130 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



There has been much discussion as to whether this is really a fo- 

 raminifer or not. It has many of the characters of the group and the 

 main objection to placing it here is on account of its size. A single 

 small specimen in the National Museum figured here shows something 



Fig. 203.— Neusina agassizii. a, complete specimen, X 1J. b, early portion of same specimen 



FROM OPPOSITE SIDE, X 5. 



of the early development. Evidently from this specimen there is a 

 close coiled young, then an arcuate uncoiled growth, and finally the 

 broad, flaring growth characteristic of the adult is taken on. The 

 specimen was associated with Rhizammina algxformis H. B. Brady. 



