242 SPOLTA ZEYLANICA. 



AcAETiA BisPiNOSA, Carl. 



Acartia bispinosa, Carl, 1907, p, 13. PI. I., figs. 1, 2. 

 Pesta, 1912, p. 54, fig. 17. 



This species was first described by Carl from Amboina, and 

 since then it has been recorded by Pesta from the Persian 

 Gulf. Numerous examples were obtained in the Ceylon 

 collections, and the specimens agree closely with previous 

 descriptions. According to Carl and Pesta, there are only 

 two spines on the postero -lateral thoracic margin, but this 

 appears to be a variable character, as in some of the present 

 examples an extra spine occurred, making three in all. Only 

 the males of this species have up to the present time been 

 discovered. 



Acartia pietschmani, Pesta. 



Acartia pietschmani, Pesta, 1912, p. 55, fig. 18. 

 Pesta, 1913, p. 33. 



This species was described from the Persian Gulf, where 

 examples of the adult female and some immature males were 

 obtained, and has since been obtained in the Arabian Sea. 

 Several examples were found in the Ceylon collections that 

 correspond with this form ; they at first sight are likely to be 

 mistaken for A. crythrsea, but they are of smaller size, and the 

 structure of the fifth pair of legs in the female of the two 

 species is different. 



Acartia amboinensis, Carl. 



(PI. XIX., figs. 1-7). 



Acartia amboinensis, Carl, 1907, p. 12. PI. I., figs. 3-5. 



Numerous examples were found in the present collections. 

 This species was described by Carl from male examples only ; 

 these very closely resemble the male of A. crythrsea, but there 

 are certain constant differences in the structure of the fifth 



