500 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



quite similar to its merns; its contour and proportions are quite dif- 

 ferent from the carpus of /. ja/ponensis. The propodus of /. geei is 

 reLatively stout, evenly curved, not quite as long as the dactyl, which 

 forms a strongly curved hook extending upon and overlapping mid- 

 way on the inner side of the carpus. It will be noted that this hook 

 is more strongly pronounced and differently bent from that of any of 

 the previously described species of the genus. 



/. japonensis; Coxopodite rudimentary; basipodite slightly wider 

 basally than distally, the outer side is relatively convex, not con- 

 spicuously keeled; the distal end broadly, roundly shouldered, its 

 point of union with the ischium preserving the unbroken marginal 

 line; the inner side bears a distinct groove, which widens near the 

 basal end; the margins on either side are distinct, slightly pro- 

 duced. The ischium is as long as the basipodite, narrow, sub- 

 cylindric basally, widening distally, roundly thickened along the 

 inner side and with the outer distal portion reduced, flattened. 

 The merus is slightly wider than long, the outer margin evenly 

 rounded, the inner distal area strongly produced projecting along 

 nearly seven-eighths of the length of the inner side of the carpus; 

 the distal margin of the merus is strongly deeply excavate, encup- 

 ping the carpus and reenforcing it on the inner side. The carpus is 

 shorter than the merus, subcylindrical, with the inferior margin so 

 little produced that the " rounded expansion " is visible only at the 

 outer basal area tapering to a hair's breadth at the distal end. The 

 propodus is slightly longer than the carpus and only a trifle nar- 

 rower and is evenly recurved. The dactyl is relatively stout basally, 

 but curves somewhat and tapers to a very fine point, which is di- 

 rected toward the distal end of the carpus but barely reaches the 

 extreme tip of the margin of the carpus. 



/. jellinghausii: Coxopodite rudimentary, basipodite but little con- 

 stricted basally and upcurved, relatively convex, distal end pro- 

 nouncedly shouldered, forming a blunt right-angled projection on 

 the outer distal margin ; the line of union with the ischium is rela- 

 tively straight, the side is convex, in marked contrast to that of geei. 

 The ischium has the form of an inverted truncated triangulate pyra- 

 mid, with the sides not concavely depressed and the margins scarcely 

 at all produced. The merus is more than half as long as the ischium, 

 slightly longer than wide; the outer margin roundly produced 

 but with a relatively less flaring lobe than either of its allies. The 

 produced inner distal area extends less along the inner side of the 

 carpus than in geei. The articulation of the carpus with the merus 

 is also distinctive; the carpus is compressed, subpyriform; the pro- 

 podus is a trifle longer than the carpus, is less pronouncedly curved 

 than is geei or japort^-nsis. The dactyl is differently inserted basally, 



