554 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 47. 



the rounded lateral lobes, is 300//, width, 275/t; length of spine, 40/f. 

 T. mucronata (Gosse) has an anterior spine, but in specimens of this 

 species from Mexico City it is broad at the base and without the 

 lateral lobes of T. trilobata. Mexican specimens measure 150 j« 

 (Gosse and Weber give the size as 140 //), which would hardly appear 

 compatible with the specific identity of the two forms. Whether 

 Klrkman's specimens really belong to T. trilobata is a matter of some 

 doubt. It is not evident from the original description that T. trilo- 

 hata differs materially from T. intermedia Andei-son and both are 

 probably synonjTnous with T. patina (Hermami). The pecuhar 

 structure of the ovary described by Rousselet in a note to Kirkman's 

 paper is not mentioned by Anderson and Shephard; it is even more 

 pronounced in the Black Swamp specimen, the left half of the ovary 

 having three distinct branches. This species occurs also in collec- 

 tions made by Dr. Chancey Juday, of the University of Wisconsin, at 

 Los Amates, Guatemala. Daday found it in Paraguay, describing it 

 as Pterodina mucronata Gosse;* he notes the resemblance in the 

 structure of the ovary to Kirkman's animal. 



TESTUDINELLA PATINA (Hermann). 



Pterodina patina Ehrenberg, Abh. Akad. Wiss. Berlin, 1830, p. 48. 



In a collection from the railroad bridge over Black Swamp (1), 

 rare; creek flowing into Camacho Reservoir (3), rare; stagnant pool 

 at Empire (4), few. 



PEDALIA MIRA (Hudson). 

 PedalioniniraB.VDSON, Monthly Micr. Journ., vol. 6, 1871, p. 121, pi. 94, figs. 1-4. 



Abundant in Gatun Lake; Rio Grande Reservoir (5), rare; CarabaU 

 (Gorgona) Reservoir, rare; pond at Miraflores, back water of Rio 

 Camitillo (12), common. 



FILINIA LONGISETA (Ehrenberg). 



Triarthra longiseta EhrenberCx, Abh. Akad. Wiss. Berlin (for 1833), 1834, p. 222, 

 pi. 8, fig. 1. 



In Gatun Lake, few; back water of Rio Chagres at Las Bocas del 

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

 few. 



FLOSCULARIA RINGENS (Linnaeus). 

 Melicerta ringens Schrank, Fauna Boica, vol. 3, pt. 2, 1803, p. 310. 

 From Rio Trinidad, above Agua Clara (10), few. 



LIMNIAS CERATOPHYLLI Schrank. 



Among weeds in Rio Trinidad, at Escoval (11), few. 



' Daday, E. von, Siisswasser-Mikrofanna Paraguays, 1905, p. 116, pi. 6, fig. 20. 



