544 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.47. 



Total length, 106 pt, length of lorica, 73 fi; width, 56 n, length of 

 dorsal plate, 64 /i, width of anterior edge, 45 /i; width of anterior 

 edge of ventral plate, 52 fx, length of toe without claw, 20 pi, claw, 13 /i. 



Isthmian specimens are from a creek flowing into Camacho Reser- 

 voir (3), where the species is common. 



Type.-^Sit. No. 16579, U.S.N.M., from Kenilworth, District of 

 Columbia, where the species occurs in Sphagnum. It is found also 

 in material collected near the Bureau of Fisheries station at San 

 Marcos, Texas. As the Washington specimens are better preserved, 

 the description and measurements are taken from these. Isthmian 

 specimens are considerably smaller, but do not otherwise differ 

 materially. 



This species bears considerable resemblance to L. aeganea; the 

 difference in the toes and the markings of the lorica are sufficient to 

 distinguish the two. 



LECANE AMORPHA, new species. 

 Plate 23, figs. 1 and 2. 



This species is virtually illoricate and on account of the great 

 flexibility of the integument the contracted animals vary very much 

 in appearance. The body is unusually elongate and nearly parallel- 

 sided; the anterior margin is the irregularly puckered edge resulting 

 from the inversion of the head. The posterior half of the body 

 shows rudimentary lateral sulci. The posterior segment of the body 

 is normally developed, broad and rounded; the coxal plates are large 

 and semicircular. The first foot joint is narrow and parallel-sided, 

 the second subsquare, shghtly wider posteriorly. The toes are short, 

 straight, and slender; the claw is nearly as long as the toe, slender, 

 tapering, obtusely pointed, and shghtly recurved. 



Total length, 105 //; length of body, 80 /i, width, 40 //; length of 

 toes without claw, 14 n, claw, 10 pt; depth of body, 30 pt. These 

 measurements are only average ; owing to the flexibiUty of the integ- 

 ument any number of different measurements may be obtained. 



Type.—Csit. No. 16580, U.S.N.M., from Rio Trinidad at Escoval 

 (11), in weeds along shore, where it is common. It is also found 

 here at Washington in Sphagnum from Kenilworth. 



LECANE ELEGANS, new species. 



Plate 23, figs. 3 and 4. 

 The body is elongate, slender, and paraUel-sided; the dorsal plate 

 is very flexible, the ventral much less so. The anterior margin of the 

 ventral plate is nearly straight and of fairly constant form; the dorsal 

 margin is irregularly puckered by the inversion of the head. The 

 dorsal plate is strongly convex, nearly semicircular in cross section. 

 Lateral sulci are barely indicated on the posterior third of the body; 



