Foraminiferal Limestones, 247 



The following foraminifera were observccl in this rock : — 



MilioUna hicomis ? (Walker & Jacob). 



Serpula bieornis, Walker & Jacob, 1798, Adams's Essays, Kanmacher's ed., 



p. 633, pi. xiv, %. 2. 

 MilioUna bieornis (\V. k J.), IJrady, 1884, Eep. Cliall., vol. ix, p. 171, pi. vi, 



figs. 9, 11, 12. 



A transverse section of a specimen closely resembling that of 

 M. bieornis is seen in the slide of No. 550, It is impossible, 

 however, to speak with certainty as to the exact species. 



MilioUna trigonula (Lamarck). 

 Some examples of the above species are present in No. 550. 



Textxdaria rugosa (Rcuss). 

 Several specimens of this species occnr in our slide. 



Carpentaria, near utricularis, Carter. 



Fragments of the tests of Carpeyiteria are rather numerous in 

 No. 550, and those with a distinctly pitted surface probably belong 

 to the above-named species. There are also some fragments with 

 more even surfaces which may belong to C. monticularis, Carter. 



Rotalia schroeteriana?, Parker & Jones. 



A species of Rotalia is common in this rock-specimen, which 

 with some reservation we may ascribe to the above form. 



Grjpsina glohulus (Eeuss). 

 This species occurs here in some numbers and is fairly large. 



Amphistegina lessonii, d'Orbigny. 

 Common in the slides of No. 550. 



Heterostegina depressa, d'Orbigny. 



This species is represented in No. 550 by very large specimens, 

 some of which show a megalospheric commencement. The centre 

 of the disc in these specimens is very thick and often curved, giving 

 rise to sections showing both the vertical and tangential aspects 

 of the shell. 



