78 



TTDiflTED STATES NATIONAL MUSEUM BULLETIN 215 



side often slightly concave, umbilical side moderately 

 convex; equatorial periphery slightly lobate, elongate; 

 axial periphery subacute to acute but without keel. 

 Wall calcareous, perforate, surface smooth. Chambers 

 moderately to strongly compressed; about 12, arranged 

 in 2^2K whorls, the 6 chambers of the last whorl in- 

 creasing rapidly in size. Sutures on spiral side slightly 

 curved, distinctly depressed; on umbilical side radial, 

 distinctly depressed. Umbilicus fairly wide, open. 

 Aperture a low arch, interiomarginal, extraumbUical- 

 umbilical. Coiling random. Largest diameter of fig- 

 ured hypo type 0.33 mm. 



Stkatigbaphic eange: Ololorotalia pseudomenardii 

 zone to Globorotalia velascoensis zone. Lizard Springs 

 formation. 



Locality: Figured hypotype (USNM P5063) from 

 Trinidad Leaseholds, Ltd., well Guayaguayare 159, 

 Trinidad (coordinates N:151361 links; E:554095 hnks), 

 sample from core 4,212-24 feet (TLL 233002). 



Eemaeks : Globorotalia elongata Glaessner is probably 

 closely related to the 6. ehrenbergi Bolli, new species- 

 G. pseudomenardii Bolli, new species, group. From 

 G. ehrenbergi, it is distinguished by the more elongate 

 equatorial periphery caused by the rapid increase in 

 size of the ultimate and often also the penultimate 

 chamber. From G. pseudomenardii it is distinguished 

 by the more depressed sutiires on the spiral side. The 

 final whorl consists of 6 chambers, instead of 5 as in 

 the other two species and the early portion is depressed 

 in relation to the chambers of the last whorl on the 

 spiral side. 



Globorotalia pusilla pusilla BoUi, new species, new subspecies 

 Plate 20, Figures 8-10 



Shape of test low trochospiral, biconvex, compressed; 

 equatorial periphery nearly circular, slightly lobate; 

 axial periphery acute to subacute. Wall calcareous, 

 perforate, surface smooth. Chambers compressed; 

 12-16, arranged in 2K-3 whorls, the 5-6 chambers of 

 the last whorl increasing moderately in size. Sutures 

 on spiral side strongly curved, shghtly depressed; on 

 umbilical side radial, depressed. Umbilicus narrow, 

 open. Aperture a low arch, with narrow lip; interio- 

 marginal, extraumbilical-umbUical. Coiling random. 

 Largest diameter of holotype 0.24 mm. 



Stratigbaphic range: Globorotalia pusilla pusiUa 

 zone and lower part Globorotalia pseudomenardii zone. 

 Lizard Springs formation. 



Locality: Holotype (USNM P5064) from Trinidad 

 Leaseholds, Ltd., well Guayaguayare 159, Trinidad 

 (coordinates N:151361 links; E:554095 links), sample 

 from core 4,778-90 feet (TLL 233706). 



Remarks: Globorotalia pusilla pusilla Bolli, new 

 species, new subspecies, is distinguished from G. 

 capdevilensis Cushman and Bermudez by its closer 

 coiling, stronger curved sutures on the spiral side and 

 slightly less compressed chambers. The new subspecies 

 differs from G. albeari Cushman and Bermudez in 

 having fewer chambers in the last whorl (about 5 

 instead of 8-10) and in being less trochospiral. 



Globorotalia pusilla laevigata BoUi, new species, new subspecies 

 Plate 20, Figures 5-7 



Shape of test low trochospiral, biconvex, compressed; 

 equatorial periphery circular, slightly lobate; axial 

 periphery acute, last chambers often with a faint keel. 

 Wall calcareous, perforate, surface smooth. Chambers 

 strongly compressed; 12-16, arranged in about 3 whorls; 

 the 5-6 chambers of the last chamber increasing 

 moderately in size. Sutures on spiral side strongly 

 curved; on umbihcal side radial. Umbihcus narrow, 

 open. Aperture a low arch; interiomarginal, extra- 

 umbilical-umbilical. Largest diameter of holotype 

 0.28 mm. 



Stratigraphic range: Globorotalia pseudomenardii 

 zone. Lizard Springs formation. 



Locality: Holotype (USNM P5065) from northeast 

 bank of Tank Farm at the old Club Site, Pointe-a- 

 Pierre, Trinidad (coordinates N:256950 links; E:380000 

 Imks), sample K. 10832 (TLL 228674). 



Remarks: Globorotalia pusilla laevigata Bolli, new 

 species, new subspecies, is closely related to G. pusilla 

 pusilla Bolli, new species, new subspecies, from which 

 it develops. The subspecies laevigata is distinguished 

 from the subspecies pu^Ula by its more circular outline 

 and acute axial periphery and by its spiral sutures 

 not being depressed. 



Globorotalia tortiva Bolli, new name 



Plate 19, Figures 19-21 



Globigerina velascoensis var. compressa White, Journ. Paleontol., 

 vol. 2, No. 3, p. 196, pi. 28, figs. 3a-b, 1928. 



Shape of test very low trochospiral, spiral side almost 

 flat, umbilical side strongly convex; equatorial periphery 

 lobate, chambers give a quadrangular to pentagonal 

 outline; axial periphery rounded to subangular. Wall 

 calcareous, perforate, surface finely spinose. Chambers 

 laterally strongly compressed; 10-12, arranged in 2-2)^ 

 whorls, the 4-4 K chambers of the last whorl increasing 

 rapidly in size. Sutures on spiral side curved in early 

 chambers, often straight, oblique between penultimate 

 and ultimate chambers, depressed; on umbilical side 

 radial or slightly curved, depressed. Umbilicus nar- 

 row, open. Aperture a high arch; interiomarginal, 

 extraumbilical-umbilical. Coiling 85 percent dextral 

 in the only sample investigated. Largest diameter of 

 holotype 0.33 mm. 



Stratigraphic range: Lower part of Globorotalia 

 pseudomenardii zone. Lizard Springs formation. 



Locality: Hypotype (USNM P5066) from Trinidad 

 Leaseholds, Ltd., well Guayaguayare 159, Trinidad 

 (coordinates N:151361 links; E:554095 linlis), sample 

 from core 4,434^6 feet (TLL 233005). 



Remarks: White (1928) described an identical form 

 from Mexico under the name Globigerina velascoensis 

 var. compressa. The interiomarginal, extraumbilical- 

 umbUical position of the aperture places it within the 

 genus Globorotalia where it becomes a homonym of 

 G. compressa (Plummer). For this reason the new 

 name G. tortiva is proposed . G. tortiva possibly branched 



