28 DH. W. T. CALMAN ON A COLLECTION OF 



PSEUDOPHILYRA TRIDBNTATA, Miers. 



Psmdo/ihihjra tridentata, Miers, Proc. Zool. Soc. 1879, p. 11, pi. ii. fig. 4; Alcock, Journ. Asiatic Soc, 

 Bengal, Ixv. (2) p. 250 (1890). 



Our specimen, a male, agrees closely with Miers's type specimen, which, though 

 described as a male, is apparently a sterile female. The inferior hepatic prominences 

 are in our specimen placed a little further forward, so that they are visible from above 

 in front of the superior prominences. The figure which accompanies Miers's description 

 is a very indifferent representation of the type specimen, the whole frontal region, for 

 instance, appearing relatively much too broad. The following are the approximate 

 dimensions of the type and of our specimeu : — 



Type specimen. Torres Straits specimeu. 



Length of carapace 10 mm. 13-5 mm. 



Breadth „ 8-5 „ 11-5 „ 



Height „ 5-5 „ 7-0 „ 



Width of front between external orbital teeth ... 2'35 „ 2'75 „ 



Length of cheliped 210 „ 



„ palm 7-0 „ 



Width of palm 3-5 „ 



Length of fingers 30 „ 



Alcock's description applies very well to the specimen before me, except that he states 

 the hand to be about " half as long again as broad." As will be seen from the figures 

 given above, the palm alone, exclusive of the fingers, is twice as long as broad. Each 

 finger carries a low obtuse tooth on the inner edge about the middle of its length. 



Locality. "Torres Straits." 



Distribution. Persian Gulf {Alcock) ; S. Japan {Miers). 



Akcania gkacilipes. Bell (?). 



Arcania gracilipes, Bell, Trans. Linn. Soc. xxi. p. 310, pi. xxxiv. fig. 9 (1855) ; Alcock, Journ. 

 Asiatic Soc. Bengal, Ixv. (2) p. 270 (1896). 



A male specimen, the carapace of which measures about 7 mm. in length and in 

 breadth, with chelipeds about 15 mm. long, is referred with some doubt to this species. 

 Compared with Bell's type specimen, it diff'ers in the greater excavation of the hepatic 

 regions above and the consequent greater prominence of the neck-region. The front 

 (between the orbits) is also more prominent at the outer corners, so that the orbits have 

 a more lateral position. The carapace, as a whole, appears much less inflated, and the 

 inter-regional grooves, especially the branchio-cardiac grooves, are deeper. The marginal 

 tvibercles are less prominent, and the whole surface is covered with closely-set depressed 

 and smooth granules. In the type the granules are more widely spaced and more or less 

 distinctly capitate or fungiform. Some phrases of Alcock's description, the " sunken " 

 hepatic region and the cju*apace " closely covered with flat discoidal granules," are more 

 suggestive of our specimen than of the type. 



Locality. " Minders Entrance, Mer, 20-30 fath." 



