102 



NEW YORK STATE MUSEUM 



Measurements. Length of type-specimen 73 mm; width 25 mm; 

 diameter of radial systems of furrows 15 mm; width of paragasters 

 I mm. 



Horizon and locality. Black calcareous shale at Rockwell's, Isle 

 La Motte, Vermont; of Trenton age and most probably referable 

 to the Canajoharie shale. 



-t^ig. 52 

 Fig. 52 Dystactospongia radicosa nov. Natural size. 



Remarks. The type specimen was collected by the late Prof. H. 

 M. Seeley of Middleburg, Vt., and sent by him to the United States 

 National Museum (no. 15242). The single striking feature of the 

 imperfect fossil is the groups of radiating surface canals (apor- 

 rhysa), that surround the paragasters, of which three may be 



