﻿Manchester Memoirs, Vol. xlix. (1905), No. 5. 1 1 



*Bulimina elegantissima, d'Orbigny. (PI. 2, fig. 6.) 

 Bulimina elegantissima, d'Orbigny (39), p. 5 1, pi. 7, 



figs. 13, 14. 



B. elegantissima (d'Orb.), Williamson ('58), p. 64, pi. 5. 



figs. 134, 135. 



B. elegantissima (d'Orb.), Millett (:oo), p. 276, pi. 2, 



fig- 4- 



The length of the upright chambers in the last whorl 

 of this form varies considerably. In some cases this 

 whorl crosses the back of the test half-way up, while in 

 others it crosses close to the bottom. Frequent. 



"Bulimina elegantissima, d'Orbigny, var. (PI. 2, figs. 

 7-12, and PL 3, figs. 1, 2.) 



This variety is chiefly remarkable for the great 

 number of paired tests that occur. I have about 50 

 picked out, and they show every stage of growth, viz., 

 from a single chamber up to the adult stage. In the large 

 majority of cases one of the pair is in the adult stage, and 

 the other in one of the stages as shown in the figures. 

 The initial chamber of this variety varies so much that it 

 would be interesting to find out if the forms that pair are 

 in the microspheric and megalospheric condition. As 

 very accurate measurements would have to be taken, 

 entailing a good deal of extra work, this problem must 

 stand over for the present. There is a fine ring of what 

 looks like brown cement encircling the tests, just at their 

 juncture. Mr. J. J. Lister (103, p. 126) illustrates by 

 photography one of these pairs which I sent to him, and 

 states by way of explanation that the process called 

 "Plastogamy" probably accounts for the phenomenon. 

 It seems strange that a test consisting of only one or two 

 chambers, and therefore in an apparently very immature 



