THE SPECIES OF AEGLA — SCHMITT 469 



inward ^^ for inside and often a little in advance of the anterionnost 

 of the longitudinal series there is one and sometimes two or more 

 almost equally strong, though usually somewhat more slender, spines 

 in an oblique row (the second spine of this row is always smaller 

 than the first and if there are additional spines they are in turn 

 smaller than the second one) ; anterior margin of merus with small 

 rounded lobe or tubercle. The inner margin of the ventral surface 

 of the ischium is armed with a well-developed spine anteriorly and 

 only a low swelling or slight nodulation at the posterior end. 



Anterior dorsal angle of the epimeron of the second (in lateral 

 view, the apparent first) abdominal somite much produced, ending 

 in a sharp corneous spine; anterior margin of this epimeron below 

 the spine slightly concave and nearly vertical in direction; ventral 

 angle very little less than a right angle, apically rounded off. 



Holotype. — The only large specimen, a male, in a lot of 2 males 

 and 4 females, of which the rest are all under 14 mm. in length of 

 carapace and rostrum taken together. This measurement in the holo- 

 type about equals 33.3 mm. These specimens were obtained by the 

 Captain Marshall Field Brazilian Expedition of the Field Museum, 

 October 20, 1936, 14 kilometers northeast of San Carlos, Uruguay, 

 Karl P. Schmidt collector, and are in collections of the Field Museum. 

 The holotype carries Field Museum number 2287; paratypes, 2288. 



Remarks. — This species is characterized by its long, slender ros- 

 trum, triangular in cross section, or, as one might say, ridge-roofed 

 rostrum ; the only slightly convex, more or less subrectangular, virtu- 

 ally uncrested hands; and by the distinctly marked hepatic lobes of 

 which the anterolateral angles of at least the first two and often all 

 three are spined. (See also "Remarks" under A. platensis and A. 

 prado.) 



Distribution. — This species seems to be widely distributed on both 

 sides of the River Plate, definitely eastward as far as Punta del Este, 

 Uruguay ; south and westward to Buenos Aires, Isla Flores, Belgrano, 

 and Lujan, Province of Buenos Aires, Argentina; north and west- 

 ward to Paysandu, Uruguay ; and Concordia and Parana, Entre Rios, 

 Argentina. One specimen, a small male, one of the Aeglas examined 

 by Nobili, from San Luis, Argentina, received from the Turin Mu- 

 seum, seems to be near, if not identical with,, this species. It is, 

 however, rather far removed from the above indicated range of A. 

 uruguayana. This may be due to the lack of collections from the 

 intervening region, or perhaps even to the lack of development of 

 the specific characters in this small specimen. 



I have seen specimens from the above-mentioned range-determining 

 localities and also from Paso de la Arena, Arroyo Miguelete (very 



^«A somewhat similar condition occurs in A. afftnis, p. 493. 



