360 "ENDEAVOUR" SCIENTIFIC RESULTS. 



Penwus latlsiuJcatus, de Man, "Siboga" Exped., xxxixa, 

 1911 (plates, 1913), Decapoda, pt. i., Penaeidae, p. 

 108, pi. ix., figs. 35-&, and synonymy. Id. Balss, 

 Abh. der K. Bayer. Akad. Wiss., II., Math.-phys. 

 Klasse, Suppl., 10 Abh., 1914, p. 13. Pesta, Archiv 

 f. Naturg., 1915, Abt. A., Heft 1, p. Ill, fig. 3. 



Occurrence. 12 miles X.N.E. of Bowen, Queensland, 

 19-25 fathoms; one male (Reg. No. E.3157). 



Off Marsden Point, Kangaroo Island, South Aus- 

 tralia, 17 fathoms: two males and three females (Reg. 

 Xos. E.797, E.798, E.4501, E.4502 and P.2308). 



South Australia ; four males and twenty-three females 

 (Reg. Nos. E.3196, E.3197, P.3575, P.3576, P.3577, P.3578, 

 P.3579, P.3580,, P.3581, P.3582, P.3608, P.3609, P.3610, 

 P.3611, P.3612, P.3613). 



Distribution. Previously known from Japan, Naga- 

 saki to Yokohama (Kishinouye, Rathbun, Balss) ; 

 Pescadores Islands, Formosa, Sandakan Bay, Borneo, 

 Dutch East Indies, Batjan, Cerain, Nusa Sant, Tiur and 

 Saleyer Islands (de Man), Straits Settlements, Penang 

 (Lanchester), Red Sea (de Man). 



Remarks. The teeth on the upper margin of the 

 rostrum vary from 8-11 in number, but usually the 

 number is 9 or 10. In this species the post-rostral 

 carina, inclusive of the median sulcus which it bears, 

 generally appears to be narrower than the width of the 

 lateral grooves, while in the related P. japonicus of Bate 

 it seems wider than the lateral grooves. However, the 

 form of the thelycum and petasina Avill always separate 

 the two. 



The thelycum in P. latisulcatus is composed of two 

 plates separated from one another on the median line 

 by a narrow fissure; in P. japonicus the two plates com- 

 posing the thelycum are indistinguisliably fused on the 

 median line to form a single large plate. 



The pestasma has two very short submedian teeth 

 or "horns," hardly more than mere protuberances. These 

 are but slightly bent over and do not tend to overhang 

 the distal margin of the side plates of the organ. 



In P. japonicus (cf. Pesta, op. cit., figs. 1-2) the 

 similarly placed protuberances or "horns" are bent over. 



