186 EECENT EESEARCHES ON THE EADIOLA.RIA. 



between Eadiolarian yellow cells and the green cells of the Helio- 

 zoon Acanthocyrtis, deciding that the question cannot be settled 

 till the genesis of both cells is understood ; but that if they are 

 homologues, then the outer ^ivdUl oi AcantJiocyrtis cannot be the 

 homologue of a central capsule.) 



Also Sitzungsb. d. niederrheinischen G-esellsch. Jan. 1871. 



And Sitzungsb. d. Gresellschaft f. Natur. zu Marburg, No. 5, 

 1875. 



Caeefthers, W. British Assoc. Eeports, 1872, p. 126, and 

 Quart. Journ. Microsc. Science, (n. s.) vol. xii. p. 397, 1872. 



(On Tmg-waiWajaE-adiolariau Hhizopod from the Coal-measures.) 



GrEENACHEE. Zeitschr. f. wissen. Zoologie, vol. xix. p. 289. 



(The autbor, a propos of Acanthocyrtis viridis, expresses his 

 opinion that the Heliozoa are a less differentiated branch from 

 a root-stem, from which the Eadiolaria are a more differentiated 

 branch, bearing to the latter a relation similar to that borne by 

 the freshwater Hydra to the marine Hydroid polyps.) 



Heetwig, Dr. E. Morphol. Jahrbuch, vol. ii. p. 63, pi. iii. 

 (In this the author puts forward his views as to the formation of 

 nuclei from so-called nucleoli.) 



HEETwra, Dr. E. Zur Histologic der Eadiolarien. Leipzig, 

 1876. 



(A most excellent treatise on the structure and reproduction of 

 Gollozoum inemie, Thalassicolla nucleata, and Thalassolampe marga- 

 rodeSj with considerations on the relations borne by the Eadiolaria 

 to the other Ehizopods, and the bearing of the facts noted on the 

 cell- theory.) 



ZiTTEL, Kael a. Handbuch der Palaontologie, I. Band, 

 p. 117, 1876. 



(The author notices the fossil Eadiolaria of the Mesozoic 

 strata.) 



ZiTTEL, Karl A. Ueber fossile Eadiolarien der ob. Kreide. 

 Zeitschrift d. deutschen geol. Gres. (1876), Band xxviii. Heft 1. 



Flemming, Prof. Walthee. Archiv f. mikrosk. Anat. vol. 

 xiii. p. 629, pi. xlii., 1877. 



(An elaborate paper, wherein the author takes occasion to 

 criticise and oppose Dr. Hertwig's views as to the nucleus and 

 nucleolus, their multiplication and reproduction.) 



