;W4 Tin American Geologist. May, 1894 
of this genus only in this Devonian fauna, which marks an 
horizon so clearly defined throughout Europe and in the state 
of New York, gives to Protocalyptrwa at once an important 
value as a geological index. 
DESCRIPTIONS OF THE NEW SPECIES HERE DISCI SSED. 
AUTODETUS BEECHERI. 
Shell a truncated coin': apical cicatrix relatively large, 
usually less than one halt' the diameter of the body whorl. 
Cone gradually and somewhat irregularly expanding. Surface 
without external evidence of sutures and marked with irregu- 
lar concentric growth-lines. 
Dimensions of an average specimen : height, 4 mm.; diame- 
ter of body whorl, H mm.; diameter of cicatrix, 24/ mm. 
Siliceous limestones of the Lower Oriskany, Becraft's moun- 
tain. X. Y. 
(Named for Prof. Charles E. Beeeher, of New Haven.) 
AUTODETUS LINDSTROZMI. 
This species differs from the foregoing in its usually larger 
size, more rapidly expanding shell, and greater difference in 
the relative diameter of cicatrix and body whorl. A full 
grown individual measures, height, 6 mm.; diameter of body 
whorl, 1) mm.; diameter of cicatrix, 24 mm. Hamilton shales. 
Most of the specimens have been obtained from a locally de- 
veloped limestone occurring at Tichenor's, on Canandaigua 
lake; also found in the shales at Hamburgh, N. Y. 
(Named for Dr. (iustav. Lindstrom. of Stockholm.) 
PROTOCALYPTR/EA STYLIOPHILA. 
Shell comparatively large, regularly conical, apex unknown. 
Surface without rugous growth-lines, but marked with ex- 
tremely fine, essentially concentric striae, as in Galyptrata, 
The dextral volutions very faintly perceptible from without. 
Dimensions, restoring the broken apical portion from the 
general slope of the sides: height. 12 mm.; diameter of aper- 
ture, 14 mm. 
Styliola limestone in the Genesee shales ; Genundewah, Can- 
andaigua lake. 
PROTOCALYPTR/EA MARSHALLI. 
Shell small, conical, rapidly expanding. Apical spiral well 
developed for about one and a half volutions, thence lost ex- 
