562 E. C. PUNNEi'T. 



described^ and throws doubt on the homology of that organ 

 throughout the group. 



4. The presence in a Heteronemerteau of rhyuchocoelomic 

 pouches comparable to those of Drepanophorus among the 

 Metanemerteans. 



5. The arrangement of the median dorsal nerve in Oxy- 

 polia is peculiar, as it runs for some way outside the ex- 

 ternal longitudinal muscle layer. 



6. A comparison of Oxypolia with the other genera of 

 the Eapoliida3. 



Bibliography. 



1. WcIntosh, W. C. — ' Biilish Amielitla : I lie NeiiieilcjiiKs' 1873-74. 



2. OuDEMANS, A. C. — " The Circulaloiy and Nepliridial Appaiatiis of the 



Nenieitea/' 'Quart. Jouin. Micr. Sc.,' vol. xxv, Suppl., 1885. 



3. JoUBiN, L. — " Reclieichcs siir Ics Turhellaires ties Cotes de France," 



' Archiv. de Zoologie,' torn, viii, 1890. 



4. Co£, W. — " On the Anatomj of a Species of Neiiieiteaii, etc.," ' Trans. 



Connecticut Acad.,' vol. ix, 1895. 



5. Burgee, O. — "Die Neniertinen," ' Naples Mono^'iapli,' 1S95. 



6. MoNTGOMEiiy, T. H. — "On the Connective Tissues and Body-cavities of 



the Nemerteans," 'Zool. Jaliib.,' Bd. x, 1897. 



7. Thomson, Cakoline B. — "Preliminary Description of Zygeupolia 



littoralis, etc.," ' Zoologischer Anzeiger,' Bd. xxii, 1900. 



8. PuNNETT, 11. C. — " On a Collection of Nemerteans from Singapore," 



' Quart. Journ. Micr. So.,' vol. 44, 1900. 



9. PuNNETT, R. C. — " On some Nemerteans from Torres Straits," ' Proc. 



Zool. Soc.,' 1901. 

 10. PuNNETT, R. C. — "On some South Pacific Nemertines collected by Dr. 

 Willey," ' Willey's Zool. Results,' PI. v, 1900. 



