76 NEW YORK STATE MUSEUM 



EURYCHILINA Ulrich 



Enrychilina reticulata Ulrich. Contrib. Can. micro-pal. 1889. 



pt 2, p. 52 



PL 5, fig. 3 

 In the reddish gray limestone several specimens of a very 

 pretty ostracode were found, which, by their reticulate surface, 

 shape and extent of the sulcus and the structure of the marginal 

 area, prove their identity with Ulrich's Eurychilina reti- 

 culata. In view of the equality of their important characters, 

 no value can be attributed to certain small differences, as the 

 smaller size of the pits. Eurychilina reticulata has 

 been found heretofore only in the Lowville and Black river lime- 

 stones of the west. (Group 6) 



Eurychilina bulbifera sp. nov. 

 PI. 5, fig. 14-17 



Diagnosis. Carapace nearly semicircular, rather high, with 

 straight cardinal margin, strongly rounded anterior and posterior 

 margins, and less curved ventral margin. Sulcus about one third 

 of the length of the valve from the posterior end, deep, extending 

 one half the width of the convex part of the carapace. Posterior 

 part distinctly bulbous, higher than the rest of the shell. 

 Anterior and middle part strongly convex, highest ventrally of 

 center. Broad marginal area, with widely separate but very high 

 radial folds, exteriorly concave, abruptly upturned at the margin, 

 where a vertical outer closing wall is observable. Surface finely 

 granulo'se, with the exception of the marginal area, but the 

 vertical closing wall is distinctly granulose. 



Dimensions. Length of larger specimen 1.4 mm, hight .9 mm, 

 thickness .4 mm. 



Horizon and locality. In the compact reddish gray and gray 

 crystalline limestone pebbles of the Rysedorph hill conglomerate. 

 (Groups 6 and 7) 



Observations. This form may be easily distinguished from other 

 members of the genus by its short, convex form, large, strongly 



