no. 2360. FORAM1NIFERA FROM JAMAICA— CUSHMAN. 71 



D'Orbigny's material was from Cuba and Jamaica. It has occurred 

 only at the very shallow stations, 1 and 2 at Montego Bay and also at 

 Runaway Bay. 



TRILOCULINA QUADRILATERALIS d'Orbigny. 



Triloculina quadrilateralis d'Orbigny, Foram. Cuba, 1839, p. 173, pi. 9, figs. 14-16. 



Specimens of this species were found in the dredgings from Mon- 

 tego Bay from stations 4 and 5. D'Orbigny's specimens were from 

 Cuba. It is somewhat variable, as he says, and the chambers are 

 not all quadrilateral, especially the younger ones. 



TRILOCULINA CAR1NATA d'Orbigny. 



Plate 17, figs. 9, 10. 

 Triloculina carinata d'Orbigny, Foram. Cuba, 1839, p. 179, pi. 10, figs. 15-17. 



This is the most common reticulate species of the Jamaican material. 

 It is very common at stations 1, 2, 4, and 6, at Montego Bay. The 

 form is constant and the reticulations rather fine and regular as shown 



Fig. 11.— Triloculina quadrilateralis d'Orbigny. a, side 

 view; 6, opposite side; c, apep.tural view. Specimen from e 

 fathoms, Montego Bay. x 50. 



by d'Orbigny. The basal portion of the last chamber sometimes 

 becomes bifurcate. The species reminds one strongly of var. reticulata 

 Heron-Allen and Earland, of Ifassilina secans d'Orbigny. 



TRILOCULINA CARINATA d'Orbigny, var. OBSCURA, new variety. 



Plate 17, fig. 11. 



Description, — Test in the early stages as in the typical, but later 

 adding a covering of closely cemented sand grains which may become 

 thick and entirely hide the reticulations. 



Type specimen (U.S.N.M. No. 15991), from station 6 in Montego 

 Bay, Jamaica, in 10 fathoms (18 meters). At this station it was 

 abundant and also found at stations 2, 4, and 5. 



It was only when the under surface occasionally showed through 

 in places that the true relation of this abundant variety was seen. 

 In some specimens the coating is of very fine sand grains covering 

 but not entirely obscuring the reticulations, but in others it may 

 show only in small portions, or be entirely covered and the reticula- 

 tions wholly obscured. 



