FORAMINIFERA OF THE ATLANTIC OCEAN. 35 



instead of acute, and the aperture is surrounded by a produced lip. Specimens 

 vary accordingly within all the limits usually found in L. quadrata. Wright's 

 figures represent a somewhat long shell with practically parallel sides. The 

 range in shape among the Clare Island specimens extends from almost square 

 tests to the outline of Wright's figure, but we have met with specimens in 

 Goldseeker dredgings in which the shell is very much longer and narrower, 

 re.sembling. in fact, a piece of compressed tubing. 



They also record it from the west of Scotland and off South Corn- 

 wall. It seems to be rare. I have had no specimens from the western 

 Atlantic. 



LAGENA MARGINATA (Walker and Boys). 



Plate 6, fig. 9. 



There are many references to this species in the literature, but if 

 they are examined it will be found that they vary greatly in their 

 characters. The main characteristic seems to be the development of 

 a keel of greater or less extent about a usually subspherical central 

 chamber. If, however, the original figures of Walker and Boys are 

 consulted, it will be found that their figures show a more or less 

 compressed pyriform test, gradually tapering from the somewhat 

 curved apertural end, with a very broad rounded basal portion, and 

 instead of having a thin broad keel, have a rounded narrow marginal 

 carina. Such specimens as this are common about the British Isles 

 and should be taken as the typical form of this widely recorded 

 species. I have not found typical material on the western side of 

 the Atlantic. As there are so many forms quoted under this species, 

 an examination of much of the material which has passed under this 

 name should be made and the various forms discriminated. 



LAGENA MARGINATA (Walker and Boys), var. INAEQUILATERALIS J. Wright. 



Lagena marginata (Walker and Boys), var. inaequilaternlis Wright, Rep. 

 Belfast Nat. Field Club. 1S85-1886, App., p. 321, pi. 26, fig. 10; Proc. 

 Roy. Irish Acad., ser. 3, vol. 1, 1891, p. 481. — Sidebottom, Mem. Proc. 

 Manchester Lit. Philos. Soc, vol. 50, No. 5, 1906, p. 10, pi. 2, fig. 6; 

 vol. 54, No. 16, 1910, p. IS. — Hekon-Allen and Earland, Proc. Roy. 

 Irish Acad., vol. 31, pt. 64, 1913, p. 85; Trans. Linn. Soc. London, ser. 2, 

 vol. 11, 1916, p. 251; Journ. Roy. Micr. Soc, 1916, p. 46. 



Heron-Allen and Earland make the following notes on this va- 

 riety : 



"An occasional specimen found at 6 different stations. Only a few 

 present the characteristics of Wright's variety in a strongly marked 

 manner. When typical this is one of the most distinctive and in- 

 teresting varieties we know. The highly convex surface on one side 

 of the shell, strongly contrasted with the flat surface on tlie other, 

 and the curious aperture situated under a little hood on one side — 



