170 NEW YORK STATE MUSEUM 



Cretaceous chalk which appears to be its earhest occurrence pre- 

 viously reported. The specimen we are describing measures 0.13 mm 

 in diameter. 



Genus NODOSARIA (Lamarck) 



The genus Nodosaria is well represented in the Bonaventure 

 cherts, but most of the forms belong to one species, Nodosaria 

 radicula (Linne) . This type is apparently the only form in any 

 of our slides which is perfect, typical and unusually small. It is 

 one of the earliest genera, occurs in Cambrian strata and becomes 

 remarkably well developed in the Carboniferous period. 



It is easily recognized. The only mistake possible is when a Testu- 

 larian is cut on edge away from a median line, in which case it might 

 be taken for a uniserial form. Some of our specimens even show 

 the apertural opening from chamber to chamber as in existing 

 types, and the whole specimens are remarkably and perfectly pre- 

 served. They are, however, all short forms, even when stoutly 

 constructed; and have few chambers, some with but two or three 

 and often only four. Several species of , this genus occur, but none 

 so frequently as the straight-shelled N. radicula which is 

 shown in many sections. 



Nodosaria (D.) communis (d'Orbigny) 



Plate 3, figures 14, 15 



Dentalina communis d'Orbigny, 1826, Annales des Sci. Nat., 



7:254, no. 35 

 Dentalina badenensis d'Orbigny, 1846, Foram. foss. Vienne, 



p. 44, pi. i, figs. 48, 49 

 Nodosaria communis Bagg, 1912, U. S. Geol. Survey, Bui. 513, 



p. 54, pi. xvi, figs. 5, 8, 9 

 Dentalina inornata Reuss 1863, Sitzungsb. d. k. Akad. Wiss. Wien, 



48:45, pi. ii, fig. 18 



Four segments occur on slide i showing very characteristic 

 features of Nodosaria communis, but belonging to the 

 obliquely-set chamber variety approaching true Vaginulina types. 

 The anterior margin, however, curves back as in the Dentalina 

 forms, and the sutures along the border are slightly depressed, 

 exactly as in Dentalina badenensis d'Orbigny, which this 

 form so closely resembles. The primordial chambers are not 

 visible, but from the four preserved it is evident that the shell 

 consisted of about five, or possibly six, segments rapidly extending 

 but with very arcuate septae. 



The Carboniferous types figured by Brady (Pal. Soc, 30:127, 

 pi. X, figs. 17, 18) show too many segments for the form we find. 



