SURFACE COPEPODA OF THE GULF OF MANNAR. 205 



Paracalanus actUeatus, Giesbrecht, 1896, p. 318. 



Giesbrecht & Schmeil, 1898, p. 24. 



Cleve, 1901, pp. 8 and 47. PI. VI., 



figs. 1-10. 

 Acrocalanus pediger {^ only), Cleve, 1901, p. 35. PI. I., 



figs. 15-20. 

 Paracalanus aculeatus, A. Scott, 1902, pp. 402 and 423. 



Cleve, 1903, p. 366. 



Cleve, 1904, p. 194. 



Wolfenden, 1905, p. 998. PI. 



XCVI., figs. 12-15. 



: Sars, 1905, p. 2. 



Paracalanus clevei, Carl, 1907, p. 7. 

 Paracalanus aculeatus, A. Scott, 1909, p. 26. 



Pesta, 1912, p. 44, fig. 4. 



Sewell, 1912, pp. 326 and 358. 



Pesta, 1913, p. 31. 



As the above synonymy sufficiently indicates, considerable 

 confusion has arisen as regards this species, which was first 

 described by Giesbrecht in 1888 from the female only. 



The first record that I can find in the literature of the 

 occurrence of male examples is that by Dahl (1894), but gives 

 no description or figures. Cleve (1901) in the account of his 

 investigations on the Malayan Plankton describes a male 

 form, but from his description it is quite obvious that the 

 specimens before him were immature, and had not adopted 

 the final sexual characters. In the same paper, however, he 

 has descri})ed a new species of Acrocalanus under the name 

 A. pediger. In his description he gives a detailed account of 

 the structure of both male and female forms, and his conclu- 

 sion, that they are specifically the same, appears to have been 

 accepted. To Carl (1907) belongs the credit of being the first 

 to recognize that the two sexes described by Cleve do not 

 belong to one another, that v.hereas the so-called female 

 {vide infra, p. 211) belongs to the genus Acrocalanus, the 

 male is undoubtedly a Paracalanus ; he, therefore, separates 

 this latter sex and proposes for it the name Paracalanus clevei. 

 During my investigations on the Copepoda of the coast of 

 Burma and on the present collections from the Gulf of Mannar, 



2 E 6(10)13 



