BUFFALO SOCIETY OF NATURAI, SCIENCES 97 



left of this sinus. Length of shell: 25 mm.; width: 26 mm.; 

 height from beak to base: 5 mm. in specimen (restored height 

 about 7 mm.) 



This is the high coned form corresponding to Barrande's 

 Hercynella bohemica, though differing from it considerably. It is 

 much smaller than the majority of the Bohemian species, but it 

 conforms to the law observed among them, that, in the same 

 horizon the high coned forms have a more pronounced sinus than 

 the low coned ones, and this will be seen to be the case from a 

 comparison of the figures of H. buffaloensis and H. patellifoi mis . 



The asymmetry of the shell is more pronounced than in 

 H. patellifoi mis , the apex being situated about 4 mm. to the 

 right of a median line. This excentric position of the apex has 

 not, however, caused any elongation of the shell, for this has an 

 almost perfectly circular outline of base. The relative positions 

 of the apex and sinus are very different in the two species : in 

 H. buffaloensis the sinus is not on the line passing through the 

 greatest and least slope, but is ninety degrees removed at the shell 

 margin, while in H. patelliformis the sinus coincides with the 

 axis of greatest elongation. 



To the left of the radial sinus are a few striae so faint that 

 they are barely discernible under a high power lens, but of their 

 presence there can be no doubt, for wdiile continuous lines from 

 beak to base cannot be traced, the points of intersection of the 

 striae with the lines of growth can be seen, giving the same type 

 of ornamentation figured by Barrande for Hercynella nobilis 

 Barr., though not so well defined. 



Horizon and Locality . — In the Bertie Waterlime of North 

 Buffalo. Six specimens. Types in the Museum of the Buffalo 

 Society of Natural Sciences. 



Hercynella patelliformis sp. nov. 



Description: — Shell patelliform, elliptical, non-spiral. The 

 beak is destroyed, but its position as shown by the curvature is 

 asymmetric. Lines of growth show on peripheral portions of 

 the shell. In places there are faint concentric undulations, but 

 they cannot be traced completely around the shell. There are 

 no radiating striae. There is no sharp sinus or elevated fold or 

 ridge, but the growth lines bend in on the posterior margin 

 indicating the presence of a slight sinus. Length of shell: 

 61.7 mm.; width: 49.1 mm.; height from beak to base: 11.9 mm. 



