FORAMINIFERA OF THE GENERA SIPHOGENERINA 

 AND PAVONINA 



By Joseph A. Cusiiman 



Of Sharon, Massachusetts 



Continued study of various collections of Foraminifera, largely 

 brought together through governmental agencies, has rendered it 

 both possible and advisable to present at this time a revision of two 

 genera of Foraminifera and their component species, the Genus 

 Siphogenerina Schlumberger, and Pavonina d'Orbigny. 



GENUS SIPHOGENERINA SCHLUMBERGER 



There seems to be some hestitation on the part of certain workers 

 on the Foraminifera to make use of the generic name Siphogenerina. 

 Instead of using it the generic name Sagrina is often used. A study 

 of West Indian material has made possible the clearing up of the 

 questions relating to these two generic names. A review of much 

 of the literature, and of species so far as specimens are available, 

 has given some very definite information as to distribution. 



The type species of d'Orbigny's genus Sagrina is S. pulchella 

 d'Orbigny.* The description and figure are very definite. The 

 generic description freely translated is as follows : ' ' Test free, regular, 

 equilateral, conical, chambers globular, regularly alternating at aU 

 stages on each side of the longitudinal axis, partially overlapping; 

 aperture rounded, above the last-formed chamber at the end of an 

 elongate neck." The similarity to Textularia is also noted. The 

 other species from the Chalk of the Paris Basin, S. rugosa d'Orbigny,^ 

 is of similar character. 



Little further note is made of Sagrina until in 1865 Parker and 

 Jones ^ emended it, and used it in a subgeneric sense under TJvigerina 

 to include diaphanus, dimorpha, and nodosa. Their work was fol- 

 lowed by subsequent authors. The type of d'Orbigny is referred to 

 as follows (p. 364): "D'Orbigny has figured under the name of 

 Sagrina pulchella (Foram. Cuba, pi. 1, figs. 23, 24) a specimen which 

 was either the young, or an arrested individual of such a biformed 

 TJvigerina,''^ and also: "Not only is our Nodosariform TJvigerina 



1 De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, "Foraminiferes," p. 150, pi. 1, figs. 23, 24. 

 2M#m. Soc. geol. France, vol. 4, 1840, p. 47, pi. 4, figs. 31, 32. 

 sPhilos. Trans., vol. 155, p. 363. 



No. 2597.— Proceedings U. S. National Museum vol. 67, art. 25. 



53650— 26t 1 1 



