348 Fossils of the Calciferous Sandrock. 



Locality and formation. — Mingan Island, Calciferous Sand- 

 rock. 



Collectors. — Sir W. E. Logan, J. Richardson. 



These fragments indicate three species of Crinoidea, and they 

 are probably distinct from those that occur in the Chazy or any 

 other overlvinof formation. 



BRACHIPODA. 



LlNGULA LYELLI. (N. S.) 

 Fig. 1 — a, b } c, d. 

 Description. — Elongate oval or sub-pentagonal ; front margin 

 straight or gently convex; sides nearly straight and parallel in 

 the lower two-thirds of the length, above which they converge 

 and meet at the beak at an angle of about forty-five degrees. 

 Both valves are moderately, but not regularly convex, there 

 being a flat triangular space extending from the be ik along the 

 centre to the front, and a similar flat space on each side slop- 

 ing to the lateral margins, and thus each valve is composed, as 

 it were, of three plane surfaces. In the small specimens these 

 planes are not so distinctly indicated as they are in the large ones. 

 The surface is marked with fine concentric lines, and also with 

 longitudinal radiating stria?, the latter being scarcely visible ex- 

 cept when the shell is partly exfoliated. Length of large speci- 

 mens, thirteen lines, width about half the length. 



This species is closely allied to L. parallela, (Phillips)* but 

 has not, so far as we can judge from the inspection of a single 

 figure, so obtuse a beak. The size and proportions are the same 

 as those of L. ovata, (Mr. Coy)|- but in that species the longitu- 

 dinal radiating striae curve outwards, so as to cut the lateral mar- 

 gins nearly at right angles, while in this they are straight, and 

 thus, form acute angles with the edges of the shell. 



This species is dedicated to the distinguished geologist and 

 philosopher, Sir Charles Lyell. 



Locality and formation. — Alumette Island, Calciferous Sand- 

 rock. 



Collectoi. — Sir W. E. Logan. 



* Memoirs of the Geological Survey G. B., vol. 2, part 1, page 370, 

 pi. 26, fig. 1. 



fMr. Coy. British Palaeozoic Fossils, page 255, pi. 1 L, fig. 6. L. 

 ovata appears to be a Lower, and L. parallela an Upper Silurian speciea. 



