BRACHYURA AND MACRURA 277 



of the inner surface of the pahn in the male, and in full-grown speci- 

 mens the sulcus on the upper surface of the palm. 



UCA HELLERI sp. nov. 

 (PI. XII, figs. 3 and 4.) 



A small species. Carapace moderately convex, depressions shallow. 

 Surface microscopically granulate, and with more distant punctie. 

 Front broad, but at base less than one third the width between the 

 anterior angles; broadly rounded. Anterior margin sloping very 

 abruptly backward from the front to the antero-lateral angles, scarcely 

 sinuous. Antero-lateral angles prominent, rectangular; width of 

 carapace greatest at these angles. Sides sloping strongly toward each 

 other posteriorly ; moderately sinuous, the posterior width about two 

 thirds of the anterior. The eyebrow is for the most part visible from 

 above ; its width is about five times its length ; the greatest width is 

 about one third the distance from the inner end. Lower margin of 

 orbit also visible in a dorsal view. 



The merus and carpus of the large cheliped of the male are elongate ; 

 the outer surface is crossed by short, transverse lines of very fine 

 granules ; on the merus these cross the upper margin and extend a 

 little way down the inner surface ; the lower margin of the merus is 

 armed with sharp granules which increase in size distally, becoming 

 tubercles towards the end ; two or three other rows of fine granules 

 are close to the lower margin on the outer surface. The outer surface 

 of the manus is covered with granules larger above and very fine on 

 the outer surface, not distributed evenly, but somewhat reticulated, 

 leaving small smooth patches. There is an irregular pit behind the 

 union of the fingers. The upper margin has a distinct marginal tuber- 

 culated line on its proximal half only ; on the distal half the outer sur- 

 face rounds over to the inner. The inner surface has an oblique ridge 

 extending at an angle of about 45 degrees upward and backward from 

 the lower margin ; at about the middle of the palm the ridge turns 

 at a right angle or an obtuse angle and is continued upward to the 

 margin ; the ridge is formed by a line of large, irregular tubercles ar- 

 ranged for the most part in a single row. At the base of the dactylus 

 there is a double row of tubercles which superiorly converges more or 

 less towards the ridge at the middle of the palm. The surface between 

 these rows of tubercles is almost smooth. The fingers are long and 

 narrow ; between them when closed, there is a gape wider than either 

 fino-er. A depression on the proximal half of the outer surface of the 

 pollex. Of the tubercles on the prehensile edges, there is one larger 



