HOLLINELLIDAE 



45 



sabelloid with overlapping notch at each 

 end, channeled in posterior half ; pit circular, 

 slightly forward, above center; surface 

 marked with numerous faint anastomosing 

 or vein-like costae. 



Length, 0.72 mm; height, 0.39 mm; 

 thickness, 0.29 mm. 



Kinkaid formation, locality 28, depth 

 628-33 feet, rare. 



This form does not possess the down- 

 ward shell slope parallel to the posterior 

 margin of the Clore specimen, although it 

 seems to conform in most other respects. 



Family Graphiadactyllidae Kellett 



Genus Graphiadactyllis Roth 



Graphiadactyllis arkansana (Girty) 



Plate 9, figures 9-12 



Kirkbya lindahli var. arkansana Girty, 1910, 

 Ann. New York Acad. Sci., vol. 20, no. 3, 

 pt. 2, p. 234, (no figs.), Fayetteville shale. 



Roundy, 1926, U. S. Geol. Survey, Prof. 



Paper 146, p. 7, figs. 15-16, Barnett shale. 



Graphiodactylus arkansanus. Kellett, 1936, Jour. 

 Paleontology, vol. 10, pp. 773-775. 



Length, 1.31 mm; height, 0.70 mm; 

 thickness, 0.60 mm. 



Fayetteville shale, locality 34, abundant. 



The genotype (figs. 10-12) shows the 

 lack of the anterior spur, the short reticulae, 

 the position of the pit just anterior to mid- 

 length, and the development of a number of 

 small spines on the anterior end. Figure 9, 

 the interior of a right valve, shows the hinge 

 line, the pitted muscle spot, and the arti- 

 culation along the free margins. 



Graphiadactyllis tenuis Cooper, n. sp. 

 Plate 9, figures 7-8 



Bassleria fayettemllensis Harlton, 1929, Am. Jour. 



Sci., ser. 5, vol. 18, p. 256, pi. 1, figs. 2a-c, 



Fayetteville shale. 

 Kirkbya lindahli var. arkansana (part). Roundy, 



1926, U. S. Geol. Survey, Prof. Paper 146, 



p. 7, pi. 1, figs. 14a-c, Barnett shale. 



Carapace subrhomboid, narrowing (in 

 lateral view) perceptibly toward posterior 

 end ; dorsum straight, hinge slightly chan- 

 nelled ; overlap most prominent around ends 

 and venter; surface bears long straight to 

 curved reticulae ; anterior spine-like pro- 

 jection moderately developed ; a short and 

 narrow but prominent posterior spine rises 

 abruptly from antero-dorsal corner; pit or 

 muscle scar just back of mid-length; great- 

 est thickness posterior. 



Length, 1.12 mm; height, 0.63 mm; 

 thickness, 0.50 mm. 



Fayetteville shale, locality 33, common. 



This species differs from the genotype 

 G. arkansana (Girty) in having more 

 elongate reticulae, a prominent posterior 

 spine, and an anterior spur, and the pit 

 located just behind, instead of in front of 

 mid-length. 



Family Hollinellidae Swartz 



Genus Hollinella Coryell 



Hollinella granifera (Ulrich) 



Plate 9, figure 45 



Bollia granifera Ulrich, 1891, Jour. Cincinnati 



Soc. Nat. Hist., vol. 13, p. 205, pi. 12, figs. 



12a, b, Spergen limestone. Batalina, 1924, 



Com. Geol., Bull. 43,, no. 10, p. 1325, pi. 22, 

 figs. 9-12, pi. 23, figs. 18-22. 

 Hollina granifera. Ulrich and Bassler, 1908, Proc. 

 U. S. Nat. Mus., vol. 35, p. 315, pi. 42, figs. 

 16, 17. 

 Hollinella granifera. Bassler and Kellett, 1935, 

 Geol. Soc. Am., Spec. Paper 1, p. 332. 



Length, 1.69 mm; height, 1.01 mm. 



Renault formation, locality 12, common. 



Two specimens from the Renault, 

 although somewhat crushed, agree very 

 closely with Ulrich's figures of the Kentucky 

 Salem species. Little doubt is felt that they 

 are the same because of the unusual features 

 possessed by H. granifera. 



Hollinella longispina 

 (Jones and Kirkby) 

 Plate 9, figures 48-49 

 Beyrichia longispina Jones and Kirkby, 1886, Ann. 

 Mag. Nat. Hist., ser. 5, vol. 18, p. 257, pi. 8, 

 fig. 3, Carboniferous of Great Britain. 

 Hollina longispina. Ulrich and Bassler, 1908, 

 Proc. U. S. Nat. Mus., vol. 35, p. 316.— 

 Latham, 1933, Trans. Roy. Soc. Edinburgh, 

 vol. 57, pt. 2, p. 361, fig. 9, Carboniferous 

 of Great Britain. 

 Hollina steplianovi Batalina, 1924, Com. Geol., 

 Leningrad, Bull. 43, p. 1335, pi. 23, figs. 

 23, 24. 



Length, 1.24 mm; height, 0.77 mm. 



Renault formation, localities 12 and 14, 

 common. 



The Renault specimens agree with Jones 

 and Kirkby's species in the presence of two 

 large spines, one on the postero-ventral 

 margin and the other almost exactly below 

 the large node on the antero-ventral margin ; 

 in the spinose free margins; in the retral 

 swing of the valves, although in the British 

 form this is somewhat more pronounced ; 

 and in the lack of a frill or marginal flange. 



