16 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 
the “siphon” of the final chamber. * 165. 2a, Dorsal view of holotype 
(U.S.N.M. No. P5107). 2b, Ventral view. 2c, Edge view. From 
Carenage Swamp, Trinidad. X 165. 
Fig. 3. Trochammina laevigata Cushman and Bronnimann.............. 
3a, Dorsal view of hypotype (U.S.N.M. No. P5106). 3b, Ventral view, 
and 3c, edge view, both showing the well-developed lip over the 
aperture. From Carenage Swamp, Trinidad. X 120. 
PLATE 4 
TROCHAM MINIDAE 
Figs. 1-4. Tiphotrocha comprimata (Cushman and Bronnimann) emend. 
SATIGETS 6:5 5 since. ope'aie niente ota jolate ley aeenmelads uate es aiece \eta sehen ce ae 
1a, Dorsal view of hypotype (U.S.N.M. No. Ps5109a) showing the 
chambers of the last whorl elongated in the axis of coiling. 1b, 
Ventral view showing the apertures of the chambers of the last whorl 
opening separately into the umbilicus. 1c, Edge view. 2a, Dorsal view 
of small hypotype (U.S.N.M. No. P5110). 2b, Ventral view showing 
less well developed ventral lobes on the chambers of the last whorl 
and apertures opening separately into the umbilicus. 2c, Edge view. 
3, Ventral view of hypotype (U.S.N.M. No. P5112) showing a plate- 
like cover over the umbilicus fusing with the ventral lobes of the 
chambers and obscuring the apertures. 4, Ventral view of hypotype 
(U.S.N.M. No. P5109b) showing the large ventral lobe oi the final 
chamber partially obscuring the umbilicus. All from Ortoire River, 
Trinidad. X< 106. 
Fig. 5. Arenoparrella mexicana (Kornfeld) emend. Andersen........... 
5a, Dorsal view of hypotype (U.S.N.M. No. P5113) showing eight of 
the areal apertures of the last chamber. 5b, Ventral view showing 
the interiomarginal aperture and three of the areal apertures in the 
last chamber. 5c, Edge view showing the interiomarginal aperture 
and 12 areal apertures in the last chamber. From Ortoire River, 
Trinidad. & 122. 
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