34 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 



Polymorphina gibba d'Orbigny. 

 (Plate 4, Figure 9.) 



"Polymorphina Subcordiformia vcl Ovifonnia" Soldani, Testaceographia, vol. 1, pt. 2, 

 1791, p. 114, vol. IVi, fiRs. iz, C, etc. 



Polvmorj^ina (Globulina) gibha d'Orbigny. Ann. Sci. Nat., vol. 7, 1826, p. 226, No. 20; Mo- 

 dules, 1826. No. 63. — EgRor, Neucs Jahrb. flir Min., 1857, p. 288, pi. 13. figs. 1 to 4. 



Polvmorphina gibba H. B. Brady, Parker, and Jones (part), Trans. Linn. Soc. London, 

 vol. 27, 1870, p. 216, pi. 39, figs. 2 a to d.—ll. B. Brady, Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 561. pi. 71, figs. 12 o, b. — Cushman, Bull. 71, U. S. Nat. 

 Mu8., pt. 3. 1913, p. 85, pi. 41, fig. 4. 



Test rotund, front view nearly circular, end view broadly oval; visible 

 chambers few, broad; sutures slightly excavated; wall smooth; aperture 

 somewhat produced. 



Length of the Tortugas specimens not over 0.5 mm. 



There are single specimens from two stations which may be re- 

 ferred to this species. 



Polymorphina lactea (Walker and Jacob) var. 



(Plate 4, Figures 10, 11.) 



There are a few specimens of a small rounded form with a slightly 

 roughened surface which I have referred to this species. They are 

 not typical, however, the rough surface seeming to be constant, and 

 one of the specimens which is here figured (plate 4, fig. 10) is attached 

 to a calcareous fragment by slight stolon-like processes. 



Polymorphina sp.? 

 (Plate 4, Figure 4.) 



There is a single specimen which is here figured (plate 4, fig. 4), 

 with a smooth surface, generally fusiform shape, and few-chambered, 

 which, in the absence of further material, I have not wished to place 

 under a specific name. 



Polymorphina sp. 



(Plate 5, Figure 1.) 



The specimen figured (plate 5, fig. 1) may possibly be related to 

 the preceding and may be only an irregular specimen. Under these 

 conditions it does not seem warranted that this should be placed 

 under a definite name. 



Genus UVIGERINA d'Orbigny, 1826. 



Uvigerina angulosa Williamson. 



(Plate 5, Figures 3, 4.) 



There are a few specimens which can be referred to this species. 

 They are small, and, as shown by the specimen figured (plate 5, 

 fig. 4), there is a tendency in the later development for the chambers 

 to become more remote than in the early development. At the same 

 time, the characteristic ornamentation of longitudinal costae seems 

 to be lacking in these last-formed chambers. The specimens are 

 all small, not exceeding 0.5 mm. in length. 



