528 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 47. 



PLEUROTROCHA SORDIDA (Gossc). 



Proales sordida Gosse, Hudson and Gosse, Rotifera, 1886, vol. 2, p. 37, pi. 18, fig. 7. 

 A single specimen, with some doubt referred to this species, from 

 a pool near the railroad, between Black Swamp and Gatun (2). 



DIASCHIZA AURICULATA (Muller). 



Diaschiza lacinulata Levander, Acta Soc. Flora Fauna Fennica, vol. 12, No. 3, 

 1894, p. 43. 

 A few specimens from Rio Trinidad, just above Agua Clara (10). 



DIASCmZA FORFICATA (Ehrenberg). 



Diaschiza caeca Dixon-Nuttall and Freeman, Journ. Royal Micr. Soc, 1903, p. 

 134, pi. 4, fig. 11. 

 A few specimens from each of the following localities: Creek flow- 

 ing into Camacho Reservoir (3); Rio Trinidad, in weeds along shore 

 at Agua Clara (10) and Escoval (11), 



DIASCHIZA GIBBA (Ehrenberg). 



In creek flowing into Camacho Reservoir (3); not abundant. 



DIASCmZA GRACILIS (Ehrenberg). 



A few specimens in the same collection as DiascTiiza gihla (3). 



MONOMMATA ORBIS (Miiller). 



Monommata longiseta Bartsch, Jahresh. Naturk. Wiirttemberg, vol. 26, 1870, p. 

 344. 

 A few specimens from a pool near the raiboad, between Black 

 Swamp and Gatun (2); also from creek flowing into Camacho Reser- 

 voir (3) and in Rio Trinidad, at Escoval (11). 



DICRANOPHORXJS FORCIPATUS (Muller). 



Diglenaforcipata Ehrenberg, Abh. Akad. Wiss., Berlin (for 1831), 1832, pp. 137, 



154, pi. 4, fig. 10. 

 1 Diglena grandis Ehrenberg, Abh. Akad. Wiss., Berlin (for 1831), 1832, p. 137. 



Typical specimens of this species occurred in the following locahties: 

 Slow stream in garden of Isthmian Canal Commission, Empire; 

 pool between Black Swamp and Gatun (2) ; creek flowing into Camacho 

 Reservoir (3) ; stagnant pool at Empire (4) ; Rio Grande Reservoir 

 (5); Rio Grande, river (6). Specimens with straight toes, about 

 55 {X long, agreeing with published figures of D. grandis, were found 

 in Rio Trinidad (9) and a stream in garden of Isthmian Canal Com- 

 mission, Empire. As far as could be determined from the partly 

 contracted specimens, they agreed with a single specimen collected 

 near Boston and sent me for comparison by Mr. Rousselet, who 

 informs me that he has always considered D. grcmdis a synonym 



