25 



male when it is 5.5 cm. 



The spawning season is from the middle of June to August. 



This species is found along the Pacific coast of our country, from 

 the Bay of Awomori to Kagoshima. Captured in large quantities and 

 used as food and bait. 



P. granvJatus Haswell is very closely allied to this species and is 

 most probably synonimous. The male specimen of P. anchoralis Sp. 

 Bate<|l is identical with this species ; but the female (PL XXXV, I'") 

 is not. 



Known under the names of " saruyebi," " kosakuyebi," " atamabuto," 

 etc. 



PENAEUS LAMELLATUS. 



(PI. VI, 1) 



Penams lamcllatiis, de Haan, Fauna Japon. Crust. (1849) 



The body plump and is covered with setae. The rostrum short, 

 broad and straight, equal in length to the eyes. 9 — io dentate. No 

 dorsal carina on the carapace. The antero-inferior corner of the 

 carapace is toothed. The second and third joints of the first pereiopoda 

 and the second joint of the second pereiopoda unispinose. A pair 

 of spines between the second pair of pereiopoda. The pleon is 

 kieled from the second somite backward. The tail segment so long 

 as the sixth pleopoda, not distinctly furrowed. It is armed on each 

 side with one rigid and three movable spines. 



The central plate of the thelycum is provided with a spine, pro- 

 jecting anteriorly from the front margin. At each end of the lateral 

 plate a blunt protuberance is found. 



The petasma (PI. VII, 12) is not bilaterally symmetrical. The 

 left half is longer and its distal portion is broader than that of the 

 right half. 



