534 PROCEEDIXGS OF THE NATIONAL MUSEUM. vol.47. 



The first foot joint is large and bulbous; it is at least possible that 

 this really corresponds to the posterior segment of the body in other 

 species of Lecane. The second foot joint is square and unusually 

 long; it projects for nearly its entire length beyond the lorica. The 

 toes are long, slender, and tapering, slightly curved at the base; the 

 claw is nearly one-third the length of the toe, conical and not curved. 



Total length, 135 /«; length of lorica, 90 fx; width of anterior points, 

 inner edges, 52 //; length of dorsal plate, 75 //, width, 45 /i; width of 

 ventral plate, 60 /i; toe without claw, 30 /i, claw, 9 n; depth of body, 

 43 ,«. 



Tyjpe.^Csit. No. 16578, U.S.N.M., from a stagnant pool at Empire 

 (4), where the species is common; it occurred also in a pool near the 

 railroad, between Black Swamp and Gatun (2), common; Gatun 

 Lake, among water plants near the railroad bridge, few; creek flowing 

 into Camacho Reservoir (3), abundant; Rio Grande Reservoir (5), 

 abundant; Rio Grande (6), few. 



This is no doubt the animal recorded by Jeimings ^ and figured 

 under the name Distyla gissensis Eckstein, from specimens collected 

 in a swamp near the fish hatchery on South Bass Island in Lake Erie. 

 The original description does not fit L. crepida any better than it 

 does any other knowTi Lecane; it is doubtful whether Eckstein's 

 species is now identifiable. 



Lecane crepida has but one close relative, L. ( = Cathypna) hastata 

 (Murray) ; the similarity is not, however, so close that there can be 

 any question of identity. Whether these two species represent a 

 primitive branch of the genus or a highly speciaUzed one is uncer- 

 tain; that they may have retained more of the ancestral characters 

 than any other known species is not improbable. 



LECANE LUNA (Miiller). 



Cathypna luna Gosse, Hudson and Gosse, Rotifera, 1886, vol. 2, p. 94, pi. 24, fig. 4. 

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

 (2), common; creek flowing into Camacho. Reservoir (3), common; 

 stagnant pool at Empire (4), abundant. 



LECANE PAPUANA (Murray). 



Cathypna papuana Murray, Joiirn. Royal Micr. See, 1913, p. 551, pi. 22, fig. 2. 

 This species is widely distributed on the Isthmus, but usually in 

 small numbers: Gatun Lake, near railroad bridge, few; stagnant 

 pool at Empire (4), few; Rio Grande Reservoir (5), few; Rio Grande 

 (6), few; bayou of French Canal, about 2 miles south of Gatun, 

 abundant; Rio Trinidad, at Escoval (11), few; pond at Miraflores 

 (12), few. 



1 Bull. U. S. Fish Comm., vol. 19, 1900, p. 91, pi. 20, figs. 33, 34. 



