168 



UNITED STATES NATIONAL MUSEUM BULLETIN 215 



(coordinates N:314350 links; E:487360 links); para- 

 type from upper part of small ravine between mileposts 

 12}^ and 12K of the Brasso-Tamana Koad and Navet 

 Kiver (see text-fig. 25); samples K 9077, 8817 (TTOC 

 178166, 177758). 



Remarks: Glohorotalia bullbrooki, new species, is 

 distinguished from 6-. aspensis (Colom) by its more 

 subangular test and by the presence of 4 chambers 

 in the last whorl instead of the 5-7 of that species. 



Glohorotalia crassata (Cushman), often referred to 

 in publications, may be close to the new species. The 

 single spiral view of the holotype given by Cushman 

 (1925) is not sufficient for an accurate determination 

 and comparison. G. crassata as figured by Cushman 

 and Bermudez (1949) shows 5% chambers in the last 

 whorl as against the 4 commonly found in G. bull- 

 brooki. G. crassata var. densa (Cushman) is described 

 as differing from G. crassata in its more rounded com- 

 pact form, rounded periphery, and in having only 4 

 chambers in the last formed coil instead of 5 or 6 as 

 in the typical form. No figure was given by Cushman 

 for this variety. On the basis of the scanty description 

 alone it is not possible to compare it with Glohorotalia 

 bullbrooki or any other possibly synonymous Navet 

 species. 



Specimens found among the middle Eocene forami- 

 niferal fauna of a Mid-Pacific core (see p. 169), are 

 indistinguishable from Glohorotalia bullbrooki, with the 

 exception that they possess small sutural supplemen- 

 tary apertures on the spiral side, which are typical of 

 the genus Truncorotaloides. It is likely that G. bull- 

 brooki also possesses such accessory apertures which, 

 however, cannot be seen due to the poor preservation, 

 and should therefore be placed in the genus Trun- 

 corotaloides. 



The species is named for Mr. J. A. BuUbrook, geolo- 

 gist and archeologist, Trinidad. 



Glohorotalia spinulosa Cushinan 

 Plate 38, Figures 6a-7c 



Glohorotalia spinulosa Cushman, Contr. Cushman Lab. Foram. 



Res., vol. 3, p. 114, pi. 23, figs. 4a-c, 1927.— Beckmann, 



Eclog. Geol. Helvetiae, vol. 46, No. 2, p. 397, pi. 26, fig. 



13, 1953. 

 Glohorotalia {Truncorotalia) spinulosa Cushman, Cushman and 



Bermudez, Cushman Lab. Foram. Res., vol. 25, pt. 2, pp. 



40-41, pi. 8, figs. 1-3, 1949. 



Stratigeaphic range: Hantkenina aragonensis zone 

 to Porticulasphaera mexicana zone, Navet formation. 



Locality: Figured hypotypes (USNM P5744a, b) 

 from the Hantkenina aragonensis zone, Navet forma- 

 tion; in small ravine between mileposts 12 M and 12}^ of 

 the Brasso-Tamana Road and the Navet River, Central 

 Range (see text-fig. 25) ; sample K8820 (TTOC 177760). 



Remarks: Glohorotalia spinulosa Cushman is likely 

 to be the ancestor of G. lehneri Cushman and Jarvis. 

 Forms transitional between the two species are com- 

 mon. Typical G. spinulosa are umbilicoconvex; G. 

 lehneri is very strongly compressed with both sides 

 about equally convex. 



Glohorotalia spinuloinflata (Bandy) 



Plate 38, Figures 8a-c 



Glohigerina spinuloinflata Bandt, Bull. Amer. Paleontol., vol. 



32, No. 131, p. 122, pi. 23, figs, la-c, 1949. 

 Glohorotalia crassula Cushman and Stewart, Beckmann, Eclog. 



Geol. Helvetiae, vol. 46, No. 2, p. 397, pi. 26, fig. 12, 1953. 

 "? Glohorotalia crassata var. densa (Cushman), Cushman and 



Renz, Cushman Lab. Foram. Res., Spec. Publ. 24, p. 40, 



pi. 8, figs. 7, 8, 1948. 



Stratigeaphic range: Hantkenina aragonensis zone 

 to Porticulasphaera mexicana zone, Navet formation. 



Locality: Figured hypotype (USNM P5745) from 

 the Porticulasphaera mexicana zone, Navet formation; 

 same locality as given for Hastigerina micra (Cole) 

 (p. 161); sample Hg 8581 (TTOC 215782). 



Remarks: The figure of the holotype of Glohigerina 

 spinuloinflata Bandy shows a subangular test with an 

 interiomarginal, umbilical-extraumbUical aperture; for 

 these reasons it is placed in Glohorotalia. Although the 

 Trinidad specimens are often somewhat more angular 

 than the figure given by Bandy (1949), they are here 

 included in this species. 



Glohorotalia renzi Bolli, new species 

 Plate 38, Figures 3a-c 



Shape of test very low trochospiral; equatorial 

 periphery almost circular, only very slightly lobate; 

 axial periphery angular with a thin keel. Wall cal- 

 careous, finely perforate, surface smooth or very finely 

 pitted. Chambers strongly compressed; 15-18, ar- 

 ranged in about 2K whorls; the chambers of the last 

 whorl, usually 6 in number, increase fairly rapidly in 

 size. Sutm-es on spiral side curved; on umbilical side 

 radial or very slightly curved, slightly depressed be- 

 tween last chambers. Umbilicus very narrow, shallow. 

 Aperture a low arch, often with a distinct lip, interio- 

 marginal, umbUical-extraumbilical. Coiling almost 100 

 percent dextral throughout the observed range in the 

 Navet formation. Largest diameter of holotype 0.23 

 mm. 



Stratigraphic range: Hantkenina aragonensis zone 

 to Truncorotaloides rohri zone, Navet formation. 



Locality: Holotype (USNM P5741) from the 

 Porticulasphaera mexicana zone, Navet formation; 

 block in the upper Oligocene-lower Miocene Nariva 

 formation, in cutting west of tank 127, north of The 

 Avenue and 850 feet west of its junction with Bon 

 Accord Road, Pointe-a-Pierre; sample Hg 8581 (TTOC 

 215782). The block is no longer existant. 



Remarks: Glohorotalia renzi Bolli, new species, is 

 distinguished from G, lehneri Cushman and Jarvis by 

 its small size and spineless periphery. It usually has 6 

 chambers in the last whorl compared with 4-5 in small 

 specimens of Q. lehneri. 



The species is named for Dr. H. H. Renz of the Mene 

 Grande Oil Company, in recognition of his contribu- 

 tions to micropaleontology in the Caribbean region. 



