488 



Having examined thousands (I may say myriads) of these elegant 

 organisms, I am induced to suggest the following arrangement : 



1. Lagena (Walker) and Entosolenia (Williamson). 



2. Nodosaria and Marginulina (D'Orb.), &c. 



3. Vorticialis (D'Orb.), Rotalia (Lam.), Lobatula (Flem.), Globi- 

 gerina (D'Orb.), &c. 



4. Textularia (Defrance), Uvigerina (D'Orb.), &c. 



5. Miliola (Lam.), Biloculina (D'Orb.), &c. 



This division must, however, be modified by a more extended and 

 cosmopolitan view of the subject, as I only profess to treat of the 

 British species. To illustrate MacLeay's theory of a quinary and 

 circular arrangement, the case may be put thus. 



Lagenadae. 



1 "^ 



I 



^ 9 tO $. 



$ % 



\: & 



The first family is connected by the typical genus Lagena with 

 the second, and by Entosolina with the fifth ; the second is united 

 with the third through Marginulina ; the third with the fourth 

 through Globigerina ; and the fourth with the last through Uvige- 

 rina. 



Whether these singular and little-known animals are Rhizopodes, 

 or belong to the Amoeba, remains yet to be satisfactorily made out. 



London, June 18, 1855. 



XVI. " Preliminary Research on the Magnetism developed in 

 Iron Bars by Electrical Currents." By J. P. JOULE, F.R.S. 

 Received June 21, 1855. 



The author had, many years ago, found that the magnetism deve- 

 loped by electro-magnetic coils in bars of upward of ird of an inch 



