ART. 14 FOEAMINIFERA FROM TRINIDAD CUSHMAN AKD JARVIS 53 



gradually increasing in size as added ; sutures distinct, curved, limbate, 

 and raised; wall of the chambers smooth, coarsely perforate, umbo 

 very coarsely pitted ; aperture peripheral and extending over onto the 

 dorsal side. Length, 0.8 ; breadth, 0.7 ; thickness, 0.3 mm. 



This species with its strongly raised sutures and coarsely pitted 

 umbos seems to be identical with that described by Keuss from the 

 Cretaceous of Europe in the reference given above. It is a very 

 distinctive form. 



PLANULINA sp. (?) 



Plate 16, Figubes 8 Or-o 



The specimen figured seems to have characters in common with that 

 described by Reuss ^^ from Europe as " Rotalia involida^'' and witli 

 " Rotalia mortoni " ^* from the Cretaceous of New Jersey, but more 

 material is needed for determining the full characters of this form. 



" Sitz. Akad. Wiss. Wien, vol. 44, pt. 1, p. 313, pi. 2, figs. 4 a, I, 1861 (1862). 

 " Idem, p, 337, pi. 8, figs. 1 a^c. 



