3G SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 

 Globigerina eequilateralis H. B. Brady var. 



There is a single broken specimen which suggests the variety invo- 

 luta Cushman, which I have described from the Phihppine region. It 

 is, however, too broken to be positively identified. 



An interesting thing about the specimen, however, is that while 

 the later chambers are smooth, those of the early coils, which are 

 exposed in the breaking of the specimen, show long spines still 

 attached. 



Globigerina dutertrei d'Orbigny. 

 (Plate 5, Figures 8, 9.) 



GlobU/erina dutertrei d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, "Forami- 

 nifferes," p. 84, pi. 4, figs. 19 to 21.— H. B. Brady, Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 601, pi. 81, figs. 1 a to c— Cushman, Bull. 71, U. S. Nat. Mua., 

 pt. 4, 1914, p. 8; Proc. U. S. Nat. Mus., vol. 59, 1921, p. 55, pi. 12, fig. 7. 



Test rot aliform, generally rounded, very convex on the ventral side, the 

 last coil usually consisting of 5 chambers; chambers gradually increasing in 

 size, the later ones much inflated; sutures depressed; aperture single, on the 

 inner margin of the last-formed chamber in the umbilicate area; color white. 



Length of the Tortugas specimens 0.6 mm. 



Specimens occurred only at the deeper-water station off Logger- 

 head Key Light, in 18 fathoms, and were not noticed in the tow net. 

 D'Orbigny originally described this species from Cuba and recorded 

 it also from Martinique and Guadeloupe. I have recorded it from 

 Montego Bay and Runaway Bay, on the north coast of Jamaica. 

 It seems to be widely distributed in deep water. 



Globigerina rubra d'Orbigny. 



(Plate 14, Figures 1, 2.) 



Globigerina rubra d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839. "Forami- 

 nifferes," p. 82, pi. 4, figs. 12 to 14. 



Test composed of several inflated chambers arranged in an elongate 

 trochoid spire of about 3 volutions, each with 3 chambers; walls reticulate, 

 with spines in pelagic specimens; aperture an arched opening at the umbilical 

 border of the chamber, and in the later chambers this is supplemented by 

 two or more nearly circular openings on the upper border of the chamber 

 near its connection with the preceding chambers; color of the early chambers, 

 sometimes of all the chambers, pink. 



Length of the Tortugas specimens about 0.75 mm.; diameter slightly less. 



D'Orbigny described this species from shore sands of Cuba, record- 

 ing it also from Jamaica, Guadeloupe, and Martinique. I recorded 

 the species from shallow water off the north coast of Jamaica (Proc. 

 U. S. Nat. Mus., vol. 59, 1921, p. 55, plate 12, fig. 6). It occurred 

 as few specimens at several stations in the area and was almost 

 always found, although not in any great numbers, in the tow nets. 

 It is abundant in the deeper water of the Caribbean, Gulf of Mexico, 

 and the Atlantic regions. 



