354 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 46. 



This species differs from E. japonicus de Haan/ E. sinensis (Milne 

 Edwards),^ and E. rectus (Stinipson) ,^ in its more even surface, shorter 

 front with straighter margin, shallower orbits, and narrower max- 

 illipeds. 



PTYCHOGNATHUS JOHANNA, new species. 

 Plate 30. 



Type-locality.— JohsiTinfi Island, Comoro Islands, Western Indian 

 Ocean; collected by Hildebrandt; received in exchange from the 

 Berlin Museum; 1 male. 



Type.— C&t. No. 22799, U.S.N.M. (formerly No. 4598, BerMn Mu- 

 seum) . 



Dimensions. — Male, length 16.3 mm., width 19 mm. 



Carapace flattened except anteriorly, sHghtly narrowed anteriorly, 

 regions not delineated; surface punctate, mostly nongi-anulate ; 

 H-depression and postfrontal lobes well marked; front inclined, 

 bimarginate, sinuous, lobes of lower margin projecting beyond those 

 of upper margin; upper margin of orbit sinuous, directed backward 

 and outward; tooth at angle of orbit obtuse; other lateral teeth blunt; 

 teeth not well separated, second overlapping first, and third over- 

 lapping second, forming closed fissures and shallow sinuses; the ver- 

 tical, postero-lateral area separated from the dorsal surface by a ridge 

 only in the posterior half. 



Antennules folded obHquely transversely. Epistome narrow, pos- 

 terior edge crenate. Exognath very convex, its greatest width equal- 

 ing that of the ischiognath; the latter increasing in width distally; 

 lobe of merognath very large and extended laterally. 



Chehpeds of male stout. In the single specimen the right one is 

 much the smaller, perhaps due to regeneration. Upper and inner 

 margins of arm with a scant fringe of hah- ; inner angle of wrist bluntly 

 rectangular; a patch of hair below the outer angle; left palm about 

 two and one-half times as high as its superior length; a very large 

 patch of long hair on the outer face near the fingers and continued 

 half way along the fingers; largest prehensile teeth near middle of 

 immovable finger; on the outside of this finger near the tip there is a 

 very inconspicuous Y-shaped fringe of short hair; within the spoon 

 of both fingers are several small fascicles of hau-. 



Legs moderately hairy. 



Abdomen of male triangular-oblong; on each side of the first seg- 

 ment there is a deep cavity which occupies about one-fourth of the 

 segment. 



1 Orapsus {Erioeheir) japonkus de Haan, Fauna Japon., Crust., 1835, p. 59, pi. 17. 



2 EriochiTus sinensis Milne Edwards, Arch. Mus. Hist. Nat., Paris, vol. 7, 1854, p. 146, pi. 9, figs. 1-lc. 



3 Eriochirus rectus Stimpson, Proc, Acad. Nat, Sci. Phila., vol. 10, 1858, p. 103 [49]. 



