6 SiDEBOTTOM, Foraviinif era from the Islattd of Delos. 

 ROTALID^. 



SPIRILLININyE. 



Spirillina, Ehrenberg. 



*Spirillina vivipara, Ehrenberg, and varieties (Fl. i, 

 figs. 12-14, and PI. 2, figs. I — 3). 



Cor'nuspira perforata, Schultze ('54), p. 41, pi. 2, fig. 22. 



Spirillina perforata, Williamson ('58), p. 92, pi. 7, fig. 

 202. 



5". vivipara (Ehrenberg), Parker and Jones ('65), p' 

 397, pi. IS, fig. 28. 



5. perforata (Schultze), Terquem ('75)? P- 21, pi. i, 



fig- 5- 



Spirillina vivipara occurs in several forms, and as the 



variations are slight I have brought them together under 



the above heading. 



*Fig. 12, PI. I, is more concave on the inferior surface 

 than on the superior. The pores on the latter are very- 

 numerous and often coalesce at their edges owing to shell 

 growth, producing a "sandy" effect, which might be mis- 

 taken for minute tubercles in some instances, but the tests 

 do not bear the same character as Brady's ^. tiiberculata 

 of the Challenger report ('84). The pores do not show on 

 the inferior surface. Rare. 



*Fig. 13, PI. I, is distinctly perforated ; concave on 

 the superior side, and flat on the inferior. 



The perforations shew on the inferior surface, but are 

 not quite so obvious as those on the upper side. All the 

 tests appear to be in the megalospheric condition. Rare. 



Fig. 14, PI. I. This variety is concave on both its 

 surfaces. It has a still more sandy appearance on its 

 superior face than Fig. 12, and from the same cause. The 

 inferior surface is decorated with bars, which as they 



