4 



BULLETIN 11, UNITED STATES NATIONAL MUSEUM. 



water. A single specimen occurred at each, of two Albatross stations 

 D4309 and D4310, and it also occurred off Guam, Nero station 1466. 



SPIRILLINA VIVIPARA Ehrenberg, var. REVERTENS Rhumbler. 

 Plate 1, figs. 3-6. 



Spirillina vivipara H. B. Brady (part), Rep. Voy. Challenger, Zoology, vol. 9, 



1884, pi. 85, fig. 5 (not figs. 1-4). 

 Spirillina vivipara, var. revertens Rhumbler, Zool. 



Jahrb. Abth. Syst., vol. 24. 1906, p. 32, pi. 2, 



figs. 8-10. 



Description.— Test differing from typical S. 

 vivipara in the coiling of the test which is reg- 

 ular in the early ones, then the growing end 

 of the test turns under the disk and grows in- 

 ward so that finally it approaches the middle 

 of the under side. 



Diameter 0.07 to 0.15 mm. 



Distribution. — This variety was found by 

 Rhumbler in material both from Laysan and Chatham Islands. I 

 have had no material referable to this variety. 



SPIRILLINA TUBERCULATA H. B. Brady. 



Plate 1, figs. 7-9; plate 2, fig. 3. 



Spirillina tuberculata H. B. Brady, in Siddall, Proc. Chester Soc. Nat. Sci., pt. 2, 

 1878, p. 50; Quart. Journ. Micr. Sci., vol. 19, 1879, p. 279, pi. 8, fig. 28a, b; 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 631, pi. 85, figs. 12-16.— Egger, 

 Abh. kon. bay. Akad. Wiss. Miinchen, CI. n, vol. 18, 1893, p. 395, pi. 18, 

 figs. 62, 63. 



Fig. 2.— Spirillina vivipara, 

 var. revertens rhumbler. 

 X 250. (After type figure of 

 Rhumbler.) 



Figs. 3, 4.— Spirillina tuberculata H. B. Brady. 3, front view, X 45; 4, apertural view, X 50. 

 (Figures from type figures given by Brady.) 



Description. — Test free, planospiral, usually slightly asymmetrically 

 coiled, flattened or slightly concave on the dorsal face, slightly exca- 

 vated at the umbilicus in microspheric specimens; peripheral border 



