STAURASTRUM. 165 



Numerous in small pools, on the banks of river, Bethlehem, 

 Pennsylvania. 



The end view has a resemblance to Nordstedt's St. gemeMi- 

 parurn, but front view is quite distinct. 



ST. DISTENTUM, Wolle. Plate LII, figs. 15, 16. 



Small, smooth ; semi-cell obovate, end convex crenulate, 

 sides in upper portion laterally produced into nearly straight 

 elongated arms, margins smooth ; apices divided into three 

 parts and distended ; end view five or six radiate ; rays taper 

 from a broad base to a distended trifid end. Between each 

 two of the bases is a deep linear sinus. 

 Diameter 40 /<., more or less. 



Ponds, Denmark, Splitrock, Passaic County, N. J. 



ST. KITCHELII, Wolle. Plate LT, figs. 35, 36. 



Cells smooth, about as long as wide ; semi-cells subelliptic, 

 bases more inflated than the ends, the angles produced into 

 bifurcate processes; semi-cells furnished with three addi- 

 tional processes ; end view triangular, angles produced, 

 apices bisected ; on the top surface three bifurcate processes, 

 one extending over each of the three sides; membrane 

 smooth or finely punctate. 



Diameter 38-50 yw. 



Collected by Rev. H. D. Kitchel, in Gilder Pond, Mount 

 Everett, Mass. 



St. spinosum, Ralfs, bears some similarity, but is separated 

 by having two or more spines on each side besides the one 

 terminating each angle. St. furcrttum, Ehrb., also appears 

 related, but is possessed of more spines. 



ST. FURCATUM, (Ehrb.), Breb. Plate LI, figs. 40, 41; Plate LIX, 



figs. 15, 16 ; Plate LXIII, fig. 34. 



Cells smooth, about as long as wide, sometimes shorter, 

 furnished with numerous processes always more or less 

 widely furcate at the apices; end view triangular, angles 

 somewhat produced and furcate; sides each with two, or 

 rarely three, furcate processes; normally a semi-cell has nine 

 processes, one at each angle and two on each side between 

 the angles; in front view, more or less broadly elliptic, 

 angles drawn out and furcate; the end margin 1ms usually 

 four processes visible, projecting over the margin. 



A variable form separated from jin-i-it/< nun, >nxt<i>li<iiuun 

 and others not only by the smooth, or punctate membrane 



