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, 

 "Foraminif^res," p. 192, pi. 11, figs. 28 to 30. — Schlumberger, M6ra.Soc. Zool. France, 

 vol. 6. 1893, p. 217, figs. 29, 30 (in text); pi. 3, figs. 70 to 74; pi. 4, figs. 87 to 90.— 

 Cushman, Proc. U. S. Nat. Mus., vol. 59, 1921, p. 67, pi. 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 faiUng 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 w^ere 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 Schlximberger, 1893. 



Massilina crenata (Karrer). 



(Plate 11, Figure 6.) 



Spiroloculina crenata Karrer, Sitz. Akad. Wiss. Wien, vol. 57, 1868, p. 135, pi. 1, fig. 9. — 

 H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 156, pi. 10. figs. 24 to 26. 



Massilina crenata Cushman. Bull. 71. U. S. Nat. Mus., pt. 6, 1917. p. 57, pi. 20. fig. 2; Bull. 

 100, U. S. Nat. Mus., vol. 4, 1921, p. 445. 



Test in its early development quinquelocuHne, 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 alveolinifonnis Millett. 



Massilina alveoliniformis Millett, Journ. Roy. Micr. Soc. 1898, p. 609, pi. 13, figs. 5 to 7. — 

 Heron-Allen and Earland, Trans. Zool. Soc. London, vol. 20, 1915, p. 584, pi. 45, 

 fig. 16. 



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 



