Glintzboeckel and Magn6 (1955, p. 154) have shown 

 that Globigerinelloides algeriana occurs about 200 meters 

 below an Aptian (Upper Gargasian) ammonite assem- 

 blage and it is regarded by them as a "good guide 

 fossil for the Aptian of North Africa." 



Figured paratype (Cushman Coll. 56790) from green- 

 ish blue marls of Aptian age, Djebel Menaouer, between 

 Relizane and Uzes-le-Duc, western Algeria. Collected 

 by A. ten Dam. 



Range: Aptian. 



STUDIES IN FORAMINIFERA 23 



Genus Planomalina Loeblich and Tappan, 1946 ' 



Plate 1, Figures 2a-3b 



Planomalina Loeblich and Tappan, 1946, Journ Paleontol 

 vol. 20, No. 3, p. 257, 1946. 



Type species: Planomalina apsidostroba Loeblich 

 and Tappan, 1946. Fixed by origmal designation and 

 monotypy. 



Test free, planispiral, biimibilicate, involute to par- 

 tially evolute, lobulate in outline; chambers spherical 

 to ovate to angular rhomboid; sutures radial, straight 

 or curved, elevated or depressed; wall calcareous,finely 

 perforate, radial in structure, surface smooth or orna- 

 mented with nodes and keel; aperture interiomarginal, 

 an equatorial arch, with lateral extensions reaching 

 back at either side to the septum at the base of the 

 chamber, the lateral umbUical portions of successive 

 apertures remaining open as supplementary relict aper- 

 tures after the equatorial portion is covered by the 

 succeeding chambers, these small rehct slits and promi- 

 nent bordering lips giving a characteristic appearance 

 to the umbilical region. 



Remarks: Originally believed to be related to Anom- 

 alina because of the relatively coarsely perforate, 

 planispiral test, Planomalina is now shown to possess 

 lateral relict apertures in addition to the primary 

 interiomarginal equatorial apertm-e, which with the 

 planispiral plan of growth suggests a relationship to 

 such planktonic genera as Hastigerinoides. Another 

 excellently preserved species here described, which lacks 

 the surface ornamentation of the type species, shows 

 even more clearly the relationship to this group. As 

 Planomalina is the most primitive of those with relict 

 apertures it is here made the type genus for the sub- 

 family Planomalininae. 



Planomalina differs from Biglobigerinella LaUcker in 

 having extremely prominent reUct apertures, and in 

 having only a single primary aperture, whereas Biglo- 

 bigerinella develops a paired primary apertm-e, and 

 may have paired final chambers as well. If differs from 

 Globigerinelloides Cushman and ten Dam in lacking 

 the sinuately curved umbilical chamber extensions, and 

 in possessing relict apertures. 



Types and occurrence: Holotype of Planomalina 

 apsidostroba Loeblich and Tappan (Cushman Coll. 

 45667) from the Main Street formation, in a road cut 

 on the south side of the Godley-Cleburne road, just 

 uphill from the bridge across Nolan's River, 4.8 niiles 

 southeast of Godley, locality HTL-102, sample 418, 



' After the present paper had been sent to press, the genus BUictnella SIgal, 

 1956, was described, with Anomalina breegiemls Oandolfl as type species. Biikiiutttt, 

 superficially very similar to PlanovuUina, was defined as a "morphologic genus" 

 related to the TicineUa-ThalmanniJUlla-RotaHpora group in being slightly asymmet- 

 rical, and In having accessory intraumbilical apertures, at the posterior border o( 

 the chambers. In Planomalina the umbilical slits are at the forcward margins o( the 

 chambers and are relict apertures, i. e., the exposed umbilical remnants of the primary 

 aperture. Biticinella thus may be related to Rolalipora of the family Qloborotallldae. 

 IX the supplementary apertures in Biticinella should prove to be relict apertures, 

 however, the genus Biticinella would probably become a synonym of PlaTwrnalina. 



