NO. 1 CUSHMAN, MCCULLOCH : ARENACEOUS FORAMINIFERA 113 



shape ; sutures slightly depressed ; wall composed of sand grains, some 

 rather coarse but with much cement and the surface fairly smooth; 

 aperture at or above the base in the outer wall of the last-formed 

 chamber. Length up to 3.00 mm. 



Holotype ( AH F no. 21) from locality 2024. 



There are several specimens from the type locality attached to shell 

 fragments. These seem in every way identical with the specimens fig- 

 ured by Brady in the Challenger Report. There are numerous Recent 

 records for this species but most of them are unaccompanied by figures. 

 The Recent species is not the same as the Cretaceous one described by 

 d'Orbigny. It occurs also at localities 2034, 2065, 2017, 2009, 2044, 

 2070, 2057. 



In our material there are a very few specimens attached to echinoid 

 spines or to sponge spicules, one of which is figured. These are very 

 slender, perhaps due to the small amount of surface and may represent 

 another species. Material was not in sufficient quantity to be certain of 

 this. 



The slender forms are from localities 2005, 1046. 



Distribution. — Type locality, ofif Ildefonso Island, Mexico, in 55 

 fms. The range continues as far as Consag Rock in the Gulf of Cali- 

 fornia; off Lower California, Mexico, on the ocean side northward to 

 San Miguel, in 120 fms. for the slender form of this species. 



