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



The above remarks apply also to this form, except 

 that this latter one is very frequent. 



Discorbina nitida, Williamson. (PI. 4, fig. 6). 



Rotalina nitida, Williamson ('58), p. 54, pi. 4. figs. 

 106-108. 



R. nitida (Williamson), Terquem ('75), p. 26, pi. 2, 

 fig. 9. 



There are very fine examples of this transparent and 

 complanate Discorbina. The sutures are marked by fine 

 lines, and the outside edge of the chambers in the later 

 whorls is flattened. The largest specimens shew only 

 three chambers in the final convolution. Rather rare. 



*Discorbina orbicularis, Terquem, sp. (PI. 4, fig. 7). 



Rosalina orbicularis, Terquem ('75), P- 75, pl- 9, fig- 4- 

 Discorbina orbicularis (Terquem), Balkvvill and Wright 



('85), P- 349, pl- 13, figs- 3 1-33- 



D. orbicularis (Terquem), Brady ('84), P- 647, pl. 88, 

 figs. 4-8. 



The tests are typical, and in some of the larger 

 examples the limbation is well marked. Rather rare. 



Discorbina imperatoria, d'Orbigny, sp. (Pl. 5, figs, i, 2.) 



Rosalina imperatoria, d'Orbigny ('46), p. 176, pl. 10, 

 figs. 16-18. 



The specimens answer in their salient points to 

 d'Orbigny's description of the species, which, as far as I 

 am aware, has not been found before in the recent 

 condition. D'Orbigny's examples were from the Tertiary 

 of Tarnapol, Galicia, and stated to be rare. 



The Delos tests differ from d'Orbigny's drawings in 

 having the chambers of the last convolution slightly 

 inflated, and more erect. The pores are prominent, and 



