iS 



complete. This species coincides with Spence Bate's figures and des- 

 cription of the type specimens of M-Ed\vard, preserved in the Museum 

 of the Jardin des Plantes. 



There are man)' closely allied species. 



PENAEUS INCISIPES. 



(PI. IV, 2) 



Penaeus incisipcs, Sp! Bate, Challenger Rep. Crust. Macrura (1888). 



The surface of the shell roug-h with irregular, shallow and setae- 

 grown grooves. The rostrum nearly straight and generally 8 dentate 

 above. In female specimens, the tip of the rostrum is a little bent 

 upwards. Continuous to the root of the rostrum, there is a little eleva- 

 tion in the median line of the carapace. Besides this, there is a faint 

 elevation between the hepatic tooth and the posterior margin of the 

 carapace. The first pair of pereiopoda bispinose and the second and 

 third pairs unispinose. In males, there is a tooth on the fourth joint 

 of the fifth pereiopoda. In the pleon there is a kiel in the dorsal 

 median line from the first somite to the last ; but it is faint in the first- 

 third somites. An incision in the pleuron of the first somite. The 

 incision is marked in males. The peduncle of the pleopoda thickly 

 beset with setae. The sixth pleopoda has a slight protuberance on 

 its peduncle in males. The tail segment is grooved. 



The central plate of the thelycum (PI. VII, 6 A) is laterally compress- 

 ed. It is a little expanded at the anterior end. Each lateral plate 

 forms a crescent-shaped ridge at the external margin. The first joint 

 of the fourth pereiopoda is expanded and meets the lateral margin of 

 the central plate of the thelycum. The wall of the seminal receptacle 

 is thick and calcified. The receptacle is divided into two cavities by 

 a median septum. 



