J20 BULLETIN OF THE LABORATORIES 



3ike wing to the head. The occipital furrow continues along the pos- 

 terior margin of the fixed cheek as a deep furrow, but vanishes soon 

 after the movable cheek. The pleurae are about three-fourths as wide 

 as the axial lobe. The entire surface is covered with low granules, 

 none of which reach any great prominence. The specimen figured 

 ^\^as collected from the upper portion of the Cincinnati Group in Cler- 

 mont county, Ohio, by Mr. Clinton Cowen, who kindly presented it to 

 me. 



Lichas breviceps as identified from the Clinton Group of Ohio, 

 shows similar structure of the glabella, but the occipital lobes are 

 small and produce no marked effect upon the outline of the fixed 

 ■cheeks. The palpebral lobes are also narrower. In the Waldron 

 type we have failed to discern the occipital lobes and if present at all 

 they must be very small. The palpebral lobes are however very prom- 

 inent as in the Lower Silurian form. The movable cheek is very dif- 

 ferent as may be seen in an outline drawing introduced into the plate 

 for the purpose of comparison. 



UPPER SILURIAN— AMERICA. 



Strom BODES pygm^us, Roinifjger. 



{Plate XIII, Fig. i8.) 



In the Dayton limestone of Ohio, Mr. Van Cleve found a fossil 

 which he labeled as Sarcinula oi'ganiim, Lamarck. This is a form re- 

 sembling Rominger's species above cited in apparently every particu- 

 lar except in the character of the elevations into which the pits of the 

 ■calyces are sunk. These are somewhat more prominent than the fig- 

 ure accompanying the original description would lead one to suspect ; 

 but the difference is not so great that our specimens might not readily 

 be a slight variation from the type. The interior of the pits is 2 mm. 

 in diameter. The elevations are referred to series in one direction 

 more readily than in any other, but still there is considerable variation 

 in the distance between any two elevations. Six millimeters is the av- 

 ■erage distance, but this varies rapidly in different parts of the same 

 specimen from 4 to 10 mm. The elevation of even the most promi- 

 nent malliform cones does not exceed 2 mm. It is noticed that the 



