36 ME. J. A. DOUGLAS 0!tf GEOLOGICAL SECTIONS [April IQ 1 4,. 



of Kansas City and Winterset. 1 A form (which also appears to be- 

 an Enteletes) was figured by A. d'Orbigny 2 from Yarbichambi, 

 Bolivia, under the name of Terebratula andii, which Waagen com- 

 pares with his Enteletes ferruginea. This shell differs from the 

 form here described in the much greater plication of the valves, 

 the folds being apparently continuous to the beak. 



Another Bolivian example, from the same locality, which may 

 probably be referred here, is that figured by Salter 3 from Forbes's 

 collection under the name of Ortliis resnpinata; the drawing appears 

 to represent a ventral view. Dr. E. Schellwien has suggested 1 

 that the earliest Enteletes were strongly plicated, while the late- 

 Permian forms belong to a retrograde series with smooth or faintly 

 plicated shells, though this does not seem to be the case in Waagen's 

 strongly-folded specimens from the Salt Range. There seems,, 

 however, to be no definite reason for assigning a faintly-plicated form 

 to a Permian horizon, as it is natural to suppose that, in the successive- 

 stages of its development, the genus attained a strongly-folded 

 shell after passing through the intermediate stages from a normal 

 Schizophoria. 



Dr. Gr. H. Girty 5 records a number of species belonging to this- 

 genus, of which the fonns most nearly related to ours come from 

 the Hueco formation, apparently equivalent in age to the Uralian. 

 of Chernvshev. 



Euphemtjs cf. ikdictts Waagen. (PL VIII, fig. 5.) 



This genus is one of the subdivisions of the family of" 

 Heller ophon, being characterized by a more or less globular or 

 lenticular shell possessing rounded whorls without an umbilicus. 

 The shell is thick, and covered by a variable number of spiral folds 

 or ridges : these do not adhere firmly to it, but appear to belong to 

 the callosity of the inner iip, being deposited on the preceding- 

 whorl by the lobe of the mantle after the manner of columellar 

 folds. These ridges never reach as far as the outer lip of the 

 aperture, thus leaving a portion of the shell smooth. The aperture 

 is never expanded, and the dorsal slit-band is absent or but 

 slightly indicated. 



The genus first appears in the Silurian rocks, and attains its 

 maximum above the Carboniferous. 



Waagen, in describing a number of species from the Productus- 

 Limestone of the Salt Range, 6 divides them into two groups : — 



1 ' Nat. Hist. N. Y. : Palaeontology ' vol. viii, pt. 1 (1892) pi. viia, figs. 44-52.. 



2 ' Voyage dans TAmerique Meridionale : Paleontologie ' 1842, p. 45 & pi. iii. 

 figs. 14-15. 



3 Q. J. G. S. vol. xvii (1861) pi. iv, fig. 3. 



4 ' Die Fauna der Trogkofelschichten ' Abhandl. K. k. Geol. Keichsanst. 

 vol. xvi, pt. 1 (1900) p. 4. 



B 'The Guadalupian Fauna ' Prof. Paper 58, U.S. Geol. Surv. 1908, p. 290 & 

 pi. xxvi, figs. l—4>b. 



6 Pal. Indica, ser. 13, vol. i (1887) p. 165. 



