SYSTEMATIC ACCOUNT 49 



Six specimens found at St. 421 appear to be referable to Seguenza's species, which 

 was described from a yellow Miocene marl from Sicily. 



Seguenza describes his form as ovate, rough, rounded at the base, bluntly pointed at 

 the oral extremity; surface roughly spinous, with a very obtusely rounded keel. His 

 single figure illustrating the side view does not indicate much compression of the test ; 

 indeed he described the shell as only slightly compressed because the carina is very 

 obtuse and rounded. 



His specimens were presumably worn. The Scotia series shows every range between 

 a specimen like Seguenza's figure, and one in which there is a distinctly produced neck 

 from which a delicate carina extends down the edges for three-quarters of the length of 

 the test. In a perfect specimen the carina would probably extend round the base also. 

 The surface of the test is opaque, rough and finely hispid ; the carina is glossy and 

 smooth. 



Length 0-2 mm. Breadth 0-14 mm. Thickness o-o8 mm. 



The variety is clearly allied to L. marginata, and its chief interest lies in the fact that 

 while the flask-shaped Lagenae exhibit a complete range of surface roughness between 

 L. aspera and L. hispida, there is so far as I remember no other record of a compressed 

 Lagena with a hispid surface. 



The depth and distance from the Antarctic coast-line at St. 421 are, I think, sufficient 

 to forbid any question of regarding the specimens as derived from a Miocene deposit 

 ashore. 



161. Lagena marginata var. raricostata, Sidebottom. 



Lagena marginata. Walker and Boys, var.nov. raricostata, Sidebottom, 1912, etc., LSP, 1912, 

 p. 408, pi. xviii, figs. 8, 9; 1913, p. 187. 

 One station : 447. 



A single good specimen. 



162. Lagena marginata var. semimarginata, Reuss (F 222) (A 369). 

 One station : 447. 



A single specimen. 



163. Lagena marginata var. spinifera, Earland (A 370). 

 Two stations: 421, 447. 



Frequent at St. 421 ; rare but large at St. 447. 



164. Lagena orbignyana (Seguenza) (F 240) (SG 236) (A 374) (Plate I, figs. 54, 55, 

 60, 61). 



Three stations: 417, 418, 421. 



Rare at St. 417, where two distinct forms occur. One is the typical North Atlantic 

 variety with oval body and three feeble keels of approximately equal breadth figured by 

 Brady (B. 1884, FC, pi. lix, fig. 25). The other has an almost circular body, and the 

 median keel is very wide, especially round the base. It seems to resemble the variety 

 separated by Cushman (C. 1910, etc., FNP, 1913, p. 45. pl- xxiii, fig. i) as var. data. 



