84 BULLETIN" 11, UNIVED STATES NATIONAL MUSEUM. 



POLYMORPHINA LACTEA (Walker and Jacob). 

 Plate 34, fig. 8. 



" 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. — Williamson 

 (part) Rec. For. Great Britain, 1858, p. 71, pi. 6, fig. 147. — H. B. Brady, 

 Parker, and Jones, Trans. Linn. Soc. London, vol. 27, 1870, p. 213, pi. 39, 

 fig. 1 a-c. — H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 559, 

 pi. 71, fig. 11. — Burrows, Sherborn, and Bailey, Journ. Roy. Micr. Soc, 



1890, p. 561, pi. 11, fig. 9.— Wright, Proc. Roy. Irish Acad., ser. 3, vol. 1, 



1891, p. 486.— Crick and Sherborn, Journ. Northampton Nat. Hist. Soc, 

 vol. 7, 1892, p. 71, fig. 25.— Egger, Abh. kon. bay. Acad. Wiss. Miinchen, 

 vol. 18, 1893, p. 308, pi. 9, figs. 8, 14, 15.— Chapman, Journ. Roy. Micr. Soc, 

 1896, p. 9, pi. 2, fig. 3.— Morton, Proc. Portland Soc. Nat. Hist., vol. 2, 1897, 

 p. 119, pi. 1, fig. 7.— Millett, Journ. Roy. Micr. Soc, 1903, p. 261.— Side- 

 bottom, Mem. and Proc. Manchester Lit. and Philos. Soc, vol. 51, No. 9, 

 1907, p. 9, pi. 2, fig. 11 [?].— Chapman, Journ. Quekett Micr. Club, 1907, p. 

 131.— Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 149. 



Description. — Test ovate, nearly symmetrical in transverse section, 

 chambers few, elongate, separated by slightly depressed sutures; 

 wall smooth. 



Length about 0.5 mm. 



Distribution. — This species was recorded by Brady from one 

 Challenger station in the North Pacific, depth 2,300 fathoms, and by 

 Bagg from Albatross station H4579 in 387 fathoms, off the Hawaiian 

 Islands. 



I have not found material which could be referred here. Bagg's 

 specimens which I have examined are too poor for figuring. The 

 figure given here is from Brady. 



POLYMORPHINA LACTEA (Walker and Jacob), var. DIFFUSA Jones and Chapman. 



Plate 41, fig. 8. 



Polymorphina lactea, fistulose form, H. B. Brady, Rep. Voy. Challenger, Zoology, 



vol. 9, 1884, p. 560, pi. 73, fig. 14. 

 Polymorphina spp., var. diffusa Jones and Chapman, Journ. Linn. Soc. London, 



vol. 25, 1896, p. 505, figs. 26-29. 

 Polymorphina lactea (Walker and Jacob), var. diffusa Chapman, Journ. Quekett 



Micr. Club, 1907, p. 131, pi. 10, fig. 1. 



Description. — Early chambers similar to "the typical Polymorphina 

 lactea, but finally developing a "wild growth" of a fistulose form, 

 usually spinose and irregular. 



Distribution. — The specimen figured is from Albatross station 

 D4900, Eastern Sea of Japan, 139 fathoms, bottom temperature 

 52.9° F. It has a much greater development of the fistulose chamber 



