156 SMITHSONIAN MISCELLANEOUS COLLECTIONS 



minutely granulated. In the female the tubercles of the carapax 

 are less prominent and more obtuse than in the male. The outer 

 maxillipeds, as well as the sternum, are microscopically granulated. 

 The chelipeds are shorter and more slender than in P. crassipes ; the 

 hand smooth ; the fingers short, sulcated, and minutely denticulated 

 within, but with no large tooth. The ambulatory feet are more 

 slender. In life the carapax was mottled with white and bluish- 

 gray ; the feet and chelipeds usually annulated or banded. The 

 dimensions of a female are : Length of carapax, 0.4 ; breadth, 0.38 

 inch. 



On shelly ground in two fathoms, near the mouth of Port Jackson, 

 Australia. 



Genus ARCANIA Leach 



256. ARCANIA GLOBATA Stimpson 



Plate XVIII, Fig. 9 



Arcania glohata Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 160 [58], 

 1858. 



Of this species two females were taken, to wdiich the following 

 description will apply: Breadth to length as i : 1.05. The carapax, 

 leaving out the protruded front, is regularly and evenly globular — 

 the regions not being circumscribed — and thickly covered above with 

 small, sharp, scarcely granulated spines, ten of which, around the 

 margins, are a little longer than the others. A median spine on the 

 post-cardiac region is also somewhat larger than the others. Be- 

 tween the two large spines on the posterior margin there are two 

 small ones. Frontal region nearly smooth, posteriorly minutely 

 spinulose ; frontal margin regularly concave, arcuated, terminating 

 in a small tooth at each extremity. Chelipeds closely granulated, 

 granules mostly subspiniform, those of the hand much smaller than 

 those of the meros-joint. Fingers slender, as long as the palm. 

 Ambulatory feet smooth. 



Color in life pale brick red above, with a longitudinal wedge of 

 white margined with brown, the apex of which is at the middle of 

 the carapax, the base covering the front. Beneath white, tinted with 

 reddish. Dimensions of the carapax : Length, 0.46 ; breadth, spines 

 included, 0.44 inch. 



The carapax in one of the specimens is somewhat more depressed. 



It differs from A. erinaceus in wanting spines on the ambulatory 

 feet ; from A. tuberciilata and A. levimana in having sharp instead of 

 tuberculiform spines. 



