52 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 80 



figured specimen is slightly irregular in the last three chambers, but 

 usually these are very uniform in size and shape, the periphery 

 broadly rounded and the sutures distinct and somewhat limbate. 



ANOMALINA RUBIGINOSA Cushman 



Plate 10, Figxjres 3-5 



Anomalina ruhiginosa Cushman, Bull. Amer. Assoc. Petr. Geol., vol. 10, p. 607, 



pi, 21, figs. 6 a-c, 1926. 

 PlanuUna rubk/inosa White, Journ. Pal., vol 2, p. 303, pi. 41, figs. 6 o-c, 1928. 



Test close coiled, the dorsal side slightly convex, ventral side some- 

 what concave, periphery broadly rounded, 9 or 10 chambers in the 

 last-formed coil, rather indistinct, as are also the sutures, more dis- 

 tinct in the last few chambers, dorsal side with the wall very coarsely 

 punctate, ventral side, especially in the earlier portion, with very 

 large depressed areas of an irregular form, giving a peculiar ap- 

 pearance to that portion of the test ; aperture along the ventral margin 

 of the last-formed chamber. Diameter, 0.5-0.8; height, 0.3-0.4 mm. 



This is a common and well-marked species in the Velasco shale of 

 Mexico and occurs in typical form in the Trinidad material. Some 

 of the young stages are also shown here. So far as our material 

 from both areas shows the species does not become sufficiently evolute 

 to warrant placing it in the genus Planulina. 



Genus PLANULINA d'Orbigny, 1826 



PLANULINA CONSTRICTA (v. Hagenow) 



Plate 16, Figures 6 a~c 



Rotalia constricfa v. Hagenow, Neues Jalirb. fiir Min., 1842, p. 571. — Reuss 

 Sitz. Akad. Wiss. Wien, vol. 44, pt. 1, p. 329, pi. 6, fig. 7, 1861 (1862). 



The accompanying figures are of a specimen typical of a Trinidad 

 species that seems identical with that of von Hagenow as figured by 

 Reuss. It is much compressed, has numerous chambers, and in the 

 adult becomes somewhat evolute on both sides. The dorsal side has 

 a thickened umbonal region with a thickened ring about it outside a 

 deep groove. 



Similar forms occur widely distributed in the American Cretaceous. 

 It rather remotely resembles Planulina faylorensis (Carsey), but that 

 is a more evolute form and keeled, with numerous differences. 



PLANULINA SCHLOENBACHI (Reuss) 



Plate 16, Figures 7 a^c 



Rotalia schloen-bachi Reuss, Sitz. Akad. Wiss. Wien, vol. 46, pt. 1, p. 84, pi. 10, 

 figs. 5 a-c, 1862 (1863). 



Test much compressed, evolute, periphery subacute, both sides some- 

 what umbonate; chambers distinct, numerous, of uniform shape, 



