Plate 31. HETEROHELICIDAE : GUEMBELITRIINAE, HETEROHELICINAE 



Page 

 Figures la,b. Guembelitria cretacea Cushman 136 



la, Side view of holotype (Cushman Coll. 

 19022) from the Navarro formation, Upper 

 Cretaceous, Guadelupe County, Texas, lb, Top 

 view. X 310. 

 Figure 2. ^^Guembelitria" vivans Cushman 136 



2, Holotype (Cushman Coll. 21S1S), showing 

 buliminoid aperture, proving this form not to be 

 related to the Heterohelicidae; from the Recent, 

 Challenger Station 192 A, off Little Ki Island, 

 New Guinea, at 129 fathoms. X 290. 



Figures 3-4c. Guembelitriella graysonensis Tappan 137 



3, Paratype (Cushman Coll. 44713), showing 

 multiple apertures in the final chamber. 4a, 

 Holotype (Cushman Coll. 25098). 4b, Opposite 

 side. 4c, Top view. Both from the Cretaceous 

 Grayson formation (Cenomanian), on Denton 

 Creek, 3/2 miles northeast of Roanoke, Denton 

 County, Texas. Coll. by A. R. Loeblich, Jr., 

 and Helen Tappan Loeblich. X 175. 



Figures 5a-ll. Heterohelix navarroensis Loeblich 137 

 5a, Side view of holotype (USNM P33). 

 5b, Edge view, showing low arched aperture. 

 X 145. 6-11, Paratypes (USNM P37a-f), 

 showing gradation from a large coil of typical 

 Heterohelix type, to a relatively small coil, found 

 in species formerly referred to Guembelina. 

 X 120. All are from the Upper Cretaceous, 

 Navarro group, Kemp clay, (Maestrichtian), pit 

 of Seguin Brick and Tile Co., McQueeny, 

 Guadelupe County, Texas. Coll. by A. R. 

 Loeblich, Jr. 



Figures 12-15. Heterohelix globulosa (Ehrenberg) 137 

 12, 13, Hypotypes (USNM P34a, b), showing 

 microspheric and megalospheric forms of the 

 type species of Guembelina. From the Upper 

 Cretaceous, Navarro group, Kemp clay (Maes- 

 trichtian), in pit of the Seguin Brick and Tile Co., 

 McQueeny, Guadelupe County, Texas. Coll. by 

 A. R. Loeblich, Jr. X 105. 14, Hypotype 

 (USNM 104332) from the Upper Cretaceous, 

 Arkadelphia marl, on Arkansas Highway No. 4, 

 5 miles northwest of Hope, 100 yards east of the 

 airport beacon, Hempstead County, Arkansas. 

 Coll. by W. H. Deaderick. X 90. 15, Hypo- 

 type (Cushman Coll. 31517) from the Upper 

 Cretaceous, Arkadelphia clay, 7 miles N. by W. 

 of Hope, Hempstead County, Arkansas. Align- 

 ment of pores suggests the development of 

 striae. X 90. 



Figure 16. Heterohelix carinata (Cushman) 137 



16, Hypotype (Cushman Coll. 31493), showing 



a microspheric form with early coil, from the 



Upper Cretaceous, Lower Taylor marl, in a 



ditch on the north side of the road to Farmersville, 



268 



9.5 miles east of the McKinney courthouse, Col- 

 lin County, Texas. Coll. by J. A. Cushman and 

 James Waters. X 145. 

 Figure 17. Heterohelix globocarinata (Cushman) 137 



17, Hypotype (Cushman Coll. 31641) from the 

 Upper Cretaceous, upper part of the Taylor 

 marl, on the Paris highway 1.8 miles east of 

 Deport, Red River Co., Texas. Coll. by L. W. 

 Stephenson. Microspheric specimen showing 

 the early coil. X 100. 



Figure 18. Heterohelix reussi (Cushman) 137 



18, Hypotype (Cushman Coll. 24463) from the 

 Upper Cretaceous, middle Brownstov/n, in ditch 

 east of the Commerce-Paris highway, 2.9 miles 

 south of Paris, Lamar County, Texas. Micro- 

 spheric specimen with early coil. X 115. 



Figure 19. Heterohelix lata (Egger) 137 



19, Hypotype (Cushman Coll. 31513) from the 

 Upper Cretaceous, Hopflinger Miihle, Upper 

 Bavaria, showing small early coil, and somewhat 

 elongated chambers. X 125. 



Figure 20. Heterohelix pulchra (Brotzen) 137 



20, Hypotype (Cushman Coll. 24417) of 

 Guembelina pseudotessera Cushman {^H. pul- 

 chra) from the Upper Cretaceous, upper Taylor 

 marl, in road cut near crest of hill, 14.4 miles 

 south of Paris, 0.9 mile north of Lake City, Delta 

 County, Texas. Coll. by C. I. Alexander. Early 

 coil is shown, and the much broadened later 

 chambers, which appear reniform. X 135. 



I'igures 21, 22. Pseudo guembelina costulata (Cush- 139 

 man) 



21, Hypotype (Cushman Coll. 31706), from 

 the Upper Cretaceous, Navarro group, Corsicana 

 marl, from pit near Corsicana, Navarro County, 

 Texas. Megalospheric form, with biserial base, 

 and well developed chamber extensions, and 

 accessory apertures. X 125. 22, Hypotype 

 (Cushman Coll. 31705), from the Upper Creta- 

 ceous, upper Taylor, in a road cut 14.4 miles S. 

 of Paris, 0.9 mile north of Lake City, Delta 

 County, Texas. Coll. by C. L Alexander. Edge 

 view, showing lateral extensions of the arched 

 aperture. X 125. 



Figure 23. Pseudo guembelina excolata (Cushman) 139 

 23, Hypotype (Cushman Coll. 31769) from the 

 Upper Cretaceous, Navarro group, Corsicana 

 marl, from clay pit near Corsicana, Navarro 

 County, Texas, showing the early coil in the 

 microspheric generation. The final chamber of 

 the specimen is broken, obscuring the apertural 

 characters. X 155. 

 Figures 5, 12, and 13 prepared by Helen Tappan Loeblich; 



others by Lawrence and Patricia Isham. 



