442 Thirty-eifth Keport ok the State Museum. 



nating in size, smaller ones short, frequently coalescing with the 

 others, which fasciculate, coalesce and extend to the center and are 

 much twisted, presenting a very irregular appearance ; tabulae large, 

 convex. 



Formation and locality. Corniferous limestone, Canada West. 



Zaphrentis yekusta, n. sp. 



Oorallum simple, turbinate, straight or slightly curved, acute at the 

 base, regularly and quite rapidly expanding to the calix; exterior with 

 concentric wrinkles and undulations of growth; external striae distinct, 

 10 in the space'of 10 mm.; height of corallum 60 mm., diameter of the 

 calix 40 mm., depth 20 mm., sides nearly vertical, walls very thin ; 

 tabulae broad, concave at the center, the outer portion bending down- 

 ward, the intermediate space convex; fossette sinistral, narrow, not 

 conspicuous ; number of lamellae 1 08, thin, of nearly uniform thickness, 

 alternating in length, the principal ones extending nearly to the 

 center, leaving a small oval concave space about 6 mm. in length. 



Formation and locality. Corniferous limestone, Falls of the Ohio. 



G-ekus Elasmophyllum, nov. gen. 

 Corallum simple, turbinate, lamellae extending to the center, twisted 

 or not, interlamellar cysts continuing to the center ; no tabulae. 



Elasmophyllum attekuatum, n. sp. 



Corallum simple, elongate turbinate, straight or very slightly curved, 

 height 130 mm., acute at the base, regularly expanding to calix ; ex- 

 terior with numerous fine, distinct, concentric striae and annulations, 

 external striae conspicuous; when decorticated the internal striae are very 

 obscure; number of lamellae about 60, alternating in size, the principal 

 ones extending to the center and twisted ; no tabulae ; the vesicles 

 between the lamellae numerous and extending to the center ; the .sides 

 of the lamellae with conspicuous longitudinal striae. Several individuals 

 of this species have been observed, but the calix of each is imperfect so 

 that its true form cannot be ascertained, but the species is easily 

 distinguished by its straight or nearly straight regularly expanding 

 form, the strong lamellae, the vesicles extending to the center and the 

 absence of tabulae. 



Formation and locality. Corniferous limestone, New York and 

 Canada. 



CYATHOPHYLLUM, G-oldfuss. 



Cyathophyllum (Elasmophyllum) intervesiculum, n. sp. 

 Corallum simple, elongate turbinate or sub-cylindrical, exterior with 

 numerous narrow annulations and constrictions ; external striae very 



