542 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.47. 



LECANE AEGANEA, new species. 



Plate 21, figs. 1-3. 



The body is moderately elongate-oval and not very thick; the ante- 

 rior dorsal margin is shghtly convex and the ventral margin straight; 

 they do not meet when the head is retracted, but leave the lorica 

 partly open; no anterior spines are present. The dorsal plate is oval 

 and rounded posteriorly; the markings are fairly regular and not 

 very conspicuous. The ventral plate is larger than the dorsal and 

 projects beyond it, except in front; its markings are prominent, espe- 

 cially on the posterior half. The lateral sulci are not very deep and 

 the enthe lorica quite flexible. The posterior segment of the body is 

 inconspicuous; the coxal plates are very small and semicircular. 

 The first foot joint is veiy long, but almost obHterated near the mid- 

 dle; the second joint is large and has a sharp constriction immedi- 

 ately in front of the toes, which are moderately long, slender, and 

 nearly straight, and end in a very long, shghtly recurved and delicate 

 claw. 



Total length, 110 fx; length of lorica, 76 /j.; length of dorsal plate, 

 70 jn, width 56, /x, mdth of anterior edge, 42 ji; Avidth of ventral plate, 

 60 /I, anterior edge, 50 jn; toes without claw, 24 //, claw, 10 /n; depth 

 of body, 36 /z. 



Type. — Cat. No. 16577, U.S.N.M., is from a pool near the railroad, 

 between Black Swamp and Gatun (2); it is not common. 



LECANE DORYSSA, new species. 

 Plate 21, figs. 4-6. 



The body is but Httle longer than broad and excessively thick and 

 clumsy. While the outUnes are wavy and somewhat indefinite, the 

 lorica is nevertheless quite firm and may perhaps best be described 

 as leathery. The anterior dorsal margin is shghtly convex and 

 sinuate, as the dorsal ridges reach to the edge; the ventral edge is 

 almost straight and there are no frontal spines. The dorsal plate is 

 nearly circular, shghtly truncate posteriorly, and is very deeply 

 marked; the anterior row of ridges is somewhat irregular, while the 

 second row is entirely broken up with the exception o*f the median 

 field ; the two posterior rows are regular. The ventral plate is shghtly 

 narrower than the dorsal and nearly parallel-sided in its entire length, 

 but narrows abruptly to the posterior segment. The ventral mark- 

 ings are very prominent, especially so on the median field, which in 

 outhne approximates a reversed shield. The lateral sulci are shallow 

 and much wrinkled. The posterior segment is large and projects 

 considerably beyond the dorsal plate ; the coxal plates are large and 

 rounded. The first foot joint is prominent, much constricted near 



