GRAPTOLITES. 147 
Stipes varying in proportions, the length being from three to five times 
the width ; axis very distinct, undulating, and its continuation traced from 
the radicle to the distal extremity, beyond which it extends in a mucronate 
point. Cell-partitions distinct, alternating, essentially rectangular to the 
axis, the cellules having their greatest development about the middle of 
the length of the stipe. Margins of the stipe ornamented by short 
mucronate points which alternate with the cell-partitions. 
Surface of the test smooth or granulose. 
EXPLANATION OF Figure or ReTeoGraPtus HucHARIS, Hall. 
Puate XIV. 
Fig. 9. The frond three times enlarged. 
Pormation and Locality.—Utica slate ; Blue Point, Lake St. John. 
