Plate 2. HANTKENINIDAE: HANTKENININAE 



Page 



Figures la-2. Schackoina cenomana (Schacko) 26 



la, b, Opposite sides of hypotype (USNM 

 P4644a), showing radially elongate chambers 

 and basal portion of the tubulospines, which were 

 broken in preservation. Ic, Edge view, showing 

 low equatorial aperture. 2, Side view of smaller 

 hypotype (USNM P4644b). I'rom the Ccno- 

 manian of Germany. X 230. 



Figures 3a-4b. Hantkenina aragonensis Nuttall 26 



3a, Side view of lectotype (Cushman Coll. 

 59476) of this species, which was designated as 

 type species for the subgenus Aragonella Thal- 

 niann, with radially elongate chambers. 3b, 

 Edge view, showing high arched aperture. 4a, 

 Side view of paratype (Cushman Coll. S9477). 

 4b, Edge view. From the Eocene Aragon forma- 

 tion of Mexico. X 60. 



Figures Sa-6. Hantkenina dumblei Weinzierl and 26 

 Applin 



This species was designated as type for the sub- 

 genus Applinella Thalmann. 5a, Side view of 

 paratype (USNM P4790), showing how greater 

 overlap of succeeding chambers changes the 

 apparent position of the spines. 5b, Edge view 

 showing high arched aperture. 6, Side view of 

 lectotype (Cushman Coll. 12204) with elevated 

 lips of previous apertures showing in the radial 

 elevations paralleling the sutures. From the 

 Eocene Yegua formation of Texas. X 65. 



Figures 7a, b. Hantkenina alabamensis Cushman 26 

 var. primitiva Cushman and Jarvis 



Designated as type species for the subgenus 

 Hantkeninella Bronnimann. 7a, Side view of 

 holotype (Cushman Coll. 10067), showing the 



Page 

 absence of spine on earlier chamber, which was the 

 basis for the subgenus Hantkeninella, but which is 

 a variable character in this and other species. 7b, 

 Edge view, showing high equatorial aperture, 

 with lateral extensions beneath the apcrtural 

 flanges, giving a triradiate appearance. l''r()m 

 the Eocene San Fernando formation, l^iiiiihul, 

 B.W.I. X 35. 



Figures 8a, b. Hantkenina alabamensis Cushman 26 



8a, Side view of hypotype (USNM P4791), 

 showing planispiral biumbilicate test, with spin- 

 ate chambers. 8b, Edge view, showing triradial 

 aperture and lateral apertural flanges. From the 

 Pachuta formation, Jackson Eocene of Alabama. 

 X 35. 



Figures 9a-llb. Cribrohantkenina bermndrzi Thai- 28 

 mann 



9a, 10a, 11a, Side views of hypotypes (USNM 

 P4784a-c), showing typically robust appearance. 

 9b, Edge view, showing early development of 

 supplementary areal aperture of only two open- 

 ings, in addition to the low arched primary interio- 

 marginal equatorial aperture. 10b, Edge view 

 to show complete arched row of pores of the 

 multiple aperture, with lateral remnants of the 

 primary aperture, lib, Edge view, showing 

 multiple areal aperture of 2K rows, with primary 

 aperture completely closed, and supplementary 

 openings also nearly completely obscured by a 

 secondary deposit of shell material. Opening at 

 top of illustration shows where large spine was 

 broken. From the Pachuta formation, Jackson 

 Eocene of Alabama. Fig. 9, X 35; figs. 10, 11. 

 X 65. 



239 



