INDIANA PALEONTOLOGY. 170. 



Near the margin of. the calix, there are numerous small cysts; many of these ap- 

 pearing as short, thick spines; but these spine-like cysts disappear as they ap- 

 proach the bottom of the calix, and are replaced with large, irregular vesicles. 

 The vesicles on the exterior are very irregular in size, but very numerous and 

 shallow, and somewhat long. 



I have one corrallum in my collection that agrees with this in diameter at 

 the calix, and has a more symmetrical form, that measures nineteen inches 

 in length. 



The broad, sliallow, oblique calix, and the numerous thin invaginated spin- 

 ulose cups, make this easily recognized from all other species. 



Found in the Lower Devonian (Corniferous group) at the Falls of the 

 Ohio. Now in the collection of the author. 



CYSTIPHYLLUM CLAVATUM, N. Sp. 



Plate 50. Fig. 2. 



Corallum simple, turbinate, or elongate turbinate or cylindrical, straight or 

 regularly curved. Acute at the base of attachment. Gradually and regularly 

 expanding in diameter to the calix. Height of entire corallum fifteen inches; 

 only seven inches is illustrated. Diameter of corallum at the height of seven 

 inches, sixty-five millimeters; then very slightly enlarging to the calix. Exte- 

 rior very rugged, and has the appearance of being composed of numerous thin 

 invaginated cups. When decorticated, the surface is covered with numerous 

 shallow and somewhat broad cysts. The calix is covered with much larger ves- 

 icles than those on the exterior, and near the margin of the cup fine striir ap- 

 pears more or less on the surface of the cysts. 



The large size and large vesicles in the calix, and fine strii\^ on the surface 

 of those near the margin, and the numerous broad shallow cysts on the exterior, 

 and the appearance of numerous thin invaginated cups, makes this easily rec- 

 ognized from all other species. 



Found in the Lower Devonian (Corniferous group) at the Falls of the Ohio. 

 Now in the collection of the author. 



BAT OCR IN US M A G N I R O 8 T R I S , N. Sp., (Rowley.) 



Plate 51. Fig. 1, 2, 3. 



In this species the ventral disk is deeper than the dorsal cup and the base 

 of the ventral tube is very strong. 



The calyx rapidly expands from the basal plates and forms a low cone. 

 The three basal plates form a distinct rim. The columnar canal is round. 



