14 PROF. T. E. JONES ON SOME PALiEOZOIC OSTRACODA 



Tiot reaching the dorsal line, and very variable in expression, as 

 indicated in the figures. In some instances the valves are more 

 oblong than in KI. Wilckensiana, but in others they are much less 

 so, the posterior moiety being contracted below, with a strong 

 postero-ventral slope, giving rise to Prof. Hall's variety ventricosa. 

 Here also the middle lobe is variable in development. Prof. Hall 

 notes that the surface is delicately granulose (p. 379) in this species. 



It is represented by Kl. j^ennsylvanica in Dr. E. W. Claypole's 

 collection. 



Kl. notata and its variety are abundant in the Tentaculite-lime- 

 stone (Lower Helderberg), Herkimer Co., N.T. (Hall, I. c). 



They abound also in a limestone of the Waterlime Group from 

 near tltica, N. Y. State (British Museum). Beyrichia Ballii ac- 

 companies them. 



1*. Klcedenia notata (Hall), var. ventricosa, Hall. (PI. I. figs. 1 «, 

 1 h [after the original drawings] ; PI. lY. fig. 24.) 



Beyrichia notata, var. ventricosa, Hall, ' Palaeont. N. Y.' vol. iii. 

 p. 380 (pi. Ixxix. B, figs. 4 a-c ; not published). 



, PI. I. fi?. 

 Size 



' PI. lY. 





Length. 



Height. 





mm. 



mm. ' 



la.,.. 



. . . . 2-5 



1-2 



Ih.... 



. . . . 2-7 



1-2 



24 ... . 



. . . . 1-8 



1-03 



This variety is noticed above, under Kl. iiotota. 



Tentaculite-limestone from Coeymans, Albany Co., N.Y., collected 

 and given by Mr. J. M. Clarke, of Albany, N.Y., consists of thin 

 slabs of compact grey limestone showing on the bed-planes Polyzoa, 

 small Brachiopods, numerous Tentaculites, and small obscure 

 Ostracods, such as Primitia minuta (?), a larger oblong form, and 

 many small Kloedenice notatce. Among them are some much larger 

 individuals of this last species, attaining a length of more than 3 

 and of even 4 mm. 



Mr. Clarke has also favoured me with some Palaeozoic Ostracoda, 

 mostly of new species, (1) from the decomposed chert of the Corn- 

 iferous Limestone of Ontario Co., N.Y., and (2) from the Hamilton 

 Group in Clarke Co., Indiana. 



I'From no. ] . Primitia near P. fdbulina, J. & H. ; EurycJiilina 

 reticulata, Llrich (? a frilled Primitia near "-Beyrichia reticulata" 

 Bornemann) ; Beyrichice^ Strepula, and Moorea. — December 16, 

 1889.] 



YIII. Genus Beyrichia, M'Coy, 1846. 



1. Beyrichia trisulcata. Hall. (PI. I. fig. 2, after the original 

 drawing.) 



Beyrichia trisulcata. Hall, * Palaeont. N. Y.' vol. iii. 1859, p. 381 

 (pi. Ixxix. B, figs. 5 a, b; not published). 



Size : len^h 1-3 mm., height -75 mm. 



