TROM NORTH AMERICA., WALES, AND IRELAND. 15 



Fig. 2 looks like a small Kloedenla with three short and nearly- 

 equal sulci dividing the dorsal region into four almost equal lobes. 

 Kl. plicata has even four furrows, but the subcentral prominent 

 lobe is always distinct in this genus, and I would rather regard the 

 form under notice as a Beyrichia, because if the three sulci were 

 more distinct, more unequal, and reached to the ventral region, the 

 valve would approximate to that of Beyrichia digitata, Krause, 

 Zeitschr. d. D. g. Ges. 1889, p. 20, pi. ii. fig. 12. 



The lobe at one end is the smallest of the series. The surface is 

 stated to be iiuely granulose. 



From the Lower-Hclderberg group, State of New York. 



2. Eeyrtchia Hallit, sp. nov. (PL IV. fig. 21.) 



Size: length 1-3 mm., height '76 mm. 



A trisulcate Beyrichian form, but not B. trisulcata, Hall. The 

 three furrows are broad and shallow, reaching a little more than 

 two thirds across the valve. The two sulci near the ends are 

 curved nearly parallel to their respective margins, but at some 

 distance from them ; the middle sulcus has an elongate oval outline. 

 The lobes or ridges are moderately convex, and vary, but not 

 very much, in size. Two lobes in the middle form a curved, nearly 

 semicircular ridge, not free in the ventral region, as is the horse- 

 shoe ridge in Bollia, but coalescing with the two end lobes along 

 that region ; and the surface of the valve slopes smoothly and gently 

 down to the margin, all along the free border. 



The valve is suboblong ; straight on the back, with a cardinal 

 angle at the posterior end, and rounded off anteriorly. Ends un- 

 equally rounded ; ventral margin slightly incurved. 



British Museum. Rare, in a piece of limestone of the "Waterlime 

 Group, from near Utica, N.-Y. State. This limestone is compact and 

 dark-grey, weathering brownish-grey. Largely composed of small 

 organisms, especially Kloedenia notata, with small Brachiopods, &c. 



3. Beyrichia granulata, Hall. (PL I. fig. 3, after the original 



drawing.) 



Beyrichia granulata^ Hall, ' Palaeont. IS". Y.' vol. iii. 1859, p. 377 

 (pL Ixxix. B, figs, lad ; not published). 



Size : length 3*5 mm., height 2-0 mm. 



Fig. 3 represents a Beyrichia much like B. Kloedeni^ var. tuher- 

 culata *, Salter, but its dorsal line is straight, and its free border 

 is thickened with a broad marginal rim. Of the three the posterior 

 lobe is the largest, and it unites with the front lobe below the 

 well-marked, oval, middle lobe. 



From the Pentamerus-limestone of the Lower-Helderberg Group, 

 Schoharie Co., N.Y. 



* Geol. Mag. 1881, p. 345, pL x. fig. 13; Ann. & Mag. Nat. Hist., ser. 5, 

 vol. xvii. 1886, p. 354, pi. xii. fig. 8. 



