I 



68 



The shell, which is supposed to be the ventral valve of this species, is 

 gently convex, with usually a somewhat flat space extending from the 

 front margin upwards towards the beak. The apical angle appears to be 

 from 90 to 100 degrees. Shell very thick, of a lamellar structure, dark 

 brown or nearly black, and, sometimes, where exfoliated, of an ashy gre 

 colour. Surface with a number of obscure undulations of growth and 

 with fine longitudinal strii^, about ten in the width of one line. 



Cruziana similis. (N. sp.) 



Fig. 37. Ci uziana similU ; y, the median groove ; r, r, the ridges at the sides. 



Bescrij^ition. — The specimens are from twelve to fifteen lines wide, 

 divided along the middle by an angular groove, and bordered on each 

 side by a narrow ridge, abuut one line wide. The spaces on each side 

 between the median groove and the marginal ridges are moderately con- 

 vex and crossed obliquely by numerous irregular raised lines, with furrows 

 between them. These lines usually have the form of a gentle sigmoid 

 curve, sometimes extending quite across, but are often crowded together 

 in a somewhat confused manner, still preserving the general oblique 

 direction. Upon an average there are about ten lines in the length of 

 half an inch. The marginal ridges are sometimes longitudinally striated. 



This species has been heretofore referred by me to C. semiplicaki, 

 Salter, but, although closely allied, none of our specimens agree exactly 

 with the figures of the British species. 



Besides the above six species, many of the beds of sandstone of Great 

 Bell Island are covered with several species Of FalcBOi)hycus and other 

 forms allied to Eophyton and Crimana- To describe these would require 

 further collections. In the upper strata there are yet two or three new 

 species of Lingida^ of which we have only fragments. 



