23 



PENAEUS CORNUTUS. Nov. Spec. 



The shell smooth and thick. The upper part of the carapace 

 beset with setae. The rostrum nearly straight in males, but in females 

 it is elevated at the apex and is longer than in males. It is nearly 

 equal in length to the scaphocerite. 8 dentate. Continuous to the 

 rostrum, there is a faint kiel on the carapace. From the orbit a longi- 

 tudinal fissure runs about 2 3 the length of the carapace. There is 

 a kiel from the fourth pleonic somite backward. The tail segment is 

 furrowed. The second joint of the first and second pairs of pereiopoda 

 unispinose. The fifth pereiopoda longest. 



The central plate of the thelycum (PI. VII, 9 A) is large and 

 oblong. The lateral plates are coalesced together. The seminal 

 receptacle consists of two quite separate cavities. They are small and 

 their walls are calcareous. 



The anterior end of the petasma is divided into two horn-like 

 processes (PI. VII, 9). 



The male attains the length of about 1 1 cm., the female about 

 14 cm. 



Found in the Bay of Ariake, Kiishu. 



PENAEUS CURV1R0STRIS. 



(PI. VI, 4) 



