Weno and Pawpaw Formations 79 



SCAPHITES HILLI Adkins and Winton 

 PI. 2, figs. 1-12 



1920: Scaphites hilli Adkins and Winton, Univ Texas Bull. 1945, p. 37, pi. 7, figs. 3-6. 

 1920: Scaphites hilli Winton and Adkins, Univ. Texas Bull. 1931, p. 21. 

 1920: Scaphites sp. A. Winton and Adkins, ibid., pp. 21, 69. 



I II III IV V VI 



PI. 2, PI. 2, PI. 2, PI. 2, PI. 2, PI. 2, 



Fig. 1 Fig. 4 Fig. 7 Fig. 8 Fig. 12 Fig. 17 

 MEASUREMENTS 



Greatest length 9.6 9.5 13.5 11.0 8.0 7.5 



Greatest thickness 8.2 4.4 7.3 4.8 7.0 6.5 



Diameter of coil 7.8 3.8 6.0 6.5 7.0 6.2 



Length of uncoiled portion .... 5.0 8.0 7.5 .... ...: 



Thickness of last turn 8.2 4.4 4.5 2.6 2.6 3.6 



Thickness of next to last turn 3.6 3.1 1.5- 



Greatest length of umbilicus 1.8 1.2 2.1 2.0 1.6 1.2 



Number of (ventral) ribs per 



centimeter, on coil 20 28 20 26 32 26 



On uncoiled portion 24 26 .30 



HORIZON: Basal half of Pawpaw formation, clay phase. This 

 species has so far not been found outside of Tarrant County, Texas, but 

 it may be expected throughout the extent of the clay phase of the Pawpaw, 

 or farther. 



LOCALITY: Most frequent at the type locality one-fourth mile south 

 of the International and Great Northern Railway bridge across Sycamore 

 Creek, Fort Worth, Texas (locality 714), and one-half mile west of the 

 Glen Garden Country Club, Fort Worth, Texas (locality 723). 



NUMBER OF INDIVIDUALS : About 25 individuals have been found. 

 These are in the Bureau of Economic Geology, Austin, Texas, and Texas 

 Christian University, Fort Worth, Texas. 



TYPE INDIVIDUAL: From locality 714 (described above) : deposited 

 in Walker Museum, Chicago. 



MODE OF PRESERVATION: Type, dark reddish brown hematite; 

 other individuals light reddish yellow limonite; a few scattered pyrite 

 cubes noted. 



DESCRIPTION: This scaphite consists of a coiled portion and an 

 elongate unrolled portion terminating in the aperture, and at their junc- 

 tion there is a prominent dorso-lateral tubercle or geniculation which may 

 be taken as an orienting point in describing the ribs and sutures of this 

 fossil. 



