67 
Genus, Reticularia McCoy 
Reticularia pseudolineata (Hall) 
1858. Spirifer pseudolineatus Hall, Geol. Surv., Iowa, vol. 1, pt. 2, p. 645, 
PI. 20, fig. 4; Spirifera pseudolineata Hall, 1883, Kept. N.Y. State 
Geol. for 1882, PI. (36), 61, figs. 28-30; Spirifer pseudolineatus ? 
Herrick, 1891, Bull. Geol. Soc. Am., vol. 2, p. 45, PL 1, fig. 18; S. 
pseudolineatus Hall and Clarke, 1894, Int. to Study of Brach., pt. 2, 
PI. 25, fig. 15; Spirifer a pseudolineata Keyes, 1894, Mo. Geol. Surv., 
vol. 5, p. 82; Spirifer pseudolineatus Hall and Clarke, 1895, Pal. 
N.Y. vol. 8, pt. 2, PI. 36, figs. 28-30; Reticularia pseudolineata 
Weller, 1914, State Geol. Surv., 111., Mon. 1, p. 429, PL 74, 
figs. 1-11, Pl. 75, fig. 20. 
Remarks. The Minnewanka specimens are somewhat broader than 
the majority of those from the Keokuk limestone of Keokuk, Iowa, the 
type locality (but have about the same relative breadth as Hall’s type 
specimen) ; they likewise have a relatively shorter hinge-line — about one- 
half the breadth of the shell, whereas in the Keokuk forms it is about 
two-thirds the breadth; in the western form also the brachial valve is 
somewhat more convex, and the dental lamellae are narrower. These 
are, however, minor and normally variable differences. 
Locality and Horizon . Lower Mississippian of Mississippi valley. 
In the Minnewanka region in the Mississippian of sections 2-25 (c), 26 (r), 
27 (R), 29 (c), 30 (?>, 34 (r). 
Reticularia setigera (Hall) 
1858. Spirifer setigerus Hall, Geol. Surv., Iowa, Kept., vol. 1, pt. 2, p. 705, 
Pl. 27, figs. 4 a, b; Spirifera setigera Hall and Whitfield, 1877, TJ.S. 
Geol. Expl. 40th Par., Rept., vol. 4, p. 270, Pl. 5, figs. 17, 18; Reti- 
cularia setigera Waagen, 1883, India Geol. Surv., Mem. Pal. Indica, 
ser. 13, vol. 1, p. 542; Spirifera setigera Hall, 1883, N.Y. State Geol. 
Rept. for 1882, Pl. (36) 61, figs. 26, 27; Spirifer setigerus Hall and 
Clarke, 1895, Pal. N.Y., vol. 8, pt. 2, PL 36, figs. 26, 27; Spirifera 
setigera Keyes, 1895, Missouri Geol. Surv., Rept., vol. 5, p. 83; 
Reticularia setigera Beede, 1906, 13th Ann, Rept., Indiana Geol. 
Surv., p. 1318, Pl. 21, figs. 1, 1 a; Girty, 1911, U.S. Geol. Surv., 
Bull. 439, p. 69, Pl. 8, figs. 6, 6 a; Weller, 1914, State Geol. Surv., 
Illinois, Mon. 1, p. 431, Pl. 74, figs. 12-22; Girty, 1915, U.S. Geol. 
Surv., Bull. 595, p. 32, PL 1, figs. 6, 7. 
Remarks . This species differs from R. pseudolineata principally in 
its proportionately narrower form, its narrower and more strongly developed 
median sinus and fold, and its somewhat broader concentric bands. The 
majority of the Minnewanka specimens have a length of from 20 mm. to 
25 mm., but two fragments from section 3 a-3 are much larger; one has a 
preserved length of 33 mm. and an estimated length of 45 mm. to 50 mm., 
its sinus is narrow, increasing very slightly in width, and the concentric 
bands have a uniform width of 3 mm. The Minnewanka form of this 
