26 



The color of the animal is beautifully variegated. Most ap- 

 pendages are crimson red. 



The animal is about 6 cm. in length. 



This species is widely distributed from Hokkaido to Kushu, but 

 it is few in number. 



PENAEUS VELUTINUS. 



(PI. VI, 3) 



Penacns velntinns, Dana, U. S. Expl. Exp. xiii Crust (1852), 

 Sp. Bate, Challenger Rep. Crust. Macrura (1888). 



Penacns affinis, Proc. Zool. Soc. p. 304 (1878). 



The whole surface of the shell is covered with setae. The rostrum 

 is nearly straight or a little elevated near the anterior end. It is a 

 little shorter than the peduncle of the first antennae. 7 or 8 dentate, 

 toothed to the apex. The carapace not carinated. Antero-inferior 

 corner of the carapace pointed and forms a tooth. The second 

 gnathopoda and the first and second pereiopoda have a spine on the 

 second joint. The first pereiopoda has also a spine on the third joint. 

 A pair of long spines between the second pereiopoda. In females 

 the first joint of the fourth pereiopoda has an inward outgrowth. The 

 pleon is kieled from the second somite backward. The sixth somite 

 and the tail segment long. The tail segment and the sixth pleopoda 

 equal in length. 



The central plate of the thelycum (PI. VII, 1 1 A) has an ellipsoidal 

 protuberance. The lateral plates are coalesced. The seminal receptacle 

 consists of two small widely separated cavities (PL VII, 1 1 B). 



The petasma (PI. VII, 11) is not symmetrical, the left half is 

 longer and its posterior end is bent towards the right side while 

 its anterior end has many scale like processes. 



The color of the animal is pale red or greyish red. 



