SURFACE COPEPODA OF THE GULF OF MANNAR. 211 



ante, pp. 205, 206), the male of this so-called Acrocalamts ia in 

 reality the male Paracalanus aculeatus. The supposed female 

 is undoubtedly an Acrocalanus, but is an immature male ; 

 the presence of a fifth leg on the left side and the segmentation 

 of the abdomen are sufficient to indicate the sex, and the form 

 apparently corresponds to the male Acrocalanus gibber. In 

 the Ceylon collections numerous examples of this immature 

 male were present, and in almost every case were associated 

 with both immature and mature females of the above species. 



Acrocalanus gardineei, Wolfenden. 



Acrocalanus gardineri, Wolfenden, 1905, p. 1004. PI. 



XCVII., figs. 5, 10, 14-21. 

 Sewell, 1912, p. 359. 



The above name was given by Wolfenden to certain adult 

 males that he found in Professor Stanley Gardiner's collections 

 from the Maldive and Laccadive Archipelagoes. In the 

 present collections are several examples that agree very fairly 

 well with Wolfenden's description and figures. These males 

 are usuallj^ associated with females that appear to belong to 

 the species A. gracilis, and I am inclined to regard A. gardineri 

 and A. gracilis as synonymous, but, at the present time, the 

 data at my disposal is not sufficient to warrant a definite 

 pronouncement on this point. 



Acrocalanus similis, sp. nov. 



(PI. XVII., figs. 3-5.) 



Several examples, both male and female, of a species of 

 Acrocalanus were obtained at several stations in the Gulf of 

 Mannar. At first sight I took these specimens to be examples 

 of A. inermis, a species that was described by me {he. cit., 1912, 

 p. 334, PI. XVI., figs. 1-0) from the coast of Burma, but a 

 closer examination revealed the fact that, although the 

 resemblance between these two forms is verj^ close, yet they 

 differ in several characters, and I consider that the present 

 examples are in all probability a new species, for which I 

 propose the above name. 



