78 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 



Biloculina denticulata H. B. Brady. 



Biloexdina ringens (Laiimrrk) var. denticulata H. B. Brady, Rep. Voy. Challenger, Zoology, 



vol. 9. 18S4. p. 143, pi. 3, figs. 4. 5. 

 Biloexdina denticulata Cushman, Bull. 71. U. S. Nat. Mus.. pt. 6, 1917, p. 180, pi. 33, fig. 1; 



Pioc. U. S. Nat. Mus., vol. 59, 1921, p. 74. 



Although not occurring in any such numbers as the preceding 

 species, Biloculinn denticulata has occurred at most of the stations 

 from which material was studied. It is smaller and does not reach 

 the fine development common in shallow water of the East Indies 

 and Philippine regions. The largest Tortugas specimens are about 

 0.80 mm. The denticulate border at the base is not always present, 

 but the general shape and character of the specimens, even without 

 this, prove their identity. 



Biloculina denticulata H. B. Brady var. striolata H. B. Brady. 



Biloculina ringens (Lamarck) var. striolata H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 

 9. 1884, p. 143. pi. 3, figs. 7, 8.— Millett, Journ. Roy. Micr. Soc, p. 1898, 262, 

 pi. 5. fig. 8.— Cushman, Bull. 71, U. S. Nat. JMus.. pt. 6, 1917, p. 80. pi. 33, figs. 

 2,3. 



There are a few specimens of this striate variety which differ from 

 the usual form in having the markings over the entire test rather 

 than the basal portion only. In addition, there are a few specimens 

 referred here which may not be this variety. They have a much 

 more rounded form at the base rather than the compressed plate- 

 like form so common in the typical. 



Genus PENEROPLIS Montfort, 1808. 



The treatment of the Tortugas material of this genus follows that 

 which I have already used in a paper on the Foraminifera of the 

 north coast of Jamaica (Proc. U. S. Nat. Mus., vol. 59, 1921). This 

 in turn largely foHowed the treatment of the species given by 

 Heron-Allen and Earland in their paper on the Foraminifera of the 

 Kerimba Archipelago (Trans. Zool. Soc. London, vol. 20, 1915). 



These various species seem distinct in the Tortugas collection. 



Peneroplis pertusus (Forskal). 



Nautilus pertusus Forskal, Descr. Anim., 1775, p. 125, No. 65. 



Peneroplis pertusus Jones, Parker, and Brady, Foram. Crag., 1865, p. 19. — H. B. Brady, 

 Rep. Voy. Challenger, Zoology, vol. 9. 1884, p. 204, pi. 13, figs. 16, 17.— Cushman, 

 Proc. U. S. Nat. Mus.. vol. 59. 1921, p. 75, pi. 18, figs. 7, 8. 



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

 niferes," p. 61, pi. 7, figs. 1, 2. 



This is one of the least common of the species found in this col- 

 lection. It was not common in the Jamaican material either, and 

 is evidently not as common in the West Indian region as in some 

 parts of the Indo-Pacific. The species described by d'Orbigny as 

 P. elegans seems undoubtedly to be this species, D'Orbigny had 

 this from both Cuba and Jamaica. 



