FEOM NORTH AMEEICA, WALES, AND IRELAND. 17 



The specimen is from the Tentaculite-limestone of Herkimer Co., 

 N.Y. It is about 1'15 mm. in length, and belongs to the B. 

 Kloedeni-dausa group, passing almost into Kloedenia, by the full 

 ventral coalescence of the fore and aft lobes and the feeble develop- 

 ment of the anterior sulcus. 



Fig. 1. — Bej/ricMa parasitica (Hall). 

 (Magnified 20 diameters.) 



X20 



This drawing (fig. 1) is remarkably similar to the specimen from 

 New Brunswick, described and figured in the Ann. & Mag. ISTat. 

 Hist. ser. 6, vol. iii. 1889, p. 381, pi. xvii. fig. 7 a, as being probably 

 the same as Beyrichia arcnata (Bean). 



Pig. 2. — Beyrichia Clarkei, sp. nov. 

 (Magnified 20 diameters.) 



X20 



7. Beyrichia Clarkei, sp. nov. (Woodcut, fig. 2.) 



Size : length 1*45 mm., height '9 mm. 



Mr. Clarke has also courteously supplied me with a drawing of a 

 small Ostracod (fig. 2) which is associated with Beyrichia oculina 

 and B. notata-ventricosa in the Lower-Helderberg Group of Herkimer 

 Co., KY. 



Subquadrate and deeply sulcate, this appears to be intermediate to 

 Bollia lata (PI. III. fig. 3) and Beyrichia Hallii (PI. IV. fig. 21), 

 see above, pages 12 and 15. The middle or horse-shoe ridge not 

 being free below, and the two lateral sulci not quite reaching the 

 ventral margin, place it nearer to the quadrijugate B. Hallii than 

 to Bollia. In this we can see a passage-form between the two 

 genera. 



I propose to distinguish this interesting form as Beyrichia Clarl-ei, 

 naming it after my obliging friend, Mr. J. M. Clarke, Prof. Hall's 

 accomplished palaDontological assistant in the Slate Museum at 

 Albany, N.Y. 



Q. J. G. S. No. 181. 



