480 PROCEEDUVGS OF THE N^ATIONAL MUSEUM vol. 91 



the middle of the length of the articular membrane and a stouter 

 low-conical one on imier side of ischium near "apex" of ventral face 

 of this joint. 



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

 apparent first) abdominal somite may be blunt or rounded off, or 

 armed with a tiny corneous spinule; the anterior margin below the 

 anterior angle or spinule is very slightly concave. In the largest 

 of three specimens, the male type, there is a definite small spine on 

 the left side and none on the right ; the other two specimens are quite 

 small, the larger of these has a corneous spine on the right side and an 

 almost imperceptible corneous scale or tiny granule on the left; the 

 smaller has neither scale nor spine on either side. 



Holotype. — The largest of three male specimens measuring about 

 29 mm, in length of carapace and rostrum together, collected by An- 

 tonio Pozzi and Angel Gatta, Rio Chico, Jujuy, 1925 (M.A.C.N. No. 

 16237). 



Remarks. — See under A. franca., above, and A. hutnahuaca, below. 



Distribution. — Known only from the type locality. 



AEGLA DENTICULATA Nicolet 



Figure 53 ; Plate 26, C 



Aeglea denticulata Nicolet, in Gay, Historia fisica y politica de Chile, Zool., 

 vol. 3, p. 200, 1849; Atlas, Crustaceos, pi. 2, fig. 1, 1854.— Oirard, Report 

 of the U. S. Naval Astronomical Exi)e(iition to the Southern Hemisphere, 

 vol. 2, p. 255, 1855 (listed only). 



Aegla denticulata Rathbun, Proc. U. S. Nat. Mus., vol. 38, p. 602, 1910 (listed 

 only). 



Description. — A distinctive, well-marked species of good size when 

 fully grown, attaining a length of carapace and rostrum together of 

 at least 31 mm. (based on the estimated length of a large specimen 

 with broken rostrum) ; smallest specimen seen, also a male, 14.5 mm. 



Carapace prominently and boldly, but bluntly, keeled for practi- 

 cally the full length of its median line, interrupted only by the 

 cervical groove; carapace more ridge-roofed than convex; lateral 

 margin of posterior portion of carapace behind cervical groove con- 

 spicuously serrate, first of these saw-teeth just behind cervical groove 

 larger and broader than anterolateral tooth of carapace, second nearly 

 equal to first; following teeth of lateral margin decreasing in size 

 posteriorly to transverse suture line separating the anterior portion 

 of the branchial region from the posterior; behind this suture line 

 the margin is scarcely more than small denticulate, almost crenulate 

 in appearance; the larger teeth or serrations of the lateral margin 

 are often secondarily toothed or spined on their posterior borders. 

 Front narrow. Rostrum moderately broad-triangular, scarcely if at 

 all exceeding eyestalks by as much as the length of the cornea ; an- 



