FORAMINIFERA OF THE ATLANTIC OCEAN. 13 



LAGENA CURVILINEATA Balkwill and Wright. 



IMate 2, figs. 5-9. 



Lagena curviUncata Balkwill and Weight, Proc. Roy. Irish Acad., ser. 

 2, vol. 3, 1882, p. 548; Trans. Roy. Irish Acad., vol. 28, 1885, p. 338, 

 pi. 14, figs. 21-24.— H. B. Brady, Journ. Roy. Micr. Soc, 1887, p. 902.— 

 MiLLETT, Journ. Roy. Micr. Soc, 1901, p. 488, pi. 8, fig. 5. — Balkwill 

 and MiLLETT, Rec. Foram. Galway, 1908, p. 5. — Heron-Allen and 

 Earland, Proc. Roy. Irish Acad., vol. 31, pt. 64, 1913, p. 78, pi. 6, 

 fig. 7. 



Description. — " Flask-shaped, surface ornamented with fine curvi- 

 linear striae. In typical examples the striae commence from centres 

 situated at opposite sides of the shell, round which they are twisted 

 in the most beautifully regular manner. In some specimens the 

 striae cross, giving the shell a decussated appearance." 



Distribution. — This beautifully ornamented species, except for the 

 one reference of Millett, seems to be limited to the region of the 

 British Isles. I have found no nuiterial from the Albatross western 

 Atlantic collections. 



LAGENA CYMBULA Heron-Allen and Earland. 



Plate 3, fig. 1. 



Lagena cymhula Hebon-Allen and Earland, Proc. Roy. Irish Acad., vol. 31, 

 pt. G4, 1913, p. 90, pi. 7, figs. 16-18. 



Description. — " Test oval, depressed, shaped like a punt with 

 rounded ends, the superior face concave, the inferior convex. Aper- 

 ture situated in the centre of the depression and furnished with an 

 entosolenian tube, which is attached to the interior of the shell, and 

 follows the outline of the shell up the sloping side of the central 

 depression, passing across to the edge and so down the side of the 

 'punt' to the middle of the base. In transverse section L. cymhula 

 would resemble an inverted triangle of which the basal angles have 

 been rounded off and the inferior or apical portion truncated. 



"Length, 0.13-0.16 mm.; breadth, 0.05-0.08 mm.; depth, 0.03-0.04 

 mm. ; oval central depression averages 0.02 by 0.04 mm. ; tube about 

 0.01 diameter. 



"The affinities of this curious little species lie about midway 

 between L. cymbaeformis Millett, which has a test of somewhat simi- 

 lar outline, but is more regularly naviculoid, being sub-acute at both 

 extremities and sloping to a broad keel beneath, and L. depressa 

 Chaster, which is more circular than our species, and is of the same 

 breadth on both the oral and the aboral sides. The three species 

 form a very interesting and unique little group, characterized by 

 the presence of the apertui-e in what would in a normal Lagena 

 represent the middle of one lateral surface of the test. 



