146 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



possibly also in tlie Mediterranean. It seems therefore that other 

 species of this genus when their characters are clearly defined and 

 plenty of material is available for examination, will be found to 

 have distributions equally clearly delimited, as in the case of other 

 species of the foraminifera. 



POLYMORPHINA LACTEA (Walker and Jacob). 



Plate 39, figs. 9, 11. 



" Serpula tenuis ovalis laevis " Walker and Boys, Test. Min., 1784, p. 2, 

 pi. 1, fig. 5. 



" Polymorpha Subcordiformia vel Oviformia " Soldani, Testaceographia, 

 vol. 1, pt. 2, 1791, p. 114, pi. 112, figs. 11, nn, etc. 



Serpula lactea Walker and Jacob, Adams' Essays, ed. 2, 1798, p. 634, pi. 

 24, fig. 4. 



Vermiculum lacteum Montagu, Test. Brit, 1803, p. 522. 



Polymorphina lactea Magillivray, Moll. Aberd., 1843, p. 320. — William- 

 son (part), Rec. Foram. Great Britain, 1858, p. 71, pi. 6, fig. 147. — 

 (The following are Atlantic records referred to this species). — Balk- 

 will and Wright, Proc. Roy. Irish Acad., ser. 2, vol. 3, 1882, p. 549. — 

 H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 559.— Balk- 

 will and Wright, Trans. Roy. Irish Acad., vol. 28, 1885, p. 345.— H. B. 

 Brady, Journ. Roy. Micr. Soc, 1887, p. 912. — H. B. Brady, Parker, and 

 Jones, Trans. Zool. Soc, London, vol. 12, 1888, p. 224, pi. 44, fig. 11.— 

 Pearcey, Trans. Glasgow Nat. Hist. Soc, vol. 2, 1890, p. 178. — Wright, 

 Proc. Roy. Irish Acad., ser. 3, vol. 1, 1891, p. 486. — Woodward, The 

 Observer, vol. 4, 1893, p. 144.— Wright, Irish Nat., vol. 9, No. 3, 1900, 

 p. 54. — Whiteaves, Geol. Survey Canada, 1901, p. 10. — Earland, Journ. 

 Quekett Micr. Club, ser. 2, vol. 9, No. 57, 1905, p. 216.— Balkwill and 

 Millett, Recent Foram. Gahvay, 1908, p. 6. — Heron-Allen and Ear- 

 land, Journ. Roy. Micr. Soc, 1907, p. 430 ; Proc Roy Irish Acad., vol. 

 31, pt. 64, 1913, p. 100, pi. 8, fig. 16; Trans. Linn. Soc London, ser. 2, 

 vol. 11, 1916, p. 264 ; Journ. Roy. Micr. Soc, 1916, p. 48. 



The figure of Williamson may be taken as a typical western Euro- 

 pean form of this species. Under this name in the literature are to 

 be found a considerable collection of figures covering a variety of 

 things not all of which certainly can be one species. Such forms as 

 that figTired by Williamson occur on the coast of the British Isles, 

 and I have specimens of similar form from Iceland. 



On the western side of the Atlantic another form is common in 

 shallow water especially off the New England coast. This is here 

 described. 



POLYMORPHINA LACTEA (Walker and Jacob), var. NOVANGLIAE, new variety. 



Plate 39, figs. 6-8. 



Polymorpliina lactea Cushman (not Walker and Jacob), Proc. Boston Soc 

 Nat. Hist, vol. 34, 1908, p. 28. 



Desc7ij)tion. — Variety differing from the typical in the form of 

 the test which is elongate, fusiform, the initial end rounded, aper- 

 tural end slightly drawn out, wall smooth; sutures not depressed. 



Length up to 2 mm. 



