JOURNAL 



OF THE 



ROYAL MICROSCOPICAL SOCIETY, 



FEBRUARY^ 1!)!:;. 



TRA^fSACTIONS OF THE SOCIETY. 



I. — On some Foraminifera from the North Sea, etc., dredged hy the 

 Fisheries Cruiser, ' Goldseeker ' (Fnternational North Sea 

 Investigations — Scotland). II. On the Distribution of Sac- 

 cammina sphasrica (M. Sars) and Psammosphmra fusca 

 (Schtdze) in the North Sea : particnlarly with reference to 

 the suggested identit// of the two species.* 



By Edward Heron-Allen, F.L.S., F.G.S., F.R.M.S., 

 and Arthur Earland, F.R.M.S. 



{Read November 20, 1912.) 



Plates I, II, III, IV. 



The two Ehizopods, which form the subject of this paper, are 

 members of the family Astrorhizid?e and of the sub-family 

 Saccammininge in the classification proposed by the late H. B. 

 Brady, and were both originally described from specimens dredged 

 in the North Sea ; both are, however, very widely distributed and 



* Some portions of this paper were read by the authors before Section D 

 (Zoology) of the British Association at Dundee, in September, 1912, and an 

 abstract of those portions will appear in due course in the Proceedings of the 

 British Association. The paper is here presented in extenso. 



EXPLANATION OF PLATE I. 



Pigs. 1-12. — Saccammina sphaerica M. Sars. Successive stages of growth, from the 

 earliest observed form to the adult test. 

 „ 13, 14. — Irregular type, incorporating large sand-grains, etc., in the test. ^ 

 „ 15. — Faroe Channel type, utilizing sponge spicules as building material, 



viewed as a transparent object (balsam mount). 

 „ 16-19. — Faroe Channel type (opaque). 



Figs. 1-14 magnified 35 diam. Figs. 15-19 magnified 50 diam. 



Feb. 19th, 1913 B 



