538 PKOP. T. R. JONES ON SOME DEVONIAN AND 



squareness of form, however, being only one third longer than high, 

 whereas B. devonica is twice as long as it is high, is a character- 

 istic distinction. Therefore I propose to give it a separate name — 



B. SUBQUADEATA. 



In the decomposed Chert of the Corniferous Limestone, Ontario 

 Co., N. Y. Coll. Mr. J. M. Clarke. 



4. Beykichj A Klgedeni, M'Coy, variety. (PI. XXI. figs. 1 a, 1 h.) 



Length 5-7 mm. ; height 3 mm. ; breadth (through the middle lobe) 

 3 mm. 



This is evidently a smooth B. Kloedeni, of the var. dausa type, 

 with a pimpled hypertrophied anterior lobe. The correctness of 

 this determination may be seen by reference to the April Xo. of the 

 'Ann. & Mag. Xat. Hist.' 1886, pp. 354-356, pi. xii. figs. 9 & 13, 

 where specimens having one or the other of the characters here 

 present are treated of; and the perfectly smooth variety is men- 

 tioned, op. cit. p. 351, as var. nuda. 



So true a varietal form of B. Kloedeni in the Devonian Forma- 

 tion is of great interest, as an instance of persistency of species. 



The specimen figured is from the Corniferous Chert of Ontario 

 Co., Xew York. Coll. Mr. J. M. Clarke. 



5. Beyeichia Kolmodini, sp. nov. (PL XX. fig. 6.) 



Length 1*7 mm. ; height 1 mm. 



This has evidently a structure analogous to that of the Scandina- 

 vian BeyricJiia clavata, Kolmodin, especially of that variety figured 

 in the ' Ann. & Mag. Xat. Hist.' ser. 6, vol. i. p. 399, pi. xxi. fig. 8, 

 in which the upper part of the anterior lobe is crossed by a sulcus. 

 In the specimen before us the front of the valve is more acute 

 (narrower) than in B. davata, and the hinder portion rounder and 

 fuller, with a bold curvature. The three lobes run together at their 

 base, but more equally than in the fig. 8 referred to, the front and 

 hind lobes making one nearly uniform, curved, sausage-like, pimpled 

 swelling, from the inner curve of which the small, smooth, pyri- 

 form, middle lobe divides off with a narrow neck. The separated 

 portion of the anterior lobe is bold and round, and much larger 

 than in the variety of B. davata above-mentioned. The free margin, 

 though very distinct, is not radiated. 



It is from the Hamilton Group, of Clarke Co., Indiana, U.S.A. 

 Collected by Mr. J. M. Clarke, of Albany, N. Y. 



The species is worth naming after the Swedish palaeontologist 

 Dr. Lars Kolmodin, of Wisby, who has given good drawings and 

 descriptions of Scandinavian Ostraeoda. 



III. EuEYCHiLiNA, Ulrich, 1889. 



Geol. and Xat.-Hist. Survey of Canada : Contributions to the Micro- 

 palaeontology of the Cambro-Silurian Eocks of Canada, Part II., 

 by E. 0. Ulrich, 8vo, 1889, p. 52. 



This is a proposed genus, characterized by a thickened marginal 



