250 SPOLIA ZEYLANICA. 



So far as its structure is concerned, the grasping antenna 

 ver}^ closely resembles that of T. gracilis ; segments 17, 18, 

 and 19-21 are all armed with rows of needle-like teeth. 



The -fifth fair of legs show distinct differences from the 

 corresponding appendages of T. gracilis ; these can best be 

 seen b>' "comparing the figures given. 



$. In the female T. forcipahis the first antenna consists 

 apparently of seventeen joints, having the following pro- 

 portional lengths : — 



The fifth pair of legs are markedly asymmetrical and 

 correspond exactly with the figure given by Ciesbrecht (1893, 

 PI. 81, fig. 15). 



The occurrence of the hitherto unknown male is of interest 

 and the differences that it presents to the male of T. gracilis 

 show that these two forms are undoubtedly different species. 



Refeeences. 



Carl, 1907. — "Copepodes d'Amboine." Revue Suisse de Zoolo- 

 gie. Vol. 15, p. 7. Geneve. 



Cleve, 1901. — " Plankton from the Indian Ocean and the Malay 

 Archipelago." Kongl. Svenska. Vetenskap. ' Akadamiens, 

 Handlingar. Bd. 35, No. 5. Stocldiolm. 



Cleve, 1903. — "Report on Plankton collected by Mr. Thorild 

 Wulff during a Voyage to and from Bombay." Arkiv for 

 Zoologi, Bd. 1, p. 327. Stockliolm. 



Cleve, 1904.— "The Plankton of the South African Seas." 

 Marine Investigations in South Africa, Vol. III., p. 177. 

 Cape Town. 



Dahl, 1894. — " Die Copeisodenfauna des unteren Amazonas. 

 Berichte de Naturforschenden Gesellschaft zu Freiburg 

 Vol. VIII., p. 10. Freiburg und Leipzig. 



