RATHBUN— MARINE BRACHYURA 243 



Neck long ; orbital arches unarmed ; rostrum reaching to middle of second movable joint 

 of antennae, composed of two narrow, acute, flattened horns close together ; median fissure 

 extending back nearly to the distal end of the basal joint of the antennae, and continued by 

 a groove on the carapace to the posterior end of the orbits. In the single specimen the right 

 horn is a little shorter than the left. Eye-stalks strongly enlarged at the corneal end where 

 they are produced obliquely forward and upward in a tubercle. Pterygostomian region 

 armed with a tubercle which shows in dorsal view behind the hepatic region. The buccal 



Fig. 1. Macropodia formosa, sp. nov. 



cavity widens distally, and its anterior angles are so expanded that they too are visible in 

 dorsal view, but in front of the hepatic region. The sternum bears a tubercle on either 

 side just in front of the abdomen of the $. 



Chelipeds of $ moderately stout, and with straight hairs on inner margins, and some 

 curled hairs outside. Arm with a distal spine above, and a row of spinules on the inner 

 and outer mai-gins. Wrist and propodus with similar spinules arming both margins of the 

 inner surface. Fingers about as long a9 palm, occludent margins denticulate, a slightly 

 enlarged truncate tooth near base of dactylus, a very slight gape for basal third. 



Legs extremely long, with a line of curled hairs on the anterior surface except on the 

 dactyls, and a few straight hairs especially on the first two dactyls ; merus with a short 

 terminal spine on the anterior edge; first two dactyls nearly straight, last two a little 

 more curved and finely spinulous on their proximal third. The third right leg is abnor- 

 mally short. 

 Dimensions of $ in mm. : 



C. 1. 8-4. 



C. b. 5-2. 



R. 1. (from front edge of orbit) 17. 



Antenna, free portion, 45. 



H. 1. 35. 



