70 CEYLON PEAEL OYSTER REPORT. 



Parapenseus, Smith, 1885. 



I have followed Smith' 5 ' in separating certain species from the genus Penreus. The 

 characters of the genus Parapenceus, which distinguish it from the genus Penceus, 

 are: (l) Endopodite of 1st maxilla is short and unsegmented ; (2) 3rd maxilliped 

 without an epipodite, and (3) the absence of branchiae from the last thoracic segment. 



Parapenseus anchoralis (Sp. Bate). 



Penaaus anchoralis, Sr. Bate, ' " Challenger " Macrura,' p. 258, 1888. 



Localities: Pearl banks, Gulf of Manaar (Station III.), 1 specimen (?); Trin- 

 comalee (Station XX.), 1 specimen (?) ; off Kaltura (Station XLIIL), 1 *$ ; Galle 

 (Station XXXVIL), 1 ? ; Aripu Reef (Station XLIV.), 1 S and 2 ?. 



Male : Total length 40 millims., carapace and rostrum 15 millims. 



Female : Total length 64 millims., carapace and rostrum 23 millims. 



Rostral formula is ^ <- 







The rostrum in the females appears to be slightly longer than in the males. The 

 female rostrum reaches to the end of the second antennular segment. In the male it 

 only reaches slightly past the first segment. 



The dorsal groove of the telson appears to be deeper in the female than in 

 the male. 



General distribution : Pacific, Japan, Ceylon. 



Parapenaeus incisipes (Sp. Bate). 



Penaeus incisipes, Sp. Bate, ' " Challenger " Macrura,' p. 257, 1888. 

 Parapenseus incisipes, Rathbux, ' Proe. U.S. Nat. Mus.,' vol. xxvi., p. 38, 1902. 



Locality: Gulf of Manaar, 1 specimen, <$. 



The rostrum is straight and not so deep as in the preceding species. It extends 



9 + 1 

 to the middle of the 3rd joint of the antennular peduncle. Rostral formula is 



The flagella of the antennule are short and equal in length to the 2nd and 3rd 

 joints of the peduncle. 



Two obliquely longitudinal grooves cross each side of the carapace. The anterior 

 groove becomes comparatively deep ventrally. The carapace tends to become much 

 shallower dorso-ventrally at the anterior end. 



The meropodite of the 5th pereiopod is notched at its proximal end. There is a 

 tubercle present on the endopodite of the 2nd abdominal appendage. The 6th 

 abdominal segment is 1^ times as long as the 5th. The uropods are slightly notched 

 at their outer proximal margins. 



General distribution : Philippines, Japan, Ceylon. 



* Smith, ' Proc. U.S. Nat. Mus.,' VIII., p. 170, 1885. 



