FAMILY 41. ANOMALINIDAE 315 



tural characters allies it more or less closely to Orbulina, and 

 by its spinose condition to the others of the Globorotaliidae. 

 Sherbornina is apparently close to Cycloloculina. 



FAMILY 41. ANOMALINIDAE 



Test free, or attached by the dorsal surface which is typically 

 flattened or concave; chambers arranged in a trochoid manner, 

 at least in the early stages, only those of the last-formed cham- 

 ber visible from the ventral side; wb\\ calcareous, coarsely 

 perforate; aperture in the adult either at the periphery or v^ith 

 an extension on the dorsal side. 



KEY TO THE GENERA 



I. Test nearly symmetrical. 



A. Test more or less involute. 



1. Aperture usually median in the adult, at the base of the 



chamber Anomalina. 



2. A supplementary aperture on the peripheral marg'in. 



Ano7nalinella. 



B. Test little if at all involute, much compressed. 



1. Without a broad keel Planulina. 



2. With a broad, thin keel Laticamnina. 



II. Test strongly plano-convex. 



A. Aperture narrow, along the periphery and inner dorsal edge of 



the chamber Cibicides. 



B. Aperture with a neck and lip. 



1. Irreg-ularly spreading Cibicidella. 



2. Irreg-ularly linear Webbina, 



C. Aperture of several small openings Cydocibicides. 



Subfamily 1. Anomalininae 



Test compressed, nearly symmetrical on the two sides in the 

 adult; aperture peripheral. 



Genus ANOMALINA d'Orbigny, 1826 



Plate 49, figures 11, 12; plate 51, figure 1 



Genotype, by designation, Anomalina ptmctulata d'Orbigny 



Anomalina d'Orbigny, Ann. Sci. Nat., vol. 7, 182G, p. 282. 



Aspidospira Ehrenberg, Boricht. k. preuss. Akad. Wiss. Berlin, 1844, p. 



75 (genotype, by designation, A:;]ii(hfijnra saxipara Ehrenberg). 



