168 



hinge, anterior marginal curve long, arched; posterior shorter, nearly 

 straight, lower end of the valve obtusely pointed. 



Highest point of the valve one-third from the hinge and two fifths from 

 the posterior margin. The ocular tubercle is small, close to the hinge and 

 some distance from the anterior end. The posterior slope of the valve is 

 flattened. The cardinal slope of the surface of the valve has a broad 

 shallow furrow extending down nearly to the highest part of the valve. 

 The arched anterior sloped surface of the valve is evenly curved down to 

 the border. 



Sculpture. The surface of the shell has been corroded, and the pitted 

 surface is obscure. 



Size. Length, 3 mm.; width, 3| mm.; depth, 1 mm. 



Horizon and locality. Assise E. 3/., Upper Etcheminian, at Gillis' 

 Indian brook, Escasonie, N.S. Scarce. 



Escasona (?) 

 vetus. 



ESCASONA (?) VETUS. PI. XIII, figs. 6 a and b. 



Can. Rec. Sci. Montreal, 1902, p. 458. 



This form, represented by a right (T) valve, has a more rounded surface 

 than the type, and the valve is flatter. No ocular tubercle is determin- 

 able. The hinge line is very long (sixth-sevenths of length) and there is 

 a shallow furrow extending from it on the cardinal slope of the valve. 

 The valve is most tumid toward the posterior (?) side ; and the ventral 

 angle is vertically behind the end of the cardinal line. A broad thick- 

 ened band runs around the supposed posterior margin. 



Sculpture. The shell is minutely pitted, but it is mostly decorticated. 

 Size. Length, 3 mm. ; width, 3 mm. ; depth, f mm. 



Horizon and Locality. Assise E. 1 d. Lower Etcheminian, at Boun- 

 dary brook, Escasonie, N.S. 



Escasona (??) 



ingens. 



ESCASONA (HI) INGENS, PI. XIII. figs. 7 a to c. 



Can. Rec. Sci., Montreal 1902, p. 459. 



Only one valve known. The unusual form agrees with none of the 

 other genera of the Etcheminian Ostracods. It appears to be a left valve 

 and is so described here. The outline is obliquely subtriangular and 

 somewhat wider than long. 



The hinge line is three-quarters of the length of the valve ; a shallow 

 furrow runs parallel to the hinge, and near it for two-thirds of the length 



