Manchester Memoirs, Vol. Ixii. (191 7) 89 



Very rare. Two small specimens consisting of five and 

 seven segments respectively were found in Gatherings 5 and 6, 

 1893. 



(The specimens are small, and by no means well developed 

 even as compared with the original figure of d'Orbigny. The 

 Challenger figures (Chall. Rep. p. 538. pi. CXIV, fig. 15, 16.) 

 though probably referable on general structure to d'Or- 

 bigny's species are very much thinner and have more numerous 

 chambers. They probably represent growth under more 

 favourable conditions of depth.) 



205. Cristellaria tenuis (Bornemann.) 



Marginulina tenuis, Born. 1855, Zeitschr, deutsch. geol. Ges. r 



vol. VII, p. 326. pi. XIII, fig. 14. 

 Cristellaria tenuis, Brady, 1884, Chall. Rep., p. 535, pi. LXVI, 



figs. 21-23. 



This species is very rare in the Biarritz Marl. Only two 

 small specimens being taken from Gathering No. 3 (1893.) 



206. Cristellaria schlonbachi, keuss. 



Cristellaria schlonbachi, Reuss, 1862 (3). Sitz. k. Ak. Wiss. 



Wien, vol. XL VI, (1), p. 65, pi. VI, figs. 14-15. 

 C. schlcenbachi, Brady, 1884, Chall. Rep., p. 539, pi. LXVII, 



Rare in all our Gatherings. 



207. Cristellaria crepidula (Fichtel & Moll.) 



Nautilus crepidula, Fichtel & Moll, 1798, Test. Micr. p. 107, 



pi. XIX, figs. g-i. 

 Cristellaria crepidula, Brady, 1884, Chall. Rep. p. 542, pi. 



LXVII, figs. 17, 19, 20; and pi. LXVIII, figs. 1-2. 



Very rare. One fine specimen found in material collected 

 April, 1897, an d two small ones in April, 1893. 



208. Cristellaria recta, d'Orbigny. 



Cristellaria recta, d'Orbigny, 1840, Mem. Soc. Geol. France, 



[1 ], vol. IV, p. 28, pi. II, figs. 23-25. 



This species which leads from C. crepidula to C. italica 

 through C. acutauricularis and C. triangularis is rare, but per- 

 sistent throughout the Marls. It is represented by single 



