372 



Report of the State Geologist. 



character both genus and species are founded. Sufficient is also known 

 of the shape of the body to permit its recognition from the accompanying 

 description. 



Griphodictya epipiianes, sp. nor. 



Plate lv, Fig. 6. 



Sponge slender, originally subcylindrical or with the tube gently 

 expanding to both extremities, the incurvature of the vertical walls being a 



Figure 8S. Spicules of Griphodictya epiphanes, x266. umbels of different form ; 5, oxyhexaster with the 



arms divided Into three prongs each ; 6, 7, 3, oxyhexasters with the arms of the horizontal axes unmodified and the 

 others variously branched ; 8, oxyhexaster with four prongs on two of the arms and three on the other two, 

 10, simple hexact or pen tact ; 1 1 , fragments of echinate spicules. (J. M. 0. ) 



very broad arc without interruption throughout its extent. The base of the 

 sponge terminates abruptly in a broadly undulated margin by which attach- 

 ment was evidently effected or aided, as in the case of the periloph of Phrag- 



