92 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



to distinguish it. In some of the species in the last-formed chambers 

 there is a tendency to reduce the number of chambers in a volution 

 to two, or even to become almost uniserial as in Uvigerina interrupta 

 H. B. Brady. The surface ornamentation presents a considerable 

 range from smooth and unornamented as in TJ. canariensis d'Orbigny, 

 through the finely striate forms to ones with heavy costse, and these 

 may be broken into spines or the whole test may be spinose, as in 

 TJ. asperula Czjzek and 77. interrupta H. B. Brady. One of the most 

 interesting forms of ornamentation in the genus is the secondary 

 development of spines in TJ. aculeata d'Orbigny, developed in the later 

 chambers first, but progressively extending backward and finally in 

 some cases covering the entire test. 



The genus Uvigerina is known from the Eocene through the later 

 formations of the Tertiary to the present. Some of the species seem 

 to have a limited distribution, both geographically and bathymet- 

 rically, but others, as TJ. pygmxa d'Orbigny, have a much wider range 

 geographically and are found to considerable depths. 



UVIGERINA CANARIENSIS d'Orbigny. 

 Plate 42, fig. G. 



"Testae pineiforme smimisculge " Soldani, Testaceographia, vol. 2, 1798, p. 18, 

 pi. 4, figs. E, F, G, H. 



Uvigerina nodosa, var. B d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 269, No. 3. 



Uvigerina canariensis d'Orbigny, Forarn. Canaries, 1839, p. 138, pi. 1, figs. 25-27. — 

 H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 573, pi. 74, 

 figs. 1-3. — Woodward and Thomas, 13th Ann. Rep. Geol. Nat. Hist. Sur- 

 vey Minnesota for 1884 (1885), p. 171, pi. 4, fig. 37; Geol. Nat. Hist. Survey 

 Minnesota, vol. 3, 1893, p. 39, pi. D, fig. 9. — Egger, Abh. kon. bay. Akad. 

 Wiss. Munchen, cl. n, vol. 18, 1893, p. 311, pi. 9, fig. 43.— Goes, Kongl. 

 Svensk. Vet. Akad. Handl., vol. 25, No. 9, 1894, p. 52, pi. 9, figs. 489-492.— 

 Millett, Journ. Roy. Micr. Soc., 1903, p. 266, pi. 5, fig. 7. — Sidebottom, 

 Mem. Manchester Lit. and Pliilos. Soc., vol. 52, 1908, No. 13, p. 1, pi. 1, 

 figs. 1, 2. — Chapman, Journ. Linn. Soc. Zool., vol. 30, 1910, p. 414. 



Uvigerina urnula d'Orbigny, Foram. Foss. Bass. Test. Vienne, 1846, p. 189, pi. 11, 

 figs. 21, 22. 



Uvigerina irregularis H. B. Brady, Nat. Hist. Trans. Northumberland and Dur- 

 ham, vol. 1, 1865, p. 100, pi. 12, fig. 5. 



Description. — Test elongate, made up of numerous chambers, 

 spirally arranged, three chambers making up each whorl, chambers 

 inflated, rotund, distinctly separated externally by rather deep 

 sutures ; wall smooth, occasionally the early chambers showing traces 

 of costse or spines; aperture usually with a tubular neck and broad 

 phialine lip; color grayish- white. 



Length 1 mm. or somewhat more. 



Distribution. — From the material examined the species seems to 

 be generally distributed in the North Pacific, for the most part in 

 comparatively deep water. It has occurred in Bering Sea, in mate- 



