l86 NEW YORK STATE MUSEUM 



In existing oceans Truncatulina ungerianais reported 

 from the Arctic and North Atlantic waters and has a wide bathy- 

 metric range. As a fossil it is better known from the Tertiary 

 but has been reported from the Trias and Cretaceous horizons of 

 the Mesozoic. 



The original figure of d'Orbigny shows eleven segments in the 

 ultimate whorl, but many published illustrations of this type among 

 the older geologic formations show but nine or, as in our California 

 Pliocene, but eight. The test is well widened at the border and 

 slightly depressed at the sutures, this feature becoming more pro- 

 nounced toward the ultimate segment. There are sixteen chambers 

 in one chert section (slide 3) and these are moderately arched with 

 wide septa, curved and somewhat thickened at the periphery. 

 When viewed on edge this species should show an almost plano-convex 

 form with sharp periphery, as in Truncatulina wueller- 

 s t o r f i (Schwager) . Such a form occurs on slide 6 and is placed 

 here. We are impressed with the rotaline form of this foraminiferan 

 when seen in cross section; but there are no divided septal walls as 

 in the higher type, and we believe we are right in ascribing the speci- 

 men to this species, although Truncatulina akneriana 

 (d'Orbigny) would give a very closely related appearance in cross 

 view. Another specimen, probably belonging here, is found on slide 

 5 (X) showing twenty segments; its diameter is only o.io mm. 



Qenus ANOMALINA d'Orbigny 



The genus Anomalina belongs to the planorbuline form.s of the 

 rotaline group, and it is somewhat doubtful whether the genus 

 should be retained. It has been extensively used, and the type is 

 so well established, however, that we may continue this for rotaline 

 forms of Truncatulina which are complanate and show on both 

 surfaces the entire segmentation. It is in this respect similar to 

 Nonionina or Polystomella, and, like these, possesses a high organi- 

 zation. 



In the form we identify the septal walls show slight canal systems, 

 or at least they are double as in the higher rotaline genera. We 

 find but one example which seems to belong to this genus, ■ and 

 it is unusually large for the type and not cut in such a manner that 

 its entire segmentation can be determined. It is rotaline, has 

 double septa in the walls and is plano-convex ; so that it would seem 

 to be Anomalina although the genus has never been observed, so 

 far as we are aware, in strata of Paleozoic age. It is best known 

 as a Cretaceous fossil. 



