Fresh-water Rhizopod. 259 



on the groimdthat they not only possess, as do the Actino- 

 phryna, a nucleolated nucleus and a contractile vesicle, but 

 also differ, which the Actinophryna do not, from the other 

 Ehizopoda in having no anastomoses between^ and no circu- 

 lation of granular sarcode within their pseudopodia. 



For the anatomy and physiology of the Amoebae, see Auerbach, 

 Zeitschrift fur Wiss. Zoologie, vii., 1855^ p. 'j^6^; Claparede et 

 Lachmann, Etudes sur les Infusoires et les Rhizopodes, vol. i., 



P-4I3- 



For other figures of Amoeba radiosa^ see Auerbach, I. c, Taf. xxi., 

 and for descriptions, p. 400 ; Pritchard's Infusoria, pp. 204, 

 .548. 



For the relationships of the Actinophryna to the Amoebean and 

 the more typical Rhizopoda, see Claparede et Lachmann, I. c, 

 p. 418. 



For the recent Foraminifera of Great Britain, see Professor Wil- 

 liamson's Monograph, published by the Ray Society, 1858. 



For the organization and classification of the Rhizopoda generally, 

 see Carpenter's Introduction to the Study of the Foraminifera, 

 (published by the Ray Society), 1862, pp. 13-17; and for the 

 Rhizopoda of the deep sea, see Carpenter, Royal Society's Pro- 

 ceedings, June, 1869, vol. xviii., p. 114. 



For the sarcodic substance of the Rhizopoda, see Professor Hackel, 

 Zeitschrift fiir Wiss. Zoologie, xv., 1865, p. 342. 



S 2 



