NO. 9 NEW ARCTIC FORAMINIFERA CUSHMAN 7 



entire ventral surface, the outer edge of which extends often slightly 

 beyond the periphery, giving a serrate edge to the test even when 

 viewed from the dorsal side ; aperture a low opening between the um- 

 bilicus and the periphery at the ventral edge of the last-formed 

 chamber. Diameter, up to nearly 2.00 mm. 



Holotype. — U.S.N.M. No. 26145, from 34-37 fathoms, SE. corner 

 of Fox Basin, latitude 66°46' N., longitude 69° 15' W. 



This is a very finely ornamented species, and has occurred in great 

 abundance in the Fox Basin material, but did not occur in any of the 

 collections from off the NE. coast of Greenland. The ventral side 

 becomes very ornate even in the youngest specimens. Nearly all of our 

 specimens are megalospheric and the proloculum becomes of very large 

 size in comparison to the size of the test. The species is named after 

 Capt. Robert A. Bartlett, collector of this material. It occurs at the 

 following stations in the Fox Basin: 25-31 fathoms. Fox Basin; Fox 

 Basin, latitude 66°43' N., longitude 80°/' W. ; and 25 fathoms, center 

 of Fox Basin. 



CASSIDULINA NORCROSSI, n. sp. 



Plate 2, figs. 7a-c 



Test biconvex, periphery subacute or even slightly keeled ; chambers 

 distinct, generally triangular in side view, those of each set reaching 

 nearly to the umbilicus on both sides ; wall smooth, very finely per- 

 forate, clear and almost transparent ; aperture elongate, in general 

 in the line of coiling. Diameter, 0.40-0.45 mm; thickness, 0.15- 

 0.18 mm. 



Holotype. — U.S.N.M. No. 26139, from 7 fathoms, 5 miles oft' Cape 

 Borlase Warren, NE. Greenland. 



This very distinctive species is named for Arthur D. Norcross, of 

 New York City, whose close association and friendly cooperation with 

 Captain Bartlett have enabled him to accomplish so much in the way 

 of Arctic exploration in recent years. It occurs only off the NE. 

 coast of Greenland at but a few stations as follows : 50-57 fathoms, off 

 Clavering Island, NE. Greenland ; 7 fathoms, off Cape Stosch, Gott- 

 haab Island, Hudson Land, NE. Greenland ; and between Shannon 

 Island and Hochstetter Foreland, NE. Greenland. The chambers at 

 first do not appear to have the usual alternating arrangement, owing 

 to the fact that each one comes nearly to the umbilicus on each side, 

 and the difference in size between the two pairs on the same side is 

 not nearly so well marked as is usual in most species. 



