IOO NEW YORK STATE MUSEUM 



of the whorls bearing reflected concentric lines. The species comes very 

 close to Kayser's M u r c h i s o n i a 1 o s s e n i [Fauna des Hauptquartzites, 

 p. 15, pi. 8, fig. 9] from the Spiriferensandstein of the Hartz and the 

 Coblentzian of the Rhine. While approaching this form most closely it is 

 also allied to the M. angulata Phillips van a, MVK [Fossils Older 

 Deposits Rhenish Provinces, pi. 32, fig. 7] from the Stringocephalus lime- 

 stone of the Rhine. Attention may also be directed to the shell identified 

 by Verneuil from the Lower Devonic of Nishnij-Tagilsk in the Urals 

 [Geol. de la Russie, 1845, v - 2 > P-339> P^ 22 > fig- ?] under the name of 

 M. cingulata Hisinger. Kayser remarks that this is not Hisinger's 

 species, which is confined to the Swedish Upper Siluric. The forms 

 described by Billings from the Gaspe limestone as M. hebe and M. 

 e g r e g i a are of the same type but are stouter shells with more convex 

 volutions. The Holopellaobsoleta of Sowerby figured by Mur- 

 chison among the fossils of the Tilestones may be of similar type but it is 

 known in literature only from internal casts which serve but a faulty 

 purpose in the determination of such shells. 



Locality. Presque Isle stream. Abundant also at Dalhousie, N. B. 



Eotomaria hitchcocki Clarke 



Plate 23, figures 11-19 

 See p. 139 



Eotomaria hitchcocki Clarke. N. Y. State Mus. Bui. 107. 1907. p. 190 



Shell with rather low, somewhat concave spiral of four to five whorls, 

 the spire usually much depressed when in the shales. The surface of the 

 whorls is regularly sloping, very slightly concave, giving an almost uninter- 

 rupted slope to the spire. Periphery of body whorl sharply carinate or 

 even extended into a keel or flange which seems to carry a slit band. 

 Aperture sharply angulated exteriorly, subcircular in outline, thickened 

 and slightly excavate on the inner lip. Base of shell broad and nearly flat 

 for its full width. Fine concentric growth lines are the only sculpture. It 

 is possible that this shell may be of similar character to the Trochus ? 

 h el i cites Sowerby from the Tilestones of Horeb Chapel [sec Silurta, 

 pi. 34, fig. 12] but comparison can be based only on the resemblance of the 

 internal casts of the two shells for of the exterior of the latter we have as 

 yet no definite knowledge. It is instructive to observe that the Spiriferen- 

 sandstein of the Oberharz (Bocksberg) carries an Eotomaria of similar 

 style with extended peripheral flange [P 1 e u r o t o mari a kleini Beu- 

 shausen, Bcitr. zur Kenntn. d. Oberharz. Spiriferensandst. 1884. pi. i, 

 fig. 10], though a shell of much larger type than that here described. 



Locality. Presque Isle stream and in the Burnt lands 2 miles west. 



Specific name. Prof. C. H. Hitchcock, State Geologist of Maine, New 

 Hampshire and Vermont. 



