. Bulletin of the British Museum (Natural History), Geology. 54 J. E. WHITTAKER & R. L. HODGKINSON Material. 7 specimens. NB 9450, 9452. Variation. Length 0-22-0-39 mm, breadth 0-16-0-30 mm, thickness 0-16-0-27 mm. Remarks. Test smooth, almost as thick as broad. There is little difference in the density of per- forations over the body of the shell, except in the apertural region where it is transparent. Family BOLIVINITIDAE Cushman, 1927 Genus BOLIVINA d'Orbigny, 1839 Type-species: Bolivina plicata d'Orbigny, 1839. Bolivina sabahensis sp. nov. Figs 52-53c; PI. 4, fig. 4 Diagnosis. A modera
. Bulletin of the British Museum (Natural History), Geology. 54 J. E. WHITTAKER & R. L. HODGKINSON Material. 7 specimens. NB 9450, 9452. Variation. Length 0-22-0-39 mm, breadth 0-16-0-30 mm, thickness 0-16-0-27 mm. Remarks. Test smooth, almost as thick as broad. There is little difference in the density of per- forations over the body of the shell, except in the apertural region where it is transparent. Family BOLIVINITIDAE Cushman, 1927 Genus BOLIVINA d'Orbigny, 1839 Type-species: Bolivina plicata d'Orbigny, 1839. Bolivina sabahensis sp. nov. Figs 52-53c; PI. 4, fig. 4 Diagnosis. A moderately compressed Bolivina with a subovate periphery in apertural view. Sides of test sub-parallel, all but the last few chambers ornamented by irregularly developed longitudinal striae which cross and mask the early Figs 52-53c Bolivina sabahensis sp. nov. 52, P50113. Holotype (microspheric form), side view in clearing medium. See also PI. 4, fig. 4. 53a-c, P50114. Paratype (megalospheric form). Side view in clearing medium, edge and aper- tural views. Both from sample NB 9450. x 85. Name. Described from Sabah, Malaysia. Holotype. BM(NH) reg. no. P50113, from sample NB 9450. Material. 41 specimens. NB 9447, 9450. Description (Holotype: microspheric). Test biserial, calcareous, coarsely perforate, sides hardly tapering except at initial end. Ovate in apertural view with subacute peripheries; thickness virtually constant in edge view. Initial chamber pointed; chambers, 13 in each series, increasing regularly in size and becoming slightly inflated. Ornament of irregular longitudinal striae best developed in early part of the test; on later part restricted to basal portion of chambers where it tends to overlap the sutures. Depressed sutures only seen between last three pairs of chambers. Aperture elongate, sub-terminal, reaching base of apertural face. Dimensions (Holotype). Length 0-67 mm, breadth 0-20 mm, thickness 0-13 mm. Variation. Size range of paratypes: Microspheri
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