NO. 2164. REVISION OF ROTATORIAX GEXERA—HARRIXG. 545 



gradually and very gently throughout their Jength. The posterior 

 end of the lorica is slightly emarginate. 



The foot is very robust and about one-fourth the length of the 

 lorica. No sensory pit has been observed on the third foot joint. 

 The stout toes are as long as the foot; they are nearly parallel sided 

 for half their length and from there taper gently toward the point- 

 They are not, strictly speaking, decurved ; the lower or ventral edge 

 is almost straight, while the dorsal edge curves downward to the 

 point. 



Total length, 135 (x; length of lorica 105 n, width 66 fi; anterior 

 points, 28m; depth of dorsal sinus, 12 ju, of ventral sinus, 24 /x; length 

 of foot groove, 33 n, anterior width, 16 ix, posterior width, 18 /x; 

 length of foot, 24 /.i, of terminal joint, 9 n; length of toes, 27 m; 

 depth of body, 30 fx. 



Lejyadella qiiinquecostata was found by Lucks in various locahties 

 near Danzig, Germany; Murray collected it at Sydney, Australia, 

 and Kio de Janeiro, Brazil; by the writer it has been found in the 

 Panama collections, made by Dr. C. Dwight Marsh from Rio Grande 

 Reservoir, as well as in local collections from Kenilworth, District of 

 Columbia. It usually occurs in small numbers only. 



7. LEPADELLA CRYPHAEA, new species. 



Plate 92, figs. 9-12. 



The lorica is distinctly pyriform in outline; it is prolonged poste- 

 riorly as a bluntly pointed or slightl}^ angulate projection with dis- 

 tinct basal inangulations. The cross section of this projection is 

 triangular, and there is a fairly well marked median ridge; from the 

 lateral angles an inconspicuous line continues forward to a point even 

 with, and a little inside of, the lateral antennae. The dorsal plate is 

 evenly rounded, its edges slightly overhanging the nearly flat ventral 

 plate. The cross section of the body is approximately semicircular. 

 The width of the lorica is three-fifths and the depth of the body 

 one-third of the length of the dorsal plate. 



The anterior margin is very narrow, about one-fifth of the length 

 of the lorica. The dorsal sinus is broadly U-shaped; its depth is 

 about half the width of the anterior margin. The ventral sinus is 

 slightly elliptic and bluntly pointed posteriorly; the depth is three- 

 fourths of the width. There is a stippled collar on both the dorsal 

 and the ventral plate. 



The foot groove is a Uttle more than one-third the length of the 

 lorica; its sides converge somewhat toward the posterior projection. 

 The foot is rather slender and projects very httle beyond the lorica; 

 its three joints are of nearly equal length. The toes are slender and 

 taper gradually to fine points; their length, one-fourth that of the 

 36399°— Proc.N.M.vol.51— 16 35 



