FORAMINIFERA OF THE ATLANTIC OCEAN. 



61 



chambers, in ndult s]-)ocim(>iis mnkiiifi: uj) t]i(> larfjor portion of the 

 test; wall rather coarseh^ arenaceous, somewhat variable in its sur- 

 face, usually roughened, but oeeasionally faiih" smooth; aperture 

 in the eaily uncoiled portion slit-like, at the base of the apertural 

 face, in the uncoiled portion the aperture is in the middle of the 

 t,erminal face and is rounded; color variable, usually gray. 



Diameter of coilecl poition about 1 mm. ; total length up to 3 mm. 



Distrihufion-. — This is a very widely distributed species, but has 

 lieen used to include more than one species. Some of these are noted 

 liere, but older records as a rule need cliecking from the original 

 specimens. In tlie AJhafross material it is very common at numerous 

 stations, in general between latitudes 37° and 40° N., and longitudes 

 66° and 74° W. Specimens were also obtained in the Gulf of Mexico 

 which are referred to this species, but they are not as typical as a 

 rule. It is best developed in fairly deep, cold water. 



In tlie rougher specimens the sutures dividing the chambers are 

 difficult to distinguish, but are more clearly shown in the smoother 

 forms. 'As the amount of cement is not dominant, the color largely 

 depends upon tlie material of which the test is composed. 



A mmobaculiles agglutinans — mntcriul exam ined. 



