FORAMINIFERA OF THE ATLANTIC OCEAN. 



85 



In its typical form the species has occurred in the western Atlantic 

 at numerous stations from the latitude of Cape Cod southward along 

 the Atlantic coast as well as from the Gulf of Mexico and Caribbean 

 Sea. The following variety may be distinguished at least in some of 

 the collections. 



Clavulina communis — maUrial examined. 



CLAVULINA COMMUNIS d'Orbigny, var. NODULOS.\, new rariety. 



Plate 18, figs. 1-3. 



Clavulina communis H. B. Brady (part), Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, pi. 48, figs. 9-12.— Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 288, 

 pi. 34, fig. 3.— SiDEBOTTOM (part?), Journ. Roy. Micr. Soc, 1918, p. 25. 



Description. — Variety differing from the typical form of the species 

 in the longer form and especially in the shape of the chambers which 

 in the variety are more or less pyriform, being broadest near the 

 base of the chamber, giving a nodulose appearance to the uniserial 

 portion; aperture usually without the definite protuberant neck of 

 the typical form of the species. 



Length up to 7 mm. 



Distribution. — This variety is figured by Brady and Flint in the 

 references given above. Sidebottom in his paper on the foram- 

 inifera from the east coast of Australia mentions one of two forms 

 as "comparatively smooth, and the later chambers are fitted on to 

 each other in such a manner as to cause the lower edge of the 

 chambers to project slightly." This is evidently similar to the 

 present variety and it may be widely spread. 



Tlie best specimens of this variety I have had from four stations 

 off the eastern coast of the United States. The types are from 

 Albatross station D2547 in 390 fathoms (713 meters). 



