NO. 2062. NEW ROTATORIA FROM PANAMA— EARRING. 543 



the middle, and reaches down on the second joint as a broad lobe 

 with a blunt pomt. The second joint is subsquare and very large; 

 it projects beyond the lorica for more than two-thirds of its length. 

 The toes are short and sHghtly compressed; the claw is nearly as 

 long as the toe, very slender and straight. 



Total length, 106 ft; length of lorica, 70 p.; length of dorsal plate, 

 58 //, width, 60 //, width of anterior margin, 52 /'.; width of ventral 

 plate, 58 ft, width of anterior margin, 56 /x; length of toe without 

 claw, 17 p., claw, 13 /«; depth of body, 45 /i. 



Type.— C&t. No. 16576, U.S.N.M., is from a pool near the raihoad 

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



The nearest relative of this species is L. Jiornemanni, which rivals 

 it in thiclmess of body and also resembles it in general appearance. 

 The lorica of L. Jiornemanni has deeper wrinkles of a different pat- 

 tern ; the toes are quite different, and the pecuhar coxal plates, ending 

 in points close to the foot, also distinguish it from L. doryssa. 



LECANE HORNEMANNI (Ehrenberg). 



Cathypna hornemanni Murray, Journ. Royal Micr. Soc, 1913, p. 349, pi. 14, 

 fig. 26. 

 From a pool near the railroad, between Black Swamp and Gatun 

 (2), few; from water plants near railroad bridge, Gatun Lake, com- 

 mon; creek flowing mto Camacho Reservoir (3), few; Rio Grande 

 Reservoir (5), abundant; Rio Grande (6), few; Rio Trinidad, above 

 Agua Clara (10), few. 



LECANE TENUISETA, new species. 

 .Plate 22, figs. 1-3. 



The outhne of the body is a shghtly elongate oval; the anterior 

 margins are parallel and usually a trifle convex in the median haK of 

 then- width ; they leave the lorica partly open in retraction, as they 

 do not quite meet. The body is fairly tliick. The dorsal plate is 

 oval, rounded posteriorly, and without markings; it is strongly 

 gibbous and bends down considerably even in front. The ventral 

 plate is of the same width as the dorsal and similar outline; its mark- 

 ings consist of a few ridges, shown in figure 1, The lateral sulci are 

 very shallow. The posterior segment of the body is broad and 

 rounded and projects considerably beyond the dorsal plate; the 

 coxal plates are large and semicircular. The first foot joint is 

 narrow and parallel-sided, and reaches down on the second joint as a 

 bluntly pomted lobe. The second joint is broad, rounded anteriorly, 

 and constricted immediately in front of the toes, which are slender, 

 slightly compressed, and rather short. The claw is more than two- 

 thirds the length of the toe, very slender, recurved and outcurved. 

 The lorica is membranous and very flexible. 



