FORAJVIINIFERA OP THE ATLANTIC OCEAN 



103 



Porospira Ehri^nberq, Bericht. k. preuss. Akad. Wiss. Berlin, 1844, p. 75 



(genotype b}'^ designation. Porospira comes Ehrenberg), 

 Rosali7ia (part) of Authops. 

 Rotalia (part) of Authors. 

 Discorhina (part) of Authors. 

 Planorhulina (part) of Authors. 

 Truncaiulina (part) of Authors. 



Genotype, by designation. — Anomalina punctulata d'Orbigny. 



Test in the young, trochoid, in the adult often nearly involute on 

 the dorsal as well as on the ventral side, the chambers added nearly 

 in a planispiral manner, the inner coils of the dorsal side often appear- 

 ing as a central raised boss; wall calcareous, perforate; aperture in 

 the young on the ventral side, in the adult becoming peripheral at 

 the base of the last-formed chamber in the median line, sometimes 

 with a boss of clear material over the umbilical region. 



Lower Cretaceous to Recent. 



The genus Anomalina is not as well characterized as some of the 

 others of d'Orbigny. His original descriptions show that it is related 

 to Cibicides, but may be used for those forms which are more nearly 

 bilaterally symmetrical with the earlier chambers usually showing 

 somewhat from either side, but the test not flattened and spread out 

 as much as in Planulina. 



ANOMALINA EDWARDSIANA (d'Orbigny) 



Plate 19, figure 4 



Rosalina edwardsiana d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba^ 

 1839, "Foraminiferes," p. 106, pi. 6, figs. 8-10. 



Anovialina edwardsiana Cushman, Publ. 311, Carnegie Instit., Washing- 

 ton, 1922, p. 50, pi. 8, figs. 1, 2. 



Test unequally biconvex, the dorsal side flatter than the ventral, 

 periphery slightly lobulated; chambers typically visible on both 

 sides to the center, numerous, eight or nine in the last-formed coil, 

 distinct; sutures distinct, those of the dorsal side more limbate and 

 very slightly depressed, those of the ventral side less limbate but 

 more depressed; wall coarsely perforate; aperture with an elongate, 

 curved slit on the dorsal side of the last-formed chamber extending 

 down the periphery, with a slight overhanging, thin lip. 



Anomalina edwardsiana — Material examined 



2305—31- 



