Manchester Memoirs, Vol. Ixii. (19 17) S3. 



regularity of growth and shell texture, and the latter in its 

 depressed transverse section and sinuous sutures, and differs 

 from both in its greater breadth. It is rather rare but widely 

 distributed in our gatherings, having been found in them all 

 excepting No. 1, 1893. 



(This little form appears to us to be nearer to B. textil- 

 arioides, Reuss, than to B. linibata.) 



98. BOLIVINA DILATATA, ReUSS. 



Bolivina dilatata, Reuss, 1850, Denkschr. k. Ak. Wiss. Wien, 



vol.1, p. 381, pi. XLVIII, fig. 15. 

 B. dilatata, Brady, 1884, Chall. Rep., p. 418, pi. LII, figs. 20, 21. 



Frequent and persistent. Specimens finest at the top of 

 the beds, gradually weakening towards the base. 



(All the specimens are of an elongate type approaching 

 B. cenariensis .) 



99. Bolivina beyrichi, Reuss. 



Bolivina beyrichi, Reuss, 1851, Zeitschr. deutsch. geol. Ges., 



Ill, p. 83, pi. VI, fig. 51. 

 B. beyrichi, Brady, 1884, Chall. Rep., p. 422, pi. LIII, fig. 1. 



Rare and small, approaching B. dilatata in having long 

 narrow segments, and very much compressed. Its variety 

 alata, Seguenza, occurs frequently in Gathering No. 1. and is 

 still nearer B. dilatata in the form and setting-on of the cham- 

 bers, though easily distinguishable by its carinate and pectinate 

 margins. Neither form is found in the lower marls. 



100. Bolivina plicata, d'Orbigny. 



Bolivina pit cata, d'Orbigny, 1839, Voyage Amer. Merid. vol. V 

 (5), "Foraminiferes," p. 62, pi. VIII, figs. 4-7. 



B. plicata, Brady, 1870, Ann. Mag. Nat. Hist., (4), vol. VI, 

 p. 302, pi. XII, fig. 7a, b. 



Frequent, small but typical, and well preserved. Wanting 

 in Gatherings 5 and 6. 



101. Bolivina reticulata, Hantken. 



Bolivina reticulata, Hantken, 1875, Mitth. Jahrb. k. ungar. 



geol. Anst., vol. IV, pt. I, p. 65, pi. XV, fig. 6. 

 B. reticulata, Brady, 1884, Chall. Rep., p. 426, pi. LIII, figs.. 



30, 3i- 



