FORAMINIFERA OF THE ATLAISTTIC OCEAN. 



55 



This seems to be easily (listii]o;uislie(l from typical C. cancellata, as 

 its shape, periphery, umbiHcatc region, with exposed previous coils, 

 are very distinct from that species. Its nearest related sj>ecies is 

 the much smaller C. puftUh i)iit that is very much snialler. 



Cyclfunviinti compressa — mutcrinl examined. 



Cat. 



No. 



Coll. of- 



No. of 

 speci- 

 mens. 



Station. 



Loc-alitv. 



Depth 



in 

 fath- 

 oms. 



Bot- 

 tom 

 tem- 

 pera- 

 ture. 



Character of 

 bottom. 



.Vbundance. 



CYCLAMMINA PAUCILOCULATA Cushman. 



Plate 11, fiff. 2. 



CifcldDuuini pauciloculata Ccsh.vian, Proc. U. S. Nat. Mus., Aol. 51, 1917, p. 653. 



Descnption. — Test compressed, nautiloid, biconvex, peripheral 

 margin bluntly rounded, umbilical region depressed, chambers typi- 

 cally ton to eleven in the last-formed coil, sutures nearly straight to 

 somoAvhat curved; surface smooth A\-hen perfect; supplementary 

 apertural pores feAV in number. 



Diameter, up to 2.5 mm. 



Distribution. — This species is Avidely distributed. Originall}' de- 

 scribed from the Philippine region where it is Avidely distril)uted, 

 especially in the deeper cooler Avaters it has been found in consid- 

 erable numbers in the Avestern Atlantic. Specimens are numerous 

 from the northeastern coast of the United States, from the Gulf of 

 Mexico, and less common from the Caribbean Sea. 



This species holds a somcAA-hat intermediate positibn betAA'eeu C. 

 cancellata and C. compressa and is easily distinguished from either by 

 the smaller size and smaller number of chambers in the last-formed 

 coil at any stage of deA'elo})ment. 



