MILIOLIDAE—QUINQUELOCULINA; MASSILINA. 69 
Quinqueloculina dilatata d’Orbigny. 
(Plate 12, Figure 2.) 
Quinqueloculina dilatata d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, 
“ Foraminiféres,” p. 192, pl. 11, figs. 28 to30.—Schlumberger, Mém. Soc. Zool. France, 
vol. 6, 1893, p. 217, figs. 29, 30 (in text); pl. 3, figs. 70 to 74; pl. 4, figs. 87 to 90.— 
Cushman, Proc. U. S. Nat. Mus., vol. 59, 1921, p. 67, pl. 16, fig. 5. 
Test in front view broader than long; chambers compressed; periphery 
rounded; sutures distinct, depressed; chambers with rounded periphery, in 
the adult the last-formed chambers failing to make a complete coil; surface 
smooth; aperture elongate, oval, with a tooth some distance back from the 
aperture itself. 
Length of the Tortugas specimens 0.45 mm. 
The only specimens which can be referred to this species are from 
station 20, where it is rare. These specimens, however, are typical 
in their general shape and agree well with d’Orbigny’s type figures. 
His specimens were from Cuba and St. Thomas. It has also been 
recorded from the Mediterranean by Schlumberger and Wiesner. 
I found the species in material from the north coast of Jamaica, but 
there again it was not common. 
Genus MASSILINA Schlumberger, 1893. 
Massilina crenata (Karrer). 
(Plate 11, Figure 6.) 
Spiroloculina crenata Karrer, Sitz. Akad. Wiss. Wien, vol. 57, 1868, p. 135, pl. 1, fig. 9.— 
H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 156, pl. 10, figs. 24 to 26. 
Massilina crenata Cushman, Bull. 71, U. 8. Nat. Mus., pt. 6, 1917, p. 57, pl. 20, fig. 2; Bull. 
100, U. S. Nat. Mus., vol. 4, 1921, p. 445. 
Test in its early development quinqueloculine, adult chambers in a single 
plane, in front view subelliptical, nearly as broad as long, compressed; cham- 
bers long and narrow, margin crenulate, due to the regular contractions or 
plications of the chamber in the adult; aperture rounded. 
Most of the recent records for this species are from the Indo- 
Pacific. It is interesting, therefore, to find specimens at three of 
the stations in the Tortugas collection. One of these is a very thin, 
flattened species with a translucent test, which may be different from 
the typical form, but it is represented by the single specimen only. 
Massilina alveoliniformis Millett. 
Massilina alveoliniformis Millett, Journ. Roy. Micr. Soc., 1898, p. 609, pl. 13, figs. 5 to 7.— 
eee and Earland, Trans. Zool. Soc. London, vol. 20, 1915, p. 584, pl. 45, 
From three stations there are single specimens which are evidently 
this species, originally described by Millett from the Malay Archi- 
pelago. Heron-Allen and Earland record it also from the Kerimba 
Archipelago, off the east coast of Africa. The largest of our speci- 
mens, representing an adult test, is very close indeed to the original 
figure given by Millett. This is, then, another species which 
definitely connects the West Indian region with that of the East 
Indies and the Indian Ocean. As suggested by Heron-Allen and 
