 

 behind the anus, but have probably escaped into the body cavity from the rup- 

 tured uteri. Pour uteri are present, almost emptied of contents through the torn 

 ends. The terminal portion of one, with the receptaculum seminis, oviduct and 

 ovary, is still attached to the body; the same portions of the other three are 

 detached, and lie free in the alcoholic preservative. The vulva is 1 mm. distant 

 from the anterior end of a piece of the body separate from that containing the 

 oesophagus, and a broken uterus projects anteriorly 5.2 mm. from the same 

 end. Assuming that this piece of the body is the one next behind the oesophagus. 



Figs. 10-16. Physaloptera clelandi, n.sp. 



10. Side view of lip, showing external labial tooth, and buccal pad (x 190) 

 11. Internal view of lip (x 190); 12. Junction of oesophagus and intestine (x 30) 

 13. Posterior end of female body (x 15) ; 14- Terminal portion of female genital 

 system (x 27); 15. Receptaculum seminis and oviduct (x 27); 16. Eggs (x 290) 



the distance of the vulva from the anterior extremity is 6.7 mm., but if, as is 

 more probable, it is the third piece, the distance is 12.5 mm. 

 Specific diagnosis. 



Male unknown. 



Female. Body very robust, opaque, thickset, cuticle very tough and thick 

 (80^), covered with a fine transverse striation. Lips large, external labial tooth 



