NO. 2032. ROTATORIA OF WASHINGTON AND VICINITY— EARRING. 395 



preserved specimens, two faintly orange-colored globules appear 

 behind the auricles when the tissues are dissolved in potassium hypo- 

 chlorite; no doubt these are identical with the eyespots of other 

 members of the genus. 



The contractile vesicle and ovary are normal; the foot-glands are 

 large and lead by a narrow duct to a mucus reservoir at the base of 

 the toes. 



The trophi are forcipate and shghtly asymmetric. The fulcrum is 

 a thm triangular plate; the rami are stout, -with rather blunt points; 

 on their ventral side well- developed alulse serve for the attachment 

 of the abductor muscles. The right uncus has two teeth, which form 

 a fork, embracing the ramus; the left uncus is a flat triangular plate, 

 reenforced by ribs and resting on a flattened portion of the ramus. 

 The manubria are also slightly dissimilar, the left one being the more 

 strongly developed and a httle posterior with respect to the position 

 of the right manubrium. 



Total length, 240 /i; toes, 33 /z; trophi, 37//. 



Ti/pg.— Cat. No. 16517, U.S.N.M., was collected at Kenilworth, 

 District of Columbia, in a weedy pond among branches of Myriophyl- 

 lum in incipient decay. 



This species appears to be the one described by Gosse ^ as Diglena 

 caudata Ehrenberg. A comparison of Ehrenberg's figure and descrip- 

 tion in Die Infusionsthierchen with Gosse's Diglena hirapMs shows, 

 however, that these are beyond doubt identical, so that a new name 

 is necessary for the misdetermined animal. 



ENCENTRUM MYRIOPHYLLI, new species. 

 Plate 34, figs. 1-3. 



The body is moderately stout and slightly gibbous dorsally; a large 

 frontal ligula overarches the corona. Posteriorly the body tapers 

 gradually to the short foot; the toes are very shghtly decurved and 

 end in fine points. 



The corona is very oblique, and has prominent auricles. The gang- 

 Uon is rather small; the retrocerebral sac is pyriform and reaches to 

 the stomach. At the base of the ligula are two moderately large 

 eyespots. 



The forcipate trophi are notable for the reduction of the maUei; 

 the incus, on the contrary, is unusuaUy powerful. The fulcrum is a 

 rather short, broad, and thin plate, rounded posteriorly; the rami 

 are very large at the base and taper to stout, incurved points. The 

 manubria are long, very slender, round rods with a double curve in 

 the dorso- ventral plane; the unci, as usual in this type of mastax- 

 have but a single tooth, which is also long and slender; the needle, 



' The Rotifera, vol. 2, p. 51. 



