75 



This little species is only known from a ventral valve. It is even 

 smaller than L. atavus of the Etcheminian terrane and is flatter along 

 the sides. 



LlNGULEPIS PUMILA, N. SP. PL. VII, FIGS. 5a AND b. 



Shell thick and long-ovate. Lingiilepis 



pumila. 



Ventral valve somewhat ridged toward the beak, which is much pro- 

 longed. 



Interior. The imprint of the foraminal groove on a mould of the valve 

 extends one third of the length of the valve, and a faint imprint of the 

 callus one-half the length or more. The dorsal is ovate with an obtuse 

 back and straightened sides. At the front half of the valve are several 

 strong concentric ridges, about seven in the space of a millimetre ; behind 

 these are others, more faintly marked. Interior. A small exfoliated 

 valve shows a median sulcus and faint print of muscle scars about the 

 middle of the valve. 



Sculpture. This consist of irregular concentric ridges, about six in the 

 space of a millimetre, near the back the concentric ridges are much more 

 minute. 



Size. Length of the ventral valve 6 mm.; width, 4Jmm.; depth, 1 mm. 

 The dorsal is about 1| mm., shorter than the ventral. 



Horizon and locality. Gray shales of the Coidbrook terrane at Dugald 

 Brook, Escasonie. 



LlNGULELLA cf. LONGOVALIS. Plate VII, fig. 2. 



A single example of a thin shelled Lingulella of the form and size of Lingnlella cf. 

 the above named species of the Lower Etcheminian Fauna was found. 

 The outline has been preserved by a filling of calcium phosphate. The 

 margin is somewhat acutely rounded in front, and the sides, somewhat 

 flattened, are evenly curved from near the hinge. The valve has two or 

 three strong growth grooves. 



Sculpture. This consists of fine irregular wavy ridges, made visible by 

 the lens ; there are about 6 ridges in the space of a millimetre. The 

 ridges are irregularly granulated along the crest, the granulations being 

 obscurely arranged in rows diverging from the apex ; on the lateral slopes 

 for a short distance, these low tubercles form more distinct curved ridges 

 radiating from the direction of the umbo. 



Size. Length 7 (?) mm. ; width 5 mm. 



