215 



Description. Very elongate, ovate ; width to the length about as 9 to- 

 24 ; front broadly rounded, with a portion in the middle straight ; sides 

 straight and parallel ; apex of dorsal valve about 90 ; cardinal slopes on 

 each side of the beak nearly straight, or gently convex, forming an obtuse 

 rounded angle with the sides at about one-fourth the length. The shell 

 is strongly convex in the upper half, and wedge-shaped in the lower half. 

 Surface concentrically marked, with fine striae, and a few obscure radia- 

 ting lines, as in most species of this genus. 



Length of large specimen 2 inches ; width 9 lines. This species is 

 closely allied to L. Philomela (ante, p. 49), but has the sides straighter, 

 is proportionately more convex in the upper half, and is destitute of the 

 groove along the median line. 



It is not so nearly pentagonal as L. Lyelli. 



Locality and Formation. N, Table Head, Newfoundland : Quebec 

 group. 



Collector. J. Richardson. 



LlNGULA lOLE. (N. Sp.) 

 a / 6. 



f .; 



Fig. 199. Fig. 200. 



Fig. 199.- L ~iing > wZa lole. a, &, c, rf, e, views of five different specimens. 

 200. L. Cyane. a, 6, c, d, views of four different specimens. 



Description. Shell small, ovate, ventral valve longer and more acute in 

 the rostral half than the dorsal ; apical angle from 45 to 60 ; greatest 

 width usually at about one-fourth the length from the front, thence taper- 

 ing to the beaks with gently convex sides ; front angles evenly rounded ; 

 front margin obtusely rounded. Dorsal valve with the beak obtuse, and a 

 rather convex umbo. Both valves rather strongly and uniformly convex ; 

 the ventral valve sometimes obscurely carinated on approaching the beak. 

 Surface obscurely striated, presenting a somewhat smooth shining aspect. 

 Length of ventral valve 3J- lines ; width 2J lines. Length of dorsal 

 valve 2| lines ; width 2J lines. 



This species is closely allied to L. Cyane, and occurs along with it in 

 the same beds, but differs in being more uniformly convex, in not being so 

 wide, and in not presenting the sub-pentagonal aspect of that species. 



Locality and Formation. P, four miles north-east from Portland 

 Creek, Newfoundland : Quebec group. 

 Collector. J. Richardson. 



