6 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



Spirillina decorata Brady, var.- — Sidebottom, 1908, Mem. Proc. Manchester 

 Lit. Philos. Soc, vol. 52, no. 13, p. 8, pi. 2, fig. 6. — Cushman, Todd, and 

 Post, 1954, U.S. Geol. Surv. Prof. Paper 260-H, p. 357, pi. 88, fig. 35. 



A single specimen from 21 fathoms, Guam Anchorage, Ladrone 

 [Marianas] Islands, shows the spinose periphery typical of this species. 



This rare species is probably widespread in shallow warm waters, 

 having been reported from the Mediterranean as well as several 

 Pacific localities. 



SPIRILLINA VIVIPARA Ehrenberg 



Spirillina vivipara Ehrenberg. — Brady, 1884, Rep. Voy. Challenger, Zoology, 

 vol. 9, p. 630, pi. 85, figs. 1-5.— Egger, 1893, Abh. kon. bay. Akad. Wiss., 

 Miinchen, CI. II, vol. 18, p. 394, pi. 18, figs. 56-58.— Flint, 1899, Ann. Rep. 

 U.S. Nat. Mus. for 1897, p. 326, pi. 71, fig. 4.— Cushman, 1924, Carnegie 

 Instit. Washington, Publ. 342, p. 30, pi. 9, figs. 1, 2. — Cushman and Valen- 

 tine, 1930, Contr. Dept. Geol. Stanford Univ., vol. 1, no. 1, p. 22, pi. 6, 

 fig. 4.— Cushman, 1931, U.S. Nat. Mus. Bull. 104, pt. 8, p. 3, pi. 1, figs. 

 1-4.— Phleger and Parker, 1951, Geol. Soc. Amer. Mem. 46, pt. 2, p. 25, 

 pi. 13, figs. 3, 4. — Parker, 1958, Rep. Swedish Deep-Sea Exped., vol. 8, Sedi- 

 ment Cores, no. 4, p. 264, pi. 3, fig. 4. 



Spirillina vivipara var. densepunctata Cushman. — Cushman, Todd, and Post, 

 1954, U.S. Geol. Surv. Prof. Paper 260-H, p. 357, pi. 88, fig. 31. 



This widespread species is distinguished from other species of this 

 genus by its rounded instead of truncate periphery. Except for its 

 conspicuous pores, appearing as white dots in the dark transparent 

 wall, it is unornamented. Its coiling is planispiral and the test is 

 very slightly depressed in the center of both sides. The later coils 

 do not overlap the earlier ones and the spiral suture is distinct and 

 slightly depressed. The density of the pores is variable and is usually 

 greater in the later than in the earlier coils. 



The form described as the variety densepunctata Cushman appears, 

 from re-examination of the holotype and two other identified speci- 

 mens, to be synonymous with the subspecies revertens Rhumbler, which 

 is separated from the typical form of the species by the inward turning 

 of the end of the coil and by its trochoid instead of planispiral coiling. 



The above synonymy lists only a few of the many records of this 

 species and indicates that it probably has a worldwide distribution in 

 shallow waters. 



SPIRILLINA VIVIPARA REVERTENS Rhumbler 



Spirillina vivipara var. revertens Rhumbler, 1906, Zool. Jahrb., Abt. Syst., vol. 



24, p. 32, pi. 2, figs. 8-10; 1911, Foram. Plankton-Exped., pt. 1, pi. 5, fig. 8; 



pi. 6, figs. 7-10; 1913, pt. 2, p. 430.— Cushman, Todd, and Post, 1954, U.S. 



Geol. Surv. Prof. Paper 260-H, p. 357, pi. 88, fig. 30.— Todd, 1957, U.S. 



Geol. Surv. Prof. Paper 280-H, p. 290 (table 4), pi. 90, fig. 2. 

 Spirillina vivipara Ehrenberg var. densepunctata Cushman, 1931, U.S. Nat. 



Mus. Bull. 104, pt. 8, p. 4, pi. 1, fig. 5.— Cushman and Parker, 1931, Proc. 



U.S. Nat. Mus., vol. 80, art. 3, p. 18, pi. 4, fig. 1. 



