g6 Halkyard, Fossil Foraminifera of the Blue Marl 



(Halkyard's specimens do not resemble Giimbel's figure 

 exactly, being more compressed and less strongly decorated. 

 C. asperula, Giimbel, like its allies Marginulina fragraria 

 Giimbel and C . cumulicostata, Giimbel, (all figured on the same 

 plate) are usually regarded as mere synonyms of C. wetherellii, 

 and it is almost impossible to separate them. But at Biarritz 

 (fide Halkyard) there are no intermediates between the short 

 and broad form which he assigns to C. wetherellii and the 

 elongate form for which fragraria would be a better type than 

 asperula.) 



228. Cristellaria cumulicostata, Giimbel. 



Cristellaria cumulicostata, Giimbel, 1868 (70), Abh. m.-ph. CI. k. 



ba>er, Ak. Wiss., vol. X, p. 638, pi. 1, fig. 67a, b. 



Very rare. Only found in Gathering No. 8 (1893). It is 

 allied to C. wetherellii, but differs in having the sutures marked 

 by a continuous limbation instead of the tubercles and spines 

 which in the latter species have a tendency to form longitudinal 

 ribs on the surface of the test. 



(To attempt to separate species on such trifling grounds, 

 especially in such an extremely variable group, is in our opinion 

 most undesirable.) 



SUB-FAMILY POLYMORPHININ^E. 



Genus Polymorphina, d'Orbigny. 

 229. Polymorphina gibba, d'Orbigny. 



Polymorphina (Globulina) gibba, d'Orbigny, 1826, Ann. Sci. 



Nat., vol. VII. p- 266, No. 20; Modele. No. 63. 

 Polymorphina gibba, Brady, 1884, Chall. Rep., vol. IX, p. 561, 

 'pi. LXXI, fig. 12a, b. 



Frequent; found in most Gatherings. A few small fistu- 

 lose examples occur in Gathering No. 5, (1893.) 



230. Polymorphina lactea (Walker & Jacob.) 



Serpula lactea, Walker & Jacob, 1898, Adams' Essays Mic/o., 

 (Kannmacher's edition), p. 634, pi. XIV, fig. 4. 



Polymorphina lactea, Brady, 1884, Chall. Rep., vol. IX, p. 559, 

 pi. LXXI, fig. 11, var. fig. 14. 

 This species is more rare than the last named, but is also 



widely distributed throughout the Marl beds. 



