ART. 14 FORAMINIFERA FEOM TRINIDAD CUSHMAN AND JARVIS 21 



Family TROCHAMMINIDAE 



Subfamily Trochammininae 



Genus TROCHAMMINA Parker and Jones, 1860 



TROCHAMMINA GLOBIGERINIFORMIS (Parker and Jones) 



Plate 6, Figures 2-5 



Lituola glotigeriniforniis Parkeb and Jones, Phil. Trans., vol. 155, p. 407, pi. 15, 



figs. 46, 47, pi. 17, fig.s. 9&-98 ?, 1865. 

 Eaplophragmium glohigerinifornie Caepenter. The microscope, ed. 6, p. 561, 



figs. 320 a, & (in text), 1881. 

 Trochammlna gloiigeriniformis Cushman, U. S. Nat. Mus. Bnll. 71, pt. 1, p. 124, 



figs. 193-195 (in text), 1910. — Cushman and Jarvis, Contr. Cushman Lab. 



Foram. Res., vol. 4, p. 95, pi. 13, figs. 12 a, b, 1928. 



There are numerous excellent specimens of this species in the col- 

 lection from Trinidad. Many specimens are crushed, but a number 

 of them are in their original form like the figured one. These crushed 

 forms are common both at Lizard Springs and in the Hobson clay 

 from San Fernando, Trinidad. The remarks already made under 

 Eaplophragmoides coronata may be applicable to this species as well. 



TROCHAMMINA TRINITATENSIS Cushman and Jarvis 



Plate 6, Figures 6 a-c 



Trochammina trinitatensis Cushman and Jarvis, Contr. Cushman Lab. Foram. 

 Res., vol. 4, p. 95, pi. 13, figs. 13 a-c, 1928. 



Test nearly circular in dorsal view, biconvex from the periphery, 

 trochoid, somewhat keeled, slightly umbilicate on the ventral side; 

 chambers numerous, 12 or more in the final whorl, not very distinct 

 except for the slight collapse of the wall ; central portion of the dorsal 

 side showing the spiral suture slightly depressed ; the sutures of the 

 ventral side nearly radial, slightly curved, depressed ; wall arenaceous 

 with numerous angular fragments and much cement; aperture elon- 

 gate, ventral, at the base of the chamber. Diameter, 0.4; thickness, 

 0.2 mm. 



This is a striking species, appearing at first glance something like 

 an Anomalina but ha^dng an arenaceous test, which is easily collapsed. 



Family LAGENIDAE 



Subfamily Nodosariinae 



Genus ROBULUS Montfort, 1808 



There are numerous species of the Lagenidae in the Cretaceous of 

 Trinidad, nearly all of which have already been described from the 

 Cretaceous of Europe. An examination of the literature shows how 



