MACKURA. 71 



Parapenaeus dalei, Rathbun.* 



Parapenaeus dalei, M. Rathbun, ' Proc. U.S. Nat. Mus.,' vol. xxvi., p. 40, 1902. 

 Localities: Pearl banks, Gulf of Manaar (Station III.), 1 J; Galle (Station 

 XXXVI. ), 2 cf ; south of Galle (Station XXXIX.), 1 6 ; Trincomalee (Station XX.), 



1 <?. 



These specimens appear to agree with Miss Rathbun's diagnosis of the species. 

 The antennular flagella are thicker than in the other species of the velutinus group. 

 Length of largest specimen ( 6* ) : 



Total length from end of rostrum to tip of telson . . 40 millims. 



From tip of rostrum to end of carapace 11 ,, 



Side length of carapace 9 ,, 



Rostral formula . 







General distribution : Japan, Ceylon. 



Parapenaeus mogiensis, Rathbun Plate I., fig. 2. 



Parapenaeus mogiensis, M. Rathbun, ' Proc. U.S. Nat. Mus.,' vol. xxvi., p. 39, 1902. 

 Localities : Pearl banks, Gulf of Manaar (Station III.), 31 specimens ; west of 

 Negombo, hauls 1 to 4 (Station I.), 15 specimens; Palk Straits (Station XVIII. ), 



2 specimens; south of Galle (Station XXXIX.), 1 specimen; Coral reef, Gulf of 

 Manaar (Station LIV.), 7 specimens. 



The petasma agrees with the type, but the thelycum in all the specimens shows a 

 slight difference (see fig. 2). The appendages are more richly setose than is the 

 case with the other species of this group. The 3rd maxillipeds do not extend as far 

 as the tips of the antennal scales, but are situated behind them a distance equal to 

 the length of the distal joint of the 3rd maxilliped. The anteDnal scale is slightly 

 longer than the antennular peduncle. 



Dimensions of males (3 specimens) : 



Total length 56 millims., 48 millims., 61 millims. 



Length of rostrum and carapace . .18 ,, 15 ,, 19 ,, 

 Lateral length of carapace ... 15 12 14 ,, 



Dimensions of females (3 specimens) : 



Total length 75 millims., 67 millims., 61 millims. 



Length of rostrum and carapace . . 24 ,, 23 20 ,, 

 Lateral length of carapace ...19 ,, 18 ,, 16 ,, 



Rostral formula . 







General distribution : Japan, Ceylon. 



* This and the three following species belong to the Parapenaeus velutinus group. This collection of 

 Ceylon Crustaceans has given me an opportunity of examining a large number of specimens belonging to 



