436 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 91 



incorrectly figured and described. The most surprising thing about 

 it, however, is that a so strikingly different Aegla eluded rediscovery 

 for so long a time. Specimens taken by the late Dr. C. H. Eigen- 

 mann at Osorno, Chile, in 1919 have at last enabled me to establish 

 the validity of Nicolet's species 93 years after its original description. 



In April 1839, the United States Exploring Expedition secured a 

 number of Aeglas "in shallow fresh water streams, [in] Chili, from 

 beyond the Cuesto del Prado, on the road from Valparaiso to Santi- 

 ago, sixty miles from the sea ; abundant, swimming generally over the 

 bottom." Dana (1852, p. 476; Atlas, 1855, pi. 30, fig. 6a-/) de- 

 termined, redescribed, and figured these specimens as A. laevis, yet 

 they cannot safely be assigned to any of the known species of the 

 genus, as the fingers of the chelae as figured are without a lobular 

 tooth on their prehensile margins; the general appearance of the 

 palmar crest and the lack of a definite or spiny lobe on the outer 

 margin of the movable finger near the base suggest A. laevis 

 talcahuano. 



[After the foregoing paragraph had been type-set I had the oppor- 

 tunity of examining one of Dana's original specimens as noted above 

 (p. 433). It is identical with what I have redescribed as true A. 

 laevis. Except for its somewhat smaller size, 9 mm. less in length 

 of carapace and rostrum taken together, it might have been the speci- 

 men figured by Dana. His drawing seems to have been a little hastily 

 done, for the rostrum is too slender and sharp, and the hands are not 

 very well drawn. This j)articular specimen distinctly shows a well- 

 formed lobular tooth on the prehensile margin of the fixed finger of 

 each hand and a definite, though small, spined lobe near the base of 

 the outer margin of each movable finger.] 



A third species, A. intermedm., was proposed by Girard (1855, 

 p. 255) in his report on the Crustacea of the United States Naval 

 Astronomical Expedition. A discussion of the genus preceded a list- 

 ing of the two previously described species, A. laevis and A. denticu- 

 lata, and his description of the new one. This description does not 

 supply enough detailed information to permit the keying out of his 

 from the other species of Aegla. I have therefore not dealt with 

 Girard's species beyond this brief mention and on page 431 and page 

 448, footnote. Some day it may be found again at the type locality, 

 "the upper affluents of the Rio de Maypu, 2,000 feet above the level 

 of the sea, near Santiago [Chile] ," and perhaps be recognized by the 

 second row of spines on the carpus of the cheliped. Such a second 

 row of spines occurs in A. denticulafa but not in any of the other 

 known Chilean species, but the marginal toothing of the posterior 

 portion of the carapace at once sets the two apart. If Girard's A. 

 intermedia had possessed such toothing, surely he could not have 

 failed to see or mention it. 



