ZOOLOGY AND BOTANY, MIOEOSCOPYj ETC. 757 



there have been no direct observations on tbe share taken by the cell- 

 nucleus in the secretory activity of the cell, it was of great interest to 

 observe such a case in the regenerative processes of the Polythalamia. 



New Rhizopods.* — Dr. A. Gruber gives an account of new, or as yet 

 imperfectly described, species of Ehizopods found by him in the harbour 

 of Genoa. 



(a) Protomyxa pallida, n. sp. The protoplasm is colourless ; it has a 

 tendency to flow out in thread-like processes, so that the whole is some- 

 times a perfect network. The substance of the nucleus is distributed 

 in such small particles that, during life, they cannot be distinguished 

 from the other granules contained in the protoplasm. 



(&) Various Amoebse — Amoeba Jluida, A. globif er a, inclosmg yellowish 

 globules, and A. flavescens, yellowish in colour, rich in fine granules, 

 unusually fluid, and with many small nuclei of the vesicular type. 



(c) Schultzia diffluens. The fine skin which seems to cover the 

 whole is in reality only a slight thickening of the outer layer, and 

 pseudopodia may be given off at any point. The nucleus consists of a 

 great many very small granules. 



(d) Lieberkuhnia Biitschlii n. sp. This species differs from others of 

 the genus in being larger and in having only one nucleus. The skin is 

 easily seen. At the anterior end there is an opening through which the 

 main pseudopodia stalk is projected. From it there ramify a great many 

 fine pseudopodia, and the skin becomes covered so that it seems as if 

 pseudopodia were given off from the whole circumference. 



(e) Pohjmastix sol Gruber. The nucleus is of the type usual among 

 Flagellates. Fine thread-like processes radiate from the whole cir- 

 cumference and give it the appearance of a Heliozoon, but these 

 processes have a flagellate motion. 



Observations on Parkeria.j — Mr. H. J. Carter has some observa- 

 tions on the organic and inorganic changes of ParJceria, in which he deals 

 with their " transformations" and not with natural structure. There are 

 also some further observations on the nature of the opaque scarlet 

 spherules in Foraminifera. 



Sherborn's Bibliography of the Foraminifera. | — Mr. C. D. Sherborn 

 has published a very useful Bibliography of the Foraminifera founded 

 on previously published Bibliographies, but containing a large amount 

 of original work in the way of enlargement and amendment, and with a 

 number of explanatory notes which much increase the value of the book. 



* Ber. Naturf. Gesell. Freiburg i. B., 1888, pp. 33-40. 



t Ann. and Mag. Nat. Hist., ii. (1888) pp. 45-55 (1 pL). - 



I ' A Bibliography of the Foraminifera Eecent and Fossil, from 1565-1888, with 

 notes explanatory of some of the rare and little-known publications,' vii. and 152 pp. 

 8vo, London, 1888. 



1888. 3 F 



