THE SPECIES OF AEGLA — SCHMITT 497 



than the scabrosities of the surface of the finger otherwise in the 

 position normally occupied by the lobe in other species. (Having 

 so little material, it is impossible to tell whether the lobe is in evi- 

 dence in small individuals of the species. There is no trace of it 

 on the movable finger of the loose cheliped.) Palmar crest more or 

 lesa subrectangular, thicker appearing than in A. neuquensis and 

 certainly with thicker, blunter, obscurely crenulate, coarsely scabrous 

 margin; dorsal surface of crest decidedly more concave (more or less 

 longitudinally troughed) than in A. neuquensis^ but without giving 

 the margin of the crest any noticeable bent-up appearance. Carpal 

 ridge fairly broad and blunt, more or less obscurely scabrous, and 

 only obscurely double-rowed as in A. neuquensis^ spines of inner 

 margin of carpus thickened and scabrous, between anterior spine 

 (very much the largest and stoutest of this inner marginal series) 

 and the carpal ridge is a tuberculiform, scabrous elevation corre- 

 sponding to the similarly placed spine in typical A. neuquensis; lobe 

 at anterior inner angle of carpus quite rounded off in general outline, 

 margined with small, denticuliform, corneous scales. Upper longi- 

 tudinal margin of merus of cheliped armed with a series of small 

 scabrous tubercles ; this row or series at its anterior end makes prac- 

 tically a right-angled bend one or two tubercles long, toward the 

 inside, more or less paralleling anterior margin proper of joint"; 

 this is very evident in the meri of the type but not in the additional 

 loose claw (No. 4186) of this species. No indication, or scarcely any, 

 of this state of affairs exists in A. neuquensis; there may be a bare 

 suggestion of it in some specimens in which a tiny, well nigh micro- 

 scopic corneous scale or prickle may appear on the inner side of the 

 anterior spine or tubercle of the upper longitudinal margin of the 

 merus of the cheliped. The anterior margin of the merus of A. 

 affinis, though scabrous or fine denticulate, shows no median lobular 

 development as is present in A. neuquensis. 



Inner margin of ventral surface of ischium armed much as in A. 

 neuquensis, only cones are smaller, mostly blunter, and on the whole 

 more nearly subequal throughout, four on right ischium, six on left, 

 because of a twinning of the posterior spine, and also the one just 

 anterior to it. 



Anterior dorsal angle of epimeron of second (in lateral view, ap- 

 parent first) abdominal somite rounded off; anterior margin below 

 angle straight, or very slightly concave. 



Anterolateral angles of sternite between bases of chelipeds pro- 

 duced, tuberculiform; on median line near anterior margin a low 

 swelling, but with no trace of a corneous spine or denticle arming it. 



"A similar condition is found in .4. unnjiiavc'io. n. 467. 



