FORAMINIFEEA OF THE ATLANTIC OCEAN". 51 



Genus CRIBROSTOMOIDES Cushman, 1910. 



Haplophragmium IT. B. 1?rai)Y (part), Rep. Voy. Challenger. Zoolosv, vol. 9, 



1884, p. 307. 

 Cribrostomoidcs Cushman, Bull. 71, V. S. Nat. Mus., pt. 1 I^'IO, p. 108, fig. 



167a, b. (Type, Cribrostomoidcs bradiji Cushman). 



DescHption. — Test free, planospiral, coiujiosed of numerous cliaiu- 

 bers ill several coils, the last-formed coil with several chambers 

 proo;ressively increasing in size, wall arenaceous, with nuich cement 

 usually of a light brown color, a] erture in young s):ecimoiis a sim])lo 

 elongate slit at the base of the apertural face, later subdivided by 

 tooth-like processes, and in the n(hilt represented by a linear series 

 of distinct rounded o}K>nings. 



This genus, while in general character is similar to HaplopJtrag- 

 moides, differs very distinctly in tlie apertural characters and in 

 their development. 



CRIBROSTOMOroES BRADYI Cushman. 



Plate 10, fig. 3. 



Haplophraf/mium Intidorsatum. H. B. Brady (part) (not Bornemamr). Rep. Voy. 



Challenger, Zoology, vol. 9. 1884, p. 307. pi. 34.%. 9.— Goes. Bull. -Mu.^'.Comp. 



Zcol., vol. 29, 1890, p. 29 (part). 

 Cribrostomoides bradyi Cushmax, Bull. 71, U. S. Nat. Mus.. pt. ], 1910. p. 108, 



figs. 167«. 6.— Pearcey, Trans. Roy. Soc. Edinburgh, vol. 49. 1914, p. 1009. 



Description. — Test large, planospiral, or the last-formed coil 

 slightly oblique: periphery broadly rounded, very slightly if at all 

 lobulated, usually completely involute, umbilicate, chambers numer- 

 ous, seven to nine in the last-formed coil, low and broad, sutures 

 distinct; wall arenaceous, Siiioothly finished, aperture in the 

 young a simple slit at the base of the chamber, in later stages becom- 

 ing interrupted by ingrowing, tooth-like ]>rojections whicli later 

 meet and form a linear series of rounded o]^enings in the adult; 

 color grayish or yellowish brown. 



Diameter, up to 3 mm. 



Distribution. — As this genus and species ^^■as not segregated until 

 1910, its distribution largely depends upon records from that time. 

 It has been recorded from the. Pacific in A'arious areas (Cushman) 

 and from the South Atlantic and Antarctic (Pearcey). In the 

 Albatross material it occurs off the northeastern United States at 

 many stations in cold water and at a few in the Gulf of Mexico and 

 Caribbean. Srecimcns were noted in one lot of Gohlseel'er material 

 from off the British Isles. Adult specimens are easily distinguished, 

 and younger specimens have the peculiar aperture and smooth exterior. 



