i8o 



NEW YORK STATE MUSEUM 



4,5 



PLATE S 



Hydnoceras tuberosum Conrad var. glossema 

 H. & C. A silicious hexactinellid sponge with markings 

 of worm tubes on the inner side of the recticulum. From 

 the Chemung group (Upper Devonic) of southwestern 

 New York 



Another silicious sponge, Prismodictya telumH. & 

 C. with similar worm tubes also from the Chemung group 

 of New York 



The barnacle Lepidocoleus jamesi of the Lower 

 Siluric (Cincinnati group) showing the unatrophied con- 

 dition of the animal whose segmentation may be regarded 

 as represented by the paired valves which meet at the 

 edge allowing room for the protrusion of the appendages 



Palaeocreusia devonica Clarke, a barnacle buried 

 in a colony of Favosites hemisphericus partly 

 by burrowing and partly by overgrowth of the coral. 

 From the Onondaga limestone, Leroy, N. Y, 



