PACKARD.] PHYLLOPODS OF NOETH AMERICA. 309 



Sis specimens from Dubnque, Iowa, collected by Eev, A. B. Kendig. 



Six specimens from "Grindstone Creek, half way from Fort Pierre to 

 the Bad Lauds, Dakota," collected by Dr. F. Y, Hayden, and received 

 from the Chicago Acadeciy of Science through Dr. Stimpsou. 



The smallest specimen from Dakota agrees exactly with the Iowa ex- 

 amples in being long, ovate; the others are considerably larger and 

 with age seem to grow broader, more wedge-shaped. The following are 

 the dimensions of the most wedge-shaped examples ; length, 14™"^ ; 

 height, 10.5°^'^. 



Dilfers from any of the preceding species by the full globose higher 

 shell, with more i^rominent and central beaks, and the shorter oviger. 



EsTHERiA BELFRAGrEi Packard. 



Plate III, figs. 1, 2, 4, 6 ; XXIV, fig. 1. 



Esiheria lelfragei Packard, Amer. Journ. Sc, II, Aug., 1871. 



Hayclen's U. S. Geol. Surv. Terr, for 1873, 619, PI. Ill, fig. 8, 1874. 



Shell (Fig. 11 in text) or carapace valves with the beak situated be- 

 tween the anterior third and the middle of the shell; dorsal edge straight 

 for a very short distance behind the beak, slightly serrate, bent rather 

 suddenly downward at two-thirds of the distance 

 from the beak to the posterior end, the end being ^ .<5^^^^^~- 

 very full and rounded ; the anterior dorsal edge v 



slopes down rapidly from the beak, and the an- / \ 



terior end is full and convex. Beak very full and I ^ ' 



f»romineut, more so than in any other species ex- \ y' 



cept JE.jonesii, but they are not oblique. About """~-v_ " 



twenty-four lines of growth, between which the _, ., t. ♦!, • , if „ • 



, ,, y , u. ^ J - o 1 i. / 1 ^i''- 11.— Esthena belfragei, 



shell IS coarsely punctate ; trom o-8 dots (when enlarged about four times. Em- 

 placed in a straight line) between the lines of ®^'°^ '^*^^- 

 growth in central part of the shell; these punctures are reduced to a 

 single row on the edge. In a piece taken from the edge of the shell and 

 highly magnified (Plate XXIV, fig. 1) there are seen to be two rows of 

 setse, one very short and thickset, the row of larger ones very long and 

 slender arising at some distance from the edge of the shell. The punc- 

 tiform markings are seen to be large with scattered masses of denser 

 tissue than that inclosing them. Second antennse with 14 joints in the 

 upper, and 15 joints in the lower ramus of the flagellum. In the two 

 anterior pairs of legs of the male, the lower division of the tlabellum is 

 rather broad and short, while the gill is moderaten in size and rather 

 short; the hands are rather small, of the general shape of _£/. mexicana, 

 but the claw is a little shorter. There are along the back seventeen 

 pairs of dorsal si)ines exclusive of those on the telson, which are fifteen 

 in immber (in E. mexicana they are much more numerous), and the mid- 

 dle one is much larger than those near it. Caudal appendages longer 

 and slenderer than in E. mexicana^ and the terminal spine is longer and 

 slenderer. 



Length of shell, 7.5™""; height, 6'"'"; transverse diameter, ± 3.8"™. 



Six specimens, Waco, Tex., April (G. W. Belfrage). 



This fine species differs from E. morsel^ its nearest ally, in having a 

 much shorter and higher shell with the larger beaks nearer the anterior 

 end. 



