204 SPOLIA ZEYLANTCA. 



Rhincalanus gigas, Brady. 



(?) Rhincalanus gigas, Thompson, 1899, p. 276. 

 Rhincalanus nasutus, A. Scott, 1902, p. 401. 



— — Cleve, 1903, p. 368. 



— Thompson & Scott, 1903, p. 242. 



_ Cleve, 1904, p. 196. 



Wolfenden, 1905, p. 996. 



Rhincalanus gigas, A. Scott, 1909, p. 24. 



There is some doubt whether Rhincalanus gigas, Brady, and 

 Rhincalanus nasutus, Giesbrecht, are synonj^mous. The 

 differences that distinguish them are, apart from size, which 

 per se cannot be regarded as a specific character, of a trivial 

 character, and I am inclined to agree with Scott {loc. cit., 

 1909) that they are merely forms of one species. Several 

 examples of the form corresponding to R. nasutus were 

 obtained on the pearl banks. 



Genus Mecynocera, Thompson. 



Mecynocera clausi, Thompson. 



Mecynocera clausi, A. Scott, 1902, p. 422. 



Cleve, 1903, p. 364. 



Thompson & Scott, 1903, p. 242. 



A. Scott, 1909, p. 25. 



Although by no means common, several examples were 

 obtained, all of which proved to be females. 



Genus Paracalanus, Boeck. 



Pabacalanus aculeattjs, Giesbrecht. 



Paracalanus aculeatus, Giesbrecht, 1888, p. 333. 



Giesbrecht, 1891, p. 282. 



Giesbrecht, 1893, p. 164. PI. IX., 



figs. 20, 26, 30. 

 Paracalanus 'parvus, T. Scott, 1894, p. 26. PI. I., figs. 9-14. 

 Paracalanus aculeatus, Dahl, 1894, p. 12. 



