STUDIES IN FORAMINIFERA 



225 



the internal secondary partitions and are present 

 equally in the central portion of the test and not 

 restricted to the outer margins. 



Length of incomplete holotype (fig. 4) 1.27 mm., 

 breadth 1.30 mm.; length of hj^jotype of figure 5, 1.20 

 mm., breadth 1.22 mm.; length of hypotype of figure 7, 

 0.52 mm., breadth 0.55 mm; length of hypotype of figure 

 8, 1.22 mm., breadth 1.14 mm. Other specimens range 

 up to 2.16 mm. in length. 



Types and occurrence: Cushman and Jarvis de- 

 scribed this species as occurring in the Eocene "Sagrina" 

 beds of Trinidad. At present these beds are con- 

 sidered to be Upper Oligocene in age. 



Holotype (Cushman Coll. 10084) from the "Sagrina 

 Beds," Trinidad Point, Oropouche Lagoon, Trinidad, 

 B. W. I. 



Figured hypotypes (USNM P3086a-c) and unfigiu-ed 

 hypotypes (USNM P3085) from the Upper Oligocene 

 Brasso formation, Tumpuna River, southeast of 

 Bocuno Hill, 3 miles south of Four Road, Central 

 Range, Trinidad, B. W. I. 



Figured sectioned hypotype (USNM P4884) and 

 unfigured hypotj^ies (USNM P3087) from the Brasso 

 formation, Carata Hill West, coal mine area, 3 miles 

 north of Mount Harris, Central Range, Trinidad, 

 B. W. I. 



Family Nodosariidae Schultze, 1854 

 Berthelinella Loeblich and Tappan, new genus 



Pl^TB 72, FiGUEEB &-13 



Type species: Frondicularia paradoxa Berthelin, 

 1879. (Derivation: patronymic, in honor of G. Berthe- 

 lin -heZio, L., diminutive suffix; gender, feminine.) 



Test free, palmate, flattened ; consisting of an elongate 

 proloculus followed by a reduced biserial stage which 

 may consist solely of an ovate second chamber, extend- 

 ing from a point near the aperture of the proloculus 

 along one side nearly to the base, or may consist of two 

 pair of alternating chambers, biserial stage followed by 

 low, broad and equitant chambers extending back on 

 both sides of the apertm-e of the preceding chambers, 

 although early equitant chambers may be slightly asym- 

 metrical ; sutures distinct, depressed to limbate, strongly 

 arched over the center of the test; wall calcareous, 

 finely perforate, surface smooth or faintly ribbed; aper- 

 ture terminal and central, an elongate slit. 



Remarks: Berthelinella, new genus, differs from 

 Frondicularia Defrance in having a reduced biserial 

 early stage of one or two pair of chambers preceding 

 the uniserial development, and a slitlike rather than 

 radiate aperture. Palmula Lea and Neoflabellina Bar- 

 tenstein differ in having a distinctly coiled early portion, 

 Citharinella Marie has an early Citharina-Mike, stage, in- 

 stead of a reduced biserial one. Parafrondicularia 

 Asano has an elongate biserial portion and parallel 

 sides. 



Tappan (1951, p. 14), in a discussion of Sagoplectu, 

 stated that "Frondicularia paradoxa Berthelin, from the 



Jurassic of France, also is biserial with later imiserial 

 equitant chambers. The carinate margins, compressed 

 ttes, and simple roimded aperture suggest that this spe- 

 cies is a lagenid and it should probably be referred to 

 Parafrondicularia. It has been placed in Flabellina, 

 but seems to have a definite biserial early stage, and 

 show no true coiling." 



Some specimens of Frondicularia didyma Berthelin 

 recorded from the Albian at Wissant on the west coast 

 of France, and later also recorded from the Gault of 

 Folkestone, England, as Flabellina didyma (Berthelin) 

 and as Palmula tarrantensis Loeblich and Tappan from 

 the Lower Cretaceous (Upper Albian) Weno and Paw 

 Paw formations of Texas, seem superficially to resemble 

 the present genus. However, although the majority of 

 specimens show only a single eccentric chamber at one 

 side of the proloculus, followed by equitant chambers, 

 as is also true of some specimens of Frondicularia 

 didyma, a rare specimen of P. tarrantensis shows two or 

 three chambers arranged as in Cith-arina, so that it does 

 not have true biseriality as does the present genus. 

 These species have been referred to Frondicularia by 

 Berthelin, to Flabellina by Chapman and Eichenberg, to 

 Palmula by Loeblich and Tappan and to Citharinella 

 by ten Dam. Specimens of the common pseudobiserial 

 form and the rare Citharinella form of C. tarrantensis 

 (LoebUch and Tappan) are here figured (pi. 72, figs. 

 14-16) for comparison with Berthelinella, new genus. 

 These Cretaceous species also differ from Berthelinella 

 in having a typical radiate apertiu-e, as in Citharinella. 



Types and occurrence: Topotypes (USNM 

 P4473a-e) of Berthelinella paradoxa (Berthelin) from the 

 Lower PUensbachian (Lias), below the Ammonites mar- 

 garitatus zone. Lower Jurassic, in a quarry at Saint 

 Vincent Sterlange, Dept. Vendue, France. Collected 

 by H. T. and A. R. Loeblich, Jr., January 23, 1954. 



Hypotype (USNM P4880) of Citharinella tarrantensis 

 (Loeblich and Tappan), from the Gault (Albian, Lower 

 Cretaceous), bed 10, in sea cliffs at Folkestone, Kent, 

 England. Collected bv H. T. and A. R. Loeblich, Jr., 

 September 4, 1953. Hypotype (USNM P4881) of C. 

 tarrantensis (Loeblich and Tappan) from the Denton 

 formation (Albian, Lower Cretaceous) at the Gaines- 

 ville Brick pit, now unworked, southeast of Gainesville, 

 Cooke County, Texas. Collected by H. T. and A. R. 

 Loeblich, Jr., July 1940. Hypotype (USNM P4882) 

 of C. tarrantensis (Loeblich and Tappan) from the 

 Denton formation (Albian), on the west bank of the 

 north fork of Nolands River, 100 feet south of bridge 

 on the Godley-Joshua road, 1 .4 miles NE of Godley, 

 Johnson County, Texas. Collected by H. T. and A. R. 

 Loeblich, Jr., June 1939. 



Tentifrons Loeblich and Tappan, new genus 



Type species: Tentifrons bamardi, new species. 

 (Derivation: tentus, L., hold -\- Jrons, L., f., leaf; gender, 

 feminine.) 



Test free in early stages, with chambers in a citharine 

 arrangement, loosely coiled and becoming uniserial, 

 flattened and palmate with chevron-shaped chambers 



