216 



LiNGULA Cyans. (N. sp.) 



Fig. 200, a-d. 



Descrijytion. — Shell small, siib-ovatc or obscurely pentagonal. Ventral 

 valve longer than the dorsal ; beak acute : apical angle about 60° ; great- 

 est rndth below the mid-length ; the upper half uniformly tapering;, ivith 

 nearly straight margins to the beak ; sides in the lower half gently con- 

 vex and sub-parallel ; anterior angles rounded ; a portion in the middle of 

 the front margin nearly straight. The dorsal valve is a little shorter than 

 the ventral, and more obtuse in the upper half. Both valves arc rather 

 strongly convex, but slightly flattened along the median line from the mid- 

 length to the front margin. Surface with fine concentric strite scarcely 

 visible to the naked eye, and with a few larger undulations of growth. 

 One specimen, under the magnifier, shews fine radiating strire. 



Length of ventral valve oi lines ; width, 3 lines ; length of dorsal valve 

 3 lines ; width the same. 



Locality and Formatiun. — ;P, four miles north-east from Portland 

 Creek, Newfoundland : Quebec group. 



Collector. — J. Richardson. 



OTHER SPECIES OE LINGULA. 



L. QuEBECENSiS, ante, p. 72, occurs m Division P, on the south side of 

 Cow Head. 



ACROTRETA GEMMA. (N. Sp.) 



Fig. 201. — ^crotreta gemma. The small outline figures indicate the natural size ; a and 

 c, dorsal valves ; 6, ventral valve, as seen from above ; rf, area of n ventral 

 valve which shews a central groove : /, area of another specimen which ex- 

 hibits no groove ; t, side view. 



Fig. 201. 



Description. — Shell very small, about 

 nearly flat, and the other, acutely conical. 



1 line in diameter ; ono valve 

 Dorsal valve very gently con- 



