NEW ROTATORIA FROM PANAMA— EARRING. 537 



LECANE LUDWIGII (Eckstein). 



Distyla ludwigii Eckstein, Zeitschr. Wiss. Zool., vol. 39, 1883, p. 393 pi 26 

 fig. 37. 



From a creek flowing into Camacho Reservoii' (3), few; pond east 

 of canal at Empire (8), few; Rio Trinidad, at Escoval (11), rare. 



LECANE MARSm, new species. 

 Plate 18, figs. 1-3. 



The outline of tlie lorica is a bluntly pointed oval; the anterior 

 margins of the dorsal and ventral plates are coincident and sHghtly 

 excavate. The anterior spines are long, slender, and slightly taper- 

 ing; the point is curved back as a conspicuous hook, in lateral view 

 nearly semicircular. The dorsal plate is ovate and unusually narrow 

 at the posterior end; its markings are quite reg-ular and prominent. 

 The ventral plate is narrower than the dorsal and of approximately 

 the same outline; the lateral sulci are deep. The posterior segment 

 of the body is rougiily triangular in outline, slightly narrowed at the 

 base of the rounded posterior lobe, which curves downward; on 

 the dorsal side there are two parallel, transverse ridges on each side of 

 the median line. The fu-st foot joint is barely distinguishable and the 

 second, movable joint is smaller than usual. At the sides of the 

 foot joints there are two semickcular rounded plates, free posteri- 

 orly and shghtly movable. These plates, for which the term coxal 

 plates is used in this paper, are present in aU the species of the genera 

 Lecane and Monostyla, even when no other trace of the lorica re- 

 mains; in some cases they are produced into posterior spines. The 

 toes of L. marshi are faiiiy long, straight and parallel-sided, ending 

 in bluntly conical points without any claw. The body is of a little 

 more than average depth. 



Total length, 173 f.i; length of lorica, 138 pt; width of anterior edge 

 over spines, 54 fx; height of hook, 9 pt; length of dorsal plate, 114 pt, 

 width, 84 p; width of ventral plate, 76 //; length of toes, 45 p; depth 

 of body, 60 p. 



Type. — Cat. No. 16571, U.S.N.M., from a stagnant pool at Empire 

 (4); it is apparently not common. It has been named for Dr. C. 

 Dwight Marsh, of Washington City. 



LECANE ERCODES, new species. 

 Plate 18, figs. 4-6. 



The lorica is oval in outline, ending posteriorly in a blunt, rounded 

 lobe; the anterior dorsal and ventral edges are coincident. The 

 dorsal plate is oval and truncate posteriorly; its markings are promi- 

 nent and, with the exception of the first row, fairly regular. The 

 ventral plate is slightly narrower than the dorsal and marked with 



