NO. 2062. NEW ROTATORIA FROM PANAMA— HARRING. 539 



SO that the toe is a trifle broader in the middle than just beyond the 

 base. From the middle the toe tapers gently to the claw; in lateral 

 view it is slightly decurved and taperuig; there is a minute, but dis- 

 tinct spine projectuig dorsally over the claw. The depth of the body 

 is greater than that of any other described species of the genus; the 

 lateral sulci are almost obliterated in retraction; on account of the 

 flexibility of the membrane connectmg the dorsal and ventral plates, 

 its appearance is very variable. 



Total length, 96 /x; length of lorica, 76 ji; length of dorsal plate, 

 72 n, width, 66 //; width of ventral plate, 50 n; anterior spmes 55 fx; 

 toes without claw 19 ix, claw, 4 //; depth of body, 50 /i. 



While the contracted animal does not resemble Gosse's figure very- 

 much, the agreement is in the extended condition so strikmg that 

 there can be no doubt of the identification. When fully extended and 

 swimmmg, the length is veiy nearly twice as great, the body is slender 

 and flattened dorso-ventrally and the dorsal markings become much 

 more prominent. While Gosse's figure of the toes is not correct, the 

 same may be said of the majority of the species of this genus, with 

 which he had occasion to deal. 



Lecane flexilis is widely distributed; in the Panama collections it 

 was found in a creek flowing into Camacho Reservou- (3), common; 

 stagnant pool at Empire (4), common. Mr. Rousselet has sent me 

 specimens collected by Mr. Murray in Brazil; it is found here at Wash- 

 ington and in great abundance in collections from Loch Raven, near 

 Baltimore, Maryland, also ui material from the Bureau of Fisheries 

 station at San Marcos, Texas; I have found it in Sphagnum sent me 

 from various localities in England by Mr. David Bryce. 



Cathypna hrevis Miu-ray shows considerable resemblance to tliis 

 species; if the toes are correctly described it is, however, a good 

 species, 



LECANE ARCULA, new species. 



Plate 19, figs. 4-6. 



Cathypna aculeata Murray, Journ. Royal Micr. Soc, 1913, p. 350, pi. 14, fig. 28; 

 not Distyla aculeata Jakubski. 



The general form of the lorica is ovate and but little longer than 

 broad; the body is unusually thick. The dorsal and ventral anterior 

 margins of the lorica are both straight and nearly coincident; they are 

 produced laterally into two small, pointed spines, which are broad at 

 the base and directed sHghtly upward and outward. The dorsal plate 

 of the lorica is ovate and rounded posteriorly; it is strongly gibbous 

 and projects over the posterior segment of the body so far that it 

 nearly conceals it in a dorsal view. The dorsal markings are rather 

 faint; there are the usual four transvei*se rows of ridges, which are 

 fairly regular. The exact pattern can perhaps better be understood 

 from the figure than from any description. These ridges do not form 



