368 "ENDEAVOUR'" SCIENTIFIC RESULTS. 



11-14 miles N.W. of Pine Peak, Queensland, 24-26 

 fathoms; four males (Reg. No. E.320T). 



13 miles N. by W. of Double Island Point, Queens- 

 land, 25-26 fathoms; one male and four females (Reg. No. 

 1-12057). 



Distribution. Otherwise P. plcbejus is known from 

 the type locality, Sydney (Hess and Pesta), and Port 

 Jackson, Australia, 2-10 fathoms (Bate); also Auckland, 

 New Zealand (Pesta). Ogilby gives the common name 

 of "Sand Prawn" to this shrimp and says : "This Prawn 

 is taken in large numbers by small-meshed nets on sandy 

 beaches near the mouths of our [Australian] rivers, the 

 principal supply coming from George's and Cook's Rivers. 



"They are delicious food, and grow to five inches in 

 length." 



Remarks. This species can readily be distinguished 

 from other related species, bearing three pairs of lateral 

 spinules on the telson, and but one spine on the lower 

 border of the rostrum, by the presence "at either side 

 of the rostrum, about midway betw r een the lateral rostral 

 carinse and the tips of the teeth, another carina that 

 commences near the base of the first rostral tooth and 

 that, gradually narrowing, is continued to the foremost 

 tooth where it passes into the upper margin of the 

 rostrum. This second carina is wanting in P. lati- 

 sulcatus" (de Man, op. tit., p. 110). These secondary, 

 lateral, rostral carinae subtend or rather define distinct 

 secondary, lateral, rostral sulci easily seen in the dorsal 

 view. 



Concerning the type specimen of P. canaliculatus, 



var. australicnsis Bate, which de Man refers to as P. 



^plebejus, Dr. Caiman wrote de Man (op. cit., p. Ill) : 



" The accessory carinae are present just as you 



describe them in P. plebejus, but the groove which defines 

 each on the inner side of the rostral teeth becomes dis- 

 tinct in front of the fourth tooth, so that, on the rostrum 

 itself, the accessory ridges are only a little better defined 

 than the slight ridges occupying the same position in 

 /'. canaliculatus. Posteriorly, however, the accessory 

 ridges are quite distinct and end just behind the first 

 tooth " 



As first called to our attention by de Man (loc. 

 cit.) and later figured by Pesta (loc. cit.), "there are 



