44 



ITNITED STATES NATIONAL MUSEtJM BXILLETIlSr 215 



Trinitella was considered to have slightly flattened 

 later chambers, tending toward Globotruncana, but this 

 is present only on the last one or two chambers. No 

 true keel as in Globotruncana is found in this group. 



As all three of these subgenera were from the same 

 horizon and all have the same type of surface ornamen- 

 tation and apertin-al characters, it seems probable that 

 these gradations are not accidental, and that only a 

 single genus is present, the differences found being only 

 sufficient to warrant specific separation. 



Later, Bronnimann and Brown (1956) described the 

 monotypic genus Kuglerina, the type species being one 

 originally considered by Bronnimann as a subspecies 

 of the type species of Rugoglobigerina, with which it is 

 associated. The original types were deposited in the 

 U. S. National Museum, and show the general chamber 

 shape and ornamentation characteristic of R. rugosa. 

 Bronnimann and Brown state that Kuglerina differs 

 from Rugoglobigerina in being higher spired and in hav- 

 ing a smaller and deeper mnbOicus, and ia completely 

 lacking umbilical cover plates. The height of the spire 

 and size and depth of the umbilicus are characters of 

 only specific or subspecific rank. Although the aper- 

 tural character is of greater importance, the apertural 

 region of the type specimens is completely obscured by 

 matrix, and the actual presence or absence of tegUla 

 cannot be determtaed. Because the species has never 

 been recorded from other localities, the characters can 

 only be those visible on the type specimens, and the 

 tegiUa are so fragile that they are only preserved in very 

 fine specimens. Therefore, the basis for separation of 

 this genus is extremely doubtful and we consider it a 

 synonym of Rugoglobigerina, the questionable assigna- 

 tion being due only to the poor preservation of the type 

 specimens. 



Types and occurkence: Holotype of Rugoglobi- 

 gerina rugosa (Plummer) in the Paleontological Re- 

 search Institute, Ithaca, New York. Unfigured topo- 

 types (USNM P3928, P3921) from the Navarro (Kemp 

 Clay), Maestrichtian, 10 feet below the contact with 

 the Midway (Paleocene), in the bank of Walker Creek, 

 6 miles N. 15° E. of Cameron, about 1 mile upstream 

 from the intersection of Walker Creek and the Cameron- 

 Clarkson road, Milan County, Texas. Figured hypo- 

 type (USNM P3929) from the Navarro (Corsicana 

 marl), branch of Mustang Creek, 1 mile WSW of Noack, 

 900 feet downstream from the road and 0.2 mUe south- 

 west of Christ Evangelical Lutheran Church, WiUiam- 

 son County, Texas. Collected by A. R. Loeblich, Jr., 

 1955. 



Holotype of Plummerella hantkeninoides hantkeni- 

 noides Bronnimann {=Plummerita, new name) (USNM 

 P4847) from the Maestrichtian, Guayaguayare beds, 

 Abathomphalus mayaroensis zone, Trinidad, B. W. I. 



Holotype (USNM P4856) of Trinitella scotti Bronni- 

 mann from the Maestrichtian, Guayaguayare beds, 

 Abathomphalus mayaroensis zone, Trinidad, B. W. I. 



Figured hypotype (USNM P4838) and unfigured 

 hypotypes (USNM P4823) of Trinitella scotti Bronni- 

 mann from the Maestrichtian, Navarro (Kemp clay), 



10 feet below the Midway (Paleocene) contact, in bank 

 of Walker Creek, 6 miles N. 15° E. of Cameron, about 

 1 mUe upstream from intersection of Walker Creek and 

 the Cameron-Clarkson road, MUam County, Texas. 



Holotype of Rugoglobigerina rugosa rotundata Bron- 

 nimann, the type species of Kuglerina Bronnimann and 

 Brown (USNM P5401) from the Maestrichtian Guaya- 

 guayare beds, Abathomphalus mayaroensis zone, Trini- 

 dad, B. W. I. 



Range: Turonian to Maestrichtian. 



Genus Globotruncana Cushman, 1927 



Plate 11, Figures 6-llc 



Globotruncana Cushman, Contr. Cushman Lab. Foram. Res., 



vol. 3, p. 91, 1927. 

 Rosalinella Marie, M^m. Mus. Hist. Nat. Paris, new ser., vol. 



12, p. 237, 1941. (Type species: Rosalina linneiana d'Or- 



bigny, 1839. Fixed by original designation.) 

 Bucherina Bronnimann and Brown, Eclog. Geol. Helvetiae, 



vol. 48 (1955), No. 2, p. 557, 1956. (Type species: Bucherina 



sandidgei Bronnimann and Brown, 1956. Fixed by original 



designation and monotypy.) 

 Rugotruncana Bronnimann and Brown, Ibid., p. 546, 1956. 



(Type species: Rugotruncana tilevi Bronnimann and Brown, 



1956. Fixed by original designation.) 

 Marginotruncana Hofker, Neues Jahrb. Geol. Palaontol., Abh., 



vol. 103, pt. 3, p. 319, 1956. (Tj^pe species: Rosalina 



marginata Reuss, 1845. Fixed by original designation.) 



Type species: Pvlvinulina area Cushman, 1926. 

 Fixed by original designation and monotypy. 



Test free, trochospiral, biconvex, spiroconvex or 

 umbilicoconvex, broadly umbilicate, periphery rounded, 

 with a single keel or truncate with a double keel; 

 chambers ovate, hemispherical, angular rhomboid or 

 angular truncate; sutures on the spiral side curved or 

 radial, depressed to elevated, may be limbate and 

 beaded, on the umbilical side sutures curved or radial, 

 depressed or more rarely elevated; wall calcareous, 

 perforate, radial in structure, sxrrface smooth, rugose 

 or beaded; primary apertures interiomarginal, umbilical, 

 in well preserved specimens covered by tegilla, which 

 are perforated by accessory infralaminal and intra- 

 laminal apertures, which are then the only openings to 

 the exterior, the tegilla commonly are partially or 

 wholly broken out in the process of fossilization, or 

 may be preserved only as scalloped fragments. 



Remarks: D'Orbigny described the first species of 

 Globotruncana in 1839 under the name Rosalina lin- 

 neiana. The genus Rosalina had been proposed by 

 d'Orbigny in 1826, with Rosalina globularis as type 

 species. In later years several species of Globotruncana 

 were described as Rosalina (e. g., Rosalina canaliculata, 

 R. marginata, R. stuarti), or Pulvinulina (e. g., Pulvinu- 

 lina tricarinata, P. area). 



Cushman, in 1927, without referring to Rosalina, 

 named the genus Globotruncana with Pulvinulina area 

 as type species. In 1933 Thalmann stated that Rosa- 

 lina d'Orbigny, 1826, was a jimior synonym of Discorbis 

 Lamarck, 1804, and thus not related to the group of 

 species under discussion here. Globotruncana is there- 



