Manchester Memoirs, Vol. Ixii. (1917) 63 



128A. [Lagena orbignyana, var. selseyensis, Heron-Allen and 



Earland.] 

 [Lagena orbignyana, var. selseyensis, Heron-Allen & Earland, 



1908, etc., SB. 1909, p. 426, pi. XVII, figs. 1, 2.] 



129. Lagena orbignyana, var. walieriana, J. Wright. 



Lagena orbignyana, var. walieriana, J. Wright, 1891, Proc. 

 Roy. Irish Acad., Ser. 3, vol. I, No. 4, p. 481, pi. XX, fig. 

 8a, b. 



Very rare, occurring only in the west beds. The examples 

 found are similar to those collected from the St. Erth clay by 

 Millett, in which the central boss is represented by a small raised 

 ring. 



130. Lagena clathrata, Brady. 



Lagena clathrata, Brady, 1884, Chall. Rep. 485, pi. LX, fig. 4. 



Very rare and small, found only in Gathering No. 1. 



131. Lagena punctata (Seguenza.) 



Fissurina punctata, Seguenza, 1880. Atti. R. Ace. Lincei, (3), 



vol. VI, p. 136, pi. XIII, fig. 1. 

 Lagena mar ginato-p eri orata, Seguenza, 1880, Ibid., p. 332, pi. 



XVII., fig. 34. 



Under the two names given above Seguenza figures two 

 shells which show only trifling differences, and may be brought 

 under the same species. The main difference between the two 

 is that the perforations or pittings in the first are arranged in 

 a regular manner, whilst in the second they are irregularly dis- 

 posed. In his descriptions Seguenza says nothing of the 

 arrangement of the punctations. In describing F. punctata he 

 says that it has a double margin ( ? keel), but the figure does not 

 show this, only presenting that effect which is always seen in 

 sufficiently transparent shells, and which is caused by the inner 

 and outer boundary lines of the shell-wall as seen in optical 

 section. 



The Biarritz specimens are small and very rare. 



(Seguenza's names punctata and mar ginato-p erf orata being 

 of the same date, it would be preferable to adhere to the name 

 which has been more generally used, L. mar ginato-p erf orata , 

 and to abandon L. punctata.) 



