go BULLETIN OF THE LABORATORIES 



ilar Striae diverge spirally and irregular[ly] until intercepted by the 

 former set or by each other. Cast smooth, perforately umbilicate. 

 Average diameter of adult .47 (100); height of last whorl at the aper- 

 ture .26 (55): height of aperture .18 (38); showing the inner whorl 

 impressed into outer ,08 (17); width of aperture .35 (74); depth of 

 notch .22 (47); width of peripheral belt a.t notch .06 (13); separating 

 distance between tip of auriculations and mner whorl .10 (21); num- 

 ber of striae in i-io in. .10 (in young and old) largest seen diameter 

 of -53" Bellerophon galericulatus is c^uite common in the shales four 

 feet below congl. I, 



Bellerophon, sp ? 

 (Plate XII, Fig. 2><^.) 



A species with decided Devonian affinities is illustrated from the 

 nodules at Moors run. It is sufficiently distinct from any of the above 

 species, but we have no time to study its relations with Devonian 

 species. 



Bellerophon perelegans, M. and W. ? 

 (Plate IX, Fig. 30.) 



"Shell small, subglobose ; umbilicus small, aperture transverse, 

 reniform. Back and sides marked by fine, sharply elevated revolving 

 lines, which are about equal to the spaces between them, finer and 

 more closely arranged in the middle than on the sides of the shell. 

 Dorsum marked by a narrow, elevated, revolving band, bounded on 

 either side by a shallow depression. The revolving lines on the band 

 are much finer than those on the body of the shell. Very fine striae 

 of growth cross the revolving striae, giving a finely cancellated appear- 

 ance to the surface. Margin of the peristome nearly straight or with 

 a gentle backward curvature to the shallow central notch." 



Our knowledge of this species is confined to fragments of several 

 individuals with tolerably constant characters. The band, except near 



