482 PROCEEDrNTGS OF THE KATIONAL MUSEUM vol. 91 



Ridge of carpus of cheliped above inner spined margin armed with 

 four to five sharp spines, occasionally with a few very much smaller 

 ones in between, sometimes, as in one of the females, these spines 

 may not be fully developed, for they seem to be represented by 

 scabrous-tipped tubercles ; the spines arming the inner margin of the 

 carpus are very prominent, long, very strong, particularly the more 

 anterior, very sharp, and two in number not counting the almost 

 equally strong spine, which appears to be more properly a part of 

 the lobe at the upper anterointernal angle of the carpus ; in advance 

 of this particular spine the lobe carries a small, low, but sharp, conical, 

 and relatively inconspicuous spine. Dorsal margin of merus of 

 chelipeds armed at anterior end with a large, strong, sharply pointed 

 spine, followed by perhaps two or three very much smaller ones; a 

 spine similar to the large spine on the dorsal margin of the merus 

 but of even larger size arms the anterior margin of the joint; often 

 this spine has a little sharp spine or spinule on the inner or outer 

 side of its base. 



Inner margin of ventral surface of ischium with a very low, sub- 

 acute, corneous-tipped cone at anterior end, scarcely developed enough 

 to be called a spine, followed by three or four more or less equally 

 spaced little bumps or small nodules which in some cases apically 

 carry tiny, almost imperceptible, corneous scales. 



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

 parent first) abdominal somite markedly produced, forming an acute 

 corneous tipped spine which is strongly buttressed behind by a promi- 

 nent ridge or carina; anterior lateral margin below approximately 

 straight. 



Neotype. — Second largest male measuring slightly over 27 mm. in 

 length of carapace and rostrum, one of a lot of 10 5 2 2 from Orsono, 

 Chile, collected by the late Dr. C. H. Eigenmann, March 14, 1919 

 (U. S. N. M. No. 80021). 



Remarks. — On the basis of the general character and appearance 

 of the other species of Aegla described in this paper, Nicolet's original 

 description and figure of denticulata scarcely appeared credible; the 

 rather feeble hands led one to believe he had figured a female; the 

 dorsal longitudinal keel or ridge running the full length of the cara- 

 pace seemed an exaggeration; while the large prominent saw-teeth 

 along the distal moiety of the lateral margin of the posterior portion 

 of the carapace immediately behind the cervical groove gave the 

 impression that they were a figment of the imagination. But after 

 seeing the specimens of A. denticulata collected by Dr. Eigenmann, 

 here redescribed, I am willing to believe that almost anything in the 

 way of ornamentation and spining may be possible in the Aeglas. 



Nicolet's apparently crude figure has proved to be a surprisingly 



