392 CARBONIFEROUS FORMATIONS AND FAUNAS OF COLORADO. 



The dental liunelliv are often not quite parallel, ivs they arc described by McCoy in 

 Heticularia, but this difference \ can not regard as of prime importance. The type 

 of Reticidaria, as alread_y pointed out b}^ Hall and Clarke, will have to be taken as 

 H. imh'ieata Sowerby, the first species included by McCoj' under his genus. 



Squmnularia and Reticnlarla stand related to one another very much as do 

 Martinia and Martiniopsis, but with this difference, that while the Meticularise with 

 internal plates precede those without, the Martinias with internal structures were a 

 late development. 



Hall and Clarice, as already' mentioned, do not apparentlj' give Meticularia the 

 place of even a subgenus, while Waagen allows it full generic rank. It seems to 

 me that the names Martvnia, Ma/rtiniopsis, Reticularia, and Squamularia stand about 

 on a par in genetic station, and while I am in doubt about their value as full generic 

 groups, it seems to me that they should at least be considered subgenera of Sjjirifer. 



Squamxtlaeia perplexa McChesney. 



PI. VI, figs. 8, 8a, 9 to 9b, 10, 10a, 11 to lie. 



1855. Spirifer lineatus. Shumard, Missouri, Geol. Surv., p. 216. (Not iSp. lineaius Martin.) 

 Coal Measures. 



1856. Spirifer lineaius. Hall, Pacific Railroad Rept., vol. 3, p. 101, pi. 2, figs. 6-8. (Not Sjj. lineatus 



Martin, 1809.) 

 Carboniferous: Pecos Village, N. Hex. 



1858. Spirifer lineaius. Marcou, Geol. North America, p. 50, pi. 7. figs. 5-5c. (Not Sp. lineatus 



Martin. ) 

 Mountain limestone: Pecos Village and Tigeras, N. Max. 



1859. Spirifer lineatus. Meek and Hayden, Acad. Nat. Sci. Philadelphia, Proc, p. 28. 



Upper Coal Measures: Leavenworth, Kans. 



1860. Spirifer perplexa. McChesney, Desc. New Pal. Foss. , p. 43. 



Upper Coal Measures: Almost every jiart of the country where rocks of that age occur. 



1861. Spirifer lineatus. Newberry, Ives's Colorado River Expl. Exped., p. 127. (Not Sp. lineatus 



Martin.) 



Upper Carboniferous: Cherty limestone west of Little Colorado River; vicinity of Santa Fe, 

 N. Mex. 

 ? 1864. Spirifer lineatus. Meek, Pal. California, vol. 1, p. 13, pi. 2, figs. 6-6d. 



Carboniferous: Bass's Ranch, Shasta County, Cal. 

 1866. Spirifer lineatus. Swallow, Acad. Sci. St. Louis, Trans., vol. 2, p. 408. (Not»^. lineatus Martin.) 



Coal Measures: Mississippi Valley. 

 1866. Spirifer lineatus var. perplexa. Swallow, Acad. Sci. St. Louis, Trans., vol. 2, p. 408. 



Coal Measures: Mississippi Valley. 

 1866. Spirifer lineatus var. striato-Unealus. Swallow, Acad. Sci. St. Louis, Trans., vol. 2. p. 408. 



Upper and Middle Coal Measures: Missouri. 

 1872. Spirifer lineatus f Meek, U. S. Geol. Surv. Nebraska, pi. 2, figs. 3a, 6. 



Upper Coal Measures: Platte River, Nebraska. 



