526 COLLECTIONS FROM THE WESTERN TNDIAN OCEAN. 



posed of two moderately divergent spines. Orbits deep, tubular, 

 with a lateral aspect, and with two nearly closed fissures above. 

 Basal antcnnal joint very much dilated, with a small distal spine. 

 Chelipedes (in the male) rather small and slender, fingers nearly 

 straight. Ambulatory legs slender, not spinose or nodose. 



This genus must, I think, be associated with Pericera in the 

 family Periceridao, on account of the deep, well-defined, and tubular 

 orbits, notwithstanding the two narrow fissures in their superior 

 margin. It is further distinguished from Pericera by the deflexed 

 rostrum and the absence of a series of lateral spines. In Prioro- 

 rhynchus the rostrum is deflexed, but lamellate and merely notched 

 at its distal extremity. 



13. Entomonyx spinosus. (Plate XLYII. fig. B.) 



The carapace is moderately convex, subpyriform ; its surface un- 

 even and granulated, with two spines in a longitudinal series on the 

 gastric, two in a transverse series on the cardiac, and two on the 

 branchial regions near the postero-lateral margins. The spines of 

 the rostrum are rather short, moderately divergent, broadest at base, 

 and distally acute. The orbits are deep, tubular, project somewhat 

 laterally, and are bordered with short spiniform teeth ; in the upper 

 margin, near the postocular lobe or tooth, are two narrow fissures. 

 The postabdomen (in the male) is narrow, with the segments all 

 distinct, the first the shortest. The pterygostomian regions are 

 granulated. The basal antennal joint is granulated and very much 

 enlarged, and has a short spine at its distal extremity beneath the 

 base of the next joint, besides two small spines which are situated 

 on the inferior margin of the orbit. The anterior legs or chelipedes 

 are of moderate length and rather sleuder; merus-joint or arm 

 granulated, and with a series of spines on the upper and lower sur- 

 faces ; the wrist and palm also very closely granulated, the wrist 

 with some longer tubercles or short spines on its outer surface near 

 base ; the palm rather slender, nearly twice as long as the wrist ; 

 the fingers nearly straight, acute at their apices, and regularly den- 

 ticulated along their inner margins. The ambulatory legs are very 

 slender, and decrease regularly in length from the first to the last ; 

 their merus-joints are minutely spinulose above, and have a longer 

 spine at the distal extremity. The carapace and ambulatory legs are 

 clothed with short curled hairs, which are longest and most dense 

 at the base of the rostrum. Colour (in spirit) pinkish. Length of 

 carapace to base of rostrum nearly 5g lines (11 millim.), greatest 

 breadth 4| lines (9'5 millim.) ; length of a chelipede about \ inch 

 (13 millim?). 



An adult female and small male were collected at Providence 

 Beef, 24 fms. (No. 215), and three males and a female at Providence 

 Island, 19 fms. (No. 217). 



The rostrum is more strongly deflexed in the females than in the 

 males. 



