MAOU'RA. SCH MITT. 347 



and raised into blunt teeth only at the outer angles. Such 

 a specimen is this small Darnley Island, Torres Strait, 

 female from the Macleay Museum, Sydney (see Plate 

 Ixi., fig. 3). 



When it is borne in mind that Alcock in commenting 

 on the pair of divergent median teeth between the fourth 

 pair of legs, says : "In the young female the most con- 

 spicuous part of the thelycum is the last-mentioned 

 pair of teeth," cannot it be that what on the whole 

 seem to be minor differences between de Man's specimens 

 and the typical species, are due to immaturity of the 

 former? Though his largest females, of which the 

 figured specimen is one, are of no mean size, 60 mm. 

 long, de Man regrets that "the specimens collected by the 

 'Siboga' are unfortunately all young " 



The Macleay Museum specimen is scarcely 33 mm. 

 long, but closely approximates de Man's figure in the 

 shape of the thelycum and its component plates. The 

 spines between the second pair of legs are like those 

 of typk'al HWf/iensix, and resemble de Man's representa- 

 tion of them, but differ slightly in being a little more 

 slender and more widely spaced. The fifth legs of this 

 specimen are broken, and the third maxillipeds are gone 

 entirely. The right first leg exceeds the aritenual 

 peduncle by about the length of the fingers, the second 

 exceeding the first by nearly the entire length of the 

 hand; the third leg of the right side is longer than the 

 antenna! scale by about the length of the fingers, while 

 the fourth legs reach about as far forward as the first. 



All in all there hardly seems to be sufficient ground 

 to justify the separation of either de Man's or Alcock's 

 specimens from the true P. niogicnsis of Miss Rathbuu. 

 I also find that this same opinion was expressed by 

 Balss 36 in his "Ostasiatische Decapoden." De Man's male 

 specimens, by the way, show no characters at all tending 

 to separate them from the true mogiensix of Rathbuu. 



The juvenile thelycum figured by Balss 37 as that of 

 P. mogiensis is surely not that species. It is not unlike 

 Tattersall's 38 drawing of that organ of P. stebbingi. The 



36 Abh. der K. Bayer. Akad. Wissen., II., Math.-phys. Klasse, 

 Suppl., 9 Abh. 1914, p. 9. 



37 Denkschr., math.-naturwissen. Klasse, K. Akad. Wissen., xci., 

 1915, text-fig. 6. 



" 8 Jour. Linn. Soc. London, Zool., xxxiv., 1921, pi. xxvii., fig. 9. 



