458 PROiCEEDICNGS OF THE NATIONAL MUSEUM vol. 91 



Family AEGLIDAE 

 Genus AEGLA Leach 



AEGLA PARANA, new species 

 FiGUEES 42, 43; Plate 25, A 



Description. — A large species attaining a length of carapace and 

 rostrum together of at least 44 mm. 



Carapace slightly convex anteriorly and laterally, medially quite 

 flattened ; front very wide. Rostrum long, slender-spinelike, sharply 

 carinated, ridge-roofed, triangular in cross section, exceeding eyestalk 

 by two to three times the length of the cornea ; crest of rostral carina 

 furnished with a closely juxtaposed double row of good-sized corneous 

 scales about to level of corneae, anterior to which the row becomes 

 single with scales often closely set, sometimes a bit separated from one 

 another; posteriorly the carina proper ends just before the anterior 

 margins of protogastric lobes, larger scales of carina often stop at 

 level of epigastric prominences. Epigastric prominences well marked, 

 though low tubercular, furnished with one or more, usually several, 

 corneous scales, individually about the size of the scales on the 

 rostrum ; anterior margin of protogastric lobes, though only slightly 

 raised, distinctly marked, in part at least, by a short row of sizable 

 corneous scales, of which the apical one is larger and heavier than 

 the others. Areola relatively long and narrow, lateral sutures of 

 cardiac area markedly converging behind. 



Orbits fairly wide, moderately deep, separated from the wide extra- 

 orbital sinus either side by a conspicuous strong yet slender spine; 

 the extraorbital sinus exceeds half the width of the orbital one, often 

 about equal to three-fourths of its width. 



Anterolateral spine long, strong, acuminate, reaching to middle of 

 cornea or beyond, sometimes nearly as long as eye. Anterolateral 

 angle of first hepatic lobe sharply and strongly spined, spine more 

 or less exserted, second lobe may also be spined, or, like the third, 

 carry a good-sized corneous scale. Angle on lateral margin behind 

 cervical groove spiniform and armed with one, usually several, 

 smaller, sharp, corneous-tipped spines on its posterior slope; angle 

 behind notch which follows the preceding angle also spined; entire 

 lateral margin of posterior portion of carapace (behind cervical 

 groove) conspicuously armed with a continuous fringe of sharp 

 spines; other species may have the corresponding margin more or 

 less small-spinulose or scabrous, but in none (except A. denticulata) 

 is it as strongly and well spined as in this one- 

 Large hand more or less subquadrate, thick, but not inflated or 

 particularly swollen looking, moderately rough scabrous, armed on 



