8o 



132 mm., from Stat. 302, the rostrum that reaches straight forward, to just beyond the 

 i^' antennular article, shows distinctly seven teeth; these teeth gradually decrease in size from 

 the 3''^ to the 7"^ which is very small and rudimentary. The rostrum of 9 females out of the 22 

 that were examined was armed with six teeth in addition to the epigastric tooth; in 6 females 

 I observed five teeth and finally there were 4 females with seven and 3 with six teeth, the 

 foremost of which was again rudimentary. The usual number proved therefore to be 

 six, but rostra with five teeth are not at all rare; in some specimens a seventh 

 resp. a sixth, though rudimentary, tooth occurs. The quite distinct post-rostral carina is not 

 grooved, but carries sometimes one or two shallow pits. 



It is remarkable, indeed, that in Spence Bate's figure of a probably adult female the 

 rostrum appears hardly longer than the i^' antennular article, for among the 22 females collected 

 by the "Siboga" a similar, short rostrum does only occur in two young females from Stat. 312. 



In the adult male the inner flagellum of the upper antennae is i^^ — lYs-times as long 

 as the peduncle, the outer is one-third shorter; the widened and grooved part of the outer 

 flagellum occupies about one-third of its length; in the adult female the flagella are shorter, 

 the inner being nearly as long as the peduncle. 



The scaphocerite of the outer antennae is, in the male, usually a little shorter, but in 

 the female somewhat longer than the antennular peduncle. Not only the legs of the 5'^ and 

 of the 4''^ pairs, also those oft he 3'''' are devoid ofan epipod. 



Parapenaejis Jissjirtis attains the length of 135 mm. 



General distribution: Philippine Islands (SPE^XE Bate) ; Talili Bay, New Britain 

 (Borradaile) ; Ganjam coast. Gulf of Martaban, Andamans (Alcock). 



33. Parapenactis Investigator is Ale. & And. 



Parapenaeus investigatoris A. Alcock and A. R. S. Anderson, Ann. Mag. Nat. Hist. (7) III, 



1899, p. 279; Illust. Zoology Investigator, Crust. PL XLI, Fig. i, la, \b. 

 Parapenaeus fissurns A. Alcock and A. R. S. Anderson, Journ. Asiat Soc. Bengal, LXIII, 



Part II, N" 3, 1894, p. 144. (nee Spence Bate). 

 Peneus (Parapcneus) investigatoris A. Alcock, Catal. Indian Deep-Sea Crustacea, Calcutta, 



1901, p. iS. 

 Parapenens investigatoris A. Alcock, Catal. Indian Decap. Crust. Part III. Macrura. Fasc. i. 



Calcutta, 1906, p. 32, PL VI, Fig. 17 and lya — c. 



Stat. 254. December 10. 5°40'S., 132° 26' E. Near Kei-islands. 310 m. Fine, grey mud. i 

 young male. 



The rostrum of this specimen, which is 48 mm. long, is somewhat directed upward and 

 carries 6 teeth besides the epigastric tooth. Measured along the carinate, upper margin the 

 5* abdominal somite appears to be 4 mm. long, the 6'^^ 9 mm. The telson is broken off just 

 beyond the lateral prongs. 



There are no epipods on the three last thoracic legs, a fact already mentioned by 

 Alcock and Anderson (I.e. 1894). 



General distribution: Off Pulicat; Gulf of Manar; Andaman Sea, N. E. and N. 

 of North Island (Alcock). 



80 



