102 BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



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 chamber 

 visible from the ventral side; wall calcareous, coarsely perforate; 

 aperture in the adult either at the periphery or with an extension on 

 the dorsal side. 



In this family which has been derived from the Rotaliidae, the 

 aperture appears first in the median line with the bilateral test of 

 Anomalina, then as the test becomes plano-convex and attached by 

 the dorsal surface, the aperture swings over to the dorsal side. In 

 Cyclocibicides and Cibicidella, genera of the Mediterranean especially, 

 there is an added structure, annular in one and irregular with flask- 

 shaped chambers in the other. Webbina is probably a degenerate 

 genus belonging here. From this family came the attached forms 

 placed in the families Homotremidae and Rupertiidae bj^ the develop- 

 ment at right angles to the area of the attachment. 



KEY TO THE GENERA 



1. Test nearly symmetrical 



A. Test more or less involute. 



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



ber Anomalina 



2. A supplementary aperture on the peripheral margin. .Anomalinella 



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



1. Without a broad keel Planulina 



2. With a broad, thin keel latioarinina 



II. Test strongly plano-convex. 



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



chamber. 



1. Test close coiled throughout Cibicides 



2. Test becoming biserial Dyocibicides 



B. Aperture with a neck and lip. 



1 . Irregularly spreading Cibicidella 



2. Irregularly linear Webbina 



C. Aperture of several small openings Cyclocibicides 



Subfamily 1. Anomalininae 



Test compressed, nearly symmetrical on the two sides in the adult; 

 aperture peripheral. 



Genus ANOMALINA d'Orbigny, 1826 



Anomalina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 282. — H. B. Brady, 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 671. — Chapman, The 

 Foraminifera, 1902, p. 220.- — Cushman, Special Publ. No. 1, Cushman Lab. 

 Foram. Res., 1928, p. 315. 



Aspidospira Ehrenbehg, Bericht. k. preuss. Akad. Wiss. Berlin, 1844, p. 75 

 (genotype by designation, Aspidospira saxipara Ehrenberg). 



