﻿Manchester Memoirs, Vol. xlix. (1905), No. 5. 9 



Spiroplecta, Ehrenberg. 

 Spiroplecta sagittula, Defiance, sp. (PL 2, fig. 4.) 



Textularia sagittula (Defrance), Brady ('84), p. 361, pi. 

 42, fig. 17. 



Spiroplecta sagittula (Defrance), Wright (:02), p. 21 1, 

 pi. 3, %s. A, B, C, D, E. 



Spiroplecta zurighti, Silvestri (103), p. 59. 



Spiroplecta sagittula, Defrance, sp. 

 Longitudinal section of the test. x 50. 



There is no doubt, as the sections prove, that this 

 Delos form is a true Spiroplecta ; whether it is identical 

 with Textularia sagittula, Defrance, seems at present a 

 matter of opinion. 



The subject is discussed by Messrs. Wright and 

 Silvestri in the above references. Only four have been 

 found, and they are apparently all in the megalospheric 

 condition. Very rare. 



