Manchester Memoirs, Vol. Hi. (1908), No. 13. 7 



approach the centre of the test assume the form of 

 tubercles. It is still more concave than the upper side. 

 Rare. 



*Fig. I, PI. 2. This variety has the superior surface 

 of the test very much crinkled, and either flat or very 

 slightly concave. The inferior side is distinctly per- 

 forated. Rather frequent. 



Fig. 2, PI. 2. A single example only was found, 

 which I think may be brought under this designation. 

 Its peripheral edge is rounded, the chambers are slightly 

 embracing, and the underside of the test is free from 

 markings. It is possible that this specimen may be 

 identical, or nearly so, with the shell figured in the mono- 

 graph of the Crag, by Jones and others ('66 — '97), pi. 6, 

 fig. 22, under the name of 5. vivipara, Ehrenberg, var. 

 minima, Schacko (var. iinilinearis, nov., in the explanation 

 of the plate). There is a certain amount of shell growth 

 running along the inner edge of the coil, which interferes 

 with the clear examination of the markings. When 

 damped these markings appear to me to partake more of 

 the nature of ridges than of the coarse perforations which 

 are distinctive of var. minima. My drawing of this example 

 had better, therefore, be taken with a certain amount of 

 reservation. 



Fig. 3, PI. 2. Another solitary example was found 

 suffering from the same obscuration of the markings as 

 the one above, and when damped it seemed to reveal the 

 same ridge-like markings. The test is very concave on 

 the upper surface, and flat on the lower one. Its upper 

 edge is rounded and its side oblique. It is possible that 

 this is a passage form, in the direction of S. incEqualis 

 Brady ('84). Tests of a similar contour, but without the 

 markings, occur off Raine Island, Challenger Station, 

 185. 



