Eleven New Genera of Foraminifera 



By Alfred R. Loeblich, Jr., and Helen Tappan ^ 



Introduction 



WITH THE INCRKA8ED NUMBER of aids foF ideutifica- 

 tion of genera now in common use, such as X-ray 

 and petrographic methods of determming wall struc- 

 ture and composition, thin-sectioning or dissections to 

 show internal structures, and higher magnifications to 

 study apertiu-al characters, etc., a more refined classi- 

 fication is often possible, and species are occasionally 

 found which do not fit into previously described genera 

 without greatly expanding the generic limits. As too 

 wide generic limits lessen their usefulness in strati- 

 graphic work, and also may transgress natural relation- 

 ships, it seems advisable to propose new generic names 

 for these dissimilar species. 



During a restudy of type species of foraminifera! 

 genera, undertaken by the writers in connection with 

 the preparation of the "Treatise on Invertebrate 

 Paleontology," there were found a number of such 

 species which did not fit well into any previously de- 

 scribed genera. Some of these species had been de- 

 scribed in the past and referred to other genera to 

 which they can no longer be assigned. Seven new 

 species are also described. Eleven new generic names 

 are proposed and defined, and one previously described 

 genus is emended on the basis of unsuspected charac- 

 ters discovered in the type species. The Foraminifera 

 discussed in the present paper are of varying ages and 

 localities, six being found in Recent dredgings, one from 

 the Pleistocene, two from the Tertiary, five from the 

 Cretaceous, and one from the Jurassic; and the species 



' Helen Tappan Loeblich, U. S. Qeological Survey and Research Associate, Smith- 

 sonian Institution. 



cover a geographic range from Europe to North 

 America, and from the North Atlantic to the South 

 Pacific. 



The writers are grateful to the Smithsonian Institu- 

 tion for making it possible for Alfred R. Loeblich to 

 visit the British Museum (Natural History) in London 

 and to make collections in the field in England, France, 

 and Spain; and to the John Simon Guggenheim Me- 

 morial Foundation for a fellowship grant to Helen 

 Tappan Loeblich, which made possible the restudy and 

 reillustration of the Jones, Parker and Brady, and the 

 Barnard types iu the British Museum. 



Assistance in the field, in the collection of material 

 used in the present paper, was graciously given by Mr. 

 A. G. Davis, British Museum (Natural History), Lon- 

 don, Mr. Raymond Casey, Geological Survey of Great 

 Britain, London, Dr. J. R. Bataller, University of 

 Barcelona, Spain, and M. Pierre Marie, Bureau des 

 Recherches G^ologiques et G^ophysiques, Paris, France. 



Dr. H. W. Parker, British Museum (Natural His- 

 tory), London, also aided the present study by allow- 

 ing access to the types of Foraminifera under his care, 

 and making possible the reillustration of the type 

 specimens of Hemisphaerammina bradyi, Tentifrons 

 barnardi, and Webbinella hemisphaerica. He also made 

 possible the exchange of material, allowing us to ob- 

 tain topotype specimens of Favocassidulina favus. 



All specimens studied in the present paper are de- 

 posited either in the U. S. National Museum, Wash- 

 ington, D. C. (hereafter abbreviated as USNM), or in 

 the British Museum (Natural History), London, Eng- 

 land (hereafter abbreviated as BMNH). 



Systematic Descriptions 



Family Saccanxminidae Brady, 1884 

 Hemisphaerammina Loeblich and Tappan, new genus 



Type species: HemisphaerammiTia batalleri, new 

 species. (Derivation: hemi, Gr., h&\i-\-sphaira, Gr., 

 ball+ommos, Gr., sand; gender feminine.) 



Test attached, consisting of a single hemispherical 

 chamber; wall agglutinated, with considerable cement; 

 aperture not observed. 



Remarks: Upon examination of the British Mu- 

 seum (Natural History) collections in London, the 



holotype of Webbiiia hemispherica Parker, Jones and 

 Brady (type species of Webbinella Rhumbler) was 

 found to be an attached polymorphinid, and the generic 

 description has therefore been emended. This left 

 nameless the attached hemispherical agglutinated forms 

 previously placed in Webbinella and the present genus 

 is described to fill that vacancy. 



It differs from Webbinelloidea Stewart and Lampe, 

 1947, in consisting only of single chambers, whereas 

 the type species of Webbinelloidea is two chambered, 

 and other species have three or four chambers. Two 

 species of Webbinelloidea have been described as single- 



