N0.21G4. REVISION OF ROTATORIAN GENERA— BARRING. 549 



Total length, 180 /x; length of lorica, 114 m, width, 85-100 m; 

 width of anterior margin, 35 m; depth of ventral sinus, 24 n; length 

 of foot groove, 24 n, posterior width, 30 ix; length of foot, 30 fx, of 

 last joint, 12 (x; length of toes, 45 m; depth of body in median plane, 

 43 ju; from highest point of dorsal plate to edges of lorica, 52 ix. 



Type.— Cat. No. 16829, U.S.N.M., was collected in weedy ponds 

 at Kenilworth, District of Columbia. It is fairly common. Mr. 

 Murray brought me a specimen which he collected at Sydney, 

 Austraha. 



The corona, figures 5 and 6, and the trophi, figures 7 and 8, have 

 been described in the introduction, so that a repetition is unnec- 

 essary. 



Lepadella, henjamini is easily recognized by the great dorso- ventral 

 depth of the body and the overhanging edges of the lorica, recalling 

 EucJilanis fyriformis, as well as by the very short foot groove and the 

 imusually long toes. It is surpassed in size only by L. ovalis 

 (Miiller), while the actual bulk is probably greater. 



This species has been named for Dr. Marcus Benjamin, editor of 

 the publications of the United States National Museum. 



11. LEPADELLA CYRTOPUS Harring. 



Plate 93, figs. 13-16. 



Lepadella cyrtopus Harring, Proc. U. S. Nat. Mus., vol. 47, 1914, p. 550, pi. 16, 

 figs. 6-8. 



The body is broadly oval and usually somewhat truncate pos- 

 teriorly. The dorsal plate is evenly rounded, and its edges do not 

 project below the level* of the ventral plate. The latter is nearly 

 flat, with a very shallow longitudinal depression near each lateral 

 edge. The width of the body is equal to four-fifths of the length 

 of the lorica; its cross-section is semicircular. 



There is no distinct dorsal sinus, but the anterior margin of the 

 dorsal plate is slightly concave. Its width is one-third the length 

 of the lorica. The ventral sinus is very deep, about four-fifths of 

 its anterior width, and subcircular in outUne. A bead-hke tliick- 

 ening of the dorsal and ventral edges of the opening for the head is 

 present, but no stippled coUar. 



The foot groove is short, broadly U-shaped, and its sides slightly 

 divergent posteriorly. Its length is one-fourth the length of the 

 lorica, and the width is very nearly the same. The posterior margin 

 of the lorica varies from the broadly truncate form of figure 13 to 

 that of figure 14, where the truncation is very slight. 



The length of the foot is two-fifths the length of the body, the 

 second joint being nearly half the entire length. The toes are 

 short, less than one-fourth the length of the lorica, and strongly 



