NO. 2062. N^W ROTATORIA FROM PANAMA— HARRING. 549 



The ventral plate is subsquare and much narrower than the dorsal. 

 As it is very flexible, the lateral margins are undulate and not very- 

 distinct. The wrinklmg of the median portion of the ventral plate 

 is constant and of the pattern shown in figure 4. The lateral sulci 

 are indistinct and shallow. The posterior segment of the body is 

 very short and broad; it is almost concealed by the dorsal plate. 

 The coxal plates are large and semicircular. The fii-st foot joint is 

 very small and parallel-sided, the second also rather small. The toe 

 is of moderate length and has a long, double claw, the two parts of 

 which are rarely separated. 



Total length, 84/t; length of lorica, 57/i; length of dorsal plate, 

 54/(; width 62/z; width of ventral plate, 56^; anterior edge of dorsal 

 plate, 34ju, of ventral plate, 45/i; length of toe without claw, 21 in; 

 claw, 6fi; depth of body, 42//. 



Type.— C&t. No. 16583, U.S.N.M., from Rio Grande Reservoir (5), 

 where the species is abundant. It also occurs in the following col- 

 lections: Pool near the railroad, between Black Swamp and Gatun 

 (2), common; Rio Grande (6), few; Rio Trinidad, above Agua 

 Clara (10), few. 



MONOSTYLA BIFURCA Bryce. 



From a creek flowing into Camacho Reservoir (3), common. 



LEPADELLA PATELLA (Muller). 



Metopidia emarginata Hudson and Gosse, Rotifera, Suppl., 1889, p. 46, pi. 34, 

 fig. 6. 



While recorded only from Rio Trinidad, at Escoval (11), it is 

 quite probable that many specimens have been overlooked, as the 

 collections nearly all contained a considerable amount of floccose, 

 diatoms, desmids, etc. 



LEPADELLA SOLIDUS (Gosse). 

 Metopidia solidus Gosse, Ann. Mag. Nat. Hist., ser. 2, vol. 8, 1851, p. 201. 



In a creek flowing into Camacho Reservoir (3), common; Rio 

 Trinidad, above Agua Clara (10), rare. 



LEPADELLA TRIPTERA Ehrenberg. 



From Rio Grande Reservoh (5), common; Rio Grande (6), few. 



LEPADELLA IMBRICATA, new species. 

 Plate 16, figs. 3-5. 



The body is subovate, a little broader anteriorly. The lorica is 

 strongly gibbous with a very faint dorsal ridge; the ventral plate 

 also has a faint ridge, which only extends for about two-thirds of 

 its length. Two shallow longitudinal depressions extend the length 



