Plate 7. 



Page. 

 DOLATOCRINUS GRANDIS Miller and Gurley 32 



Figs. 1, 2, 3. Basal, lateral, and tegmenal views of a typical specimen with 

 the most frequent type of surface ornament. It shows the large 

 pentagonal basal funnel; the large iBrj distally angular with two 

 large fixed pinnulars leading from IIBrj partly resting upon it; the 

 position and succession of the fixed pinnules leading from the IIBr 

 to the openings at the margin of the tegmen between the arms; also 

 how the large biserial arm, for a distance of two or more biserial 

 pairs of ossicles, is incorporated in the calyx wall. 



4. Detail of an interray of large specimen having 12 pinnule openings; 



it shows how the openings are formed where the sutures leading 

 from the tegmen ambulacra meet the grooves at the distal end of 

 the fixed pinnules. X2. 



5. Detail of another specimen showing succession of IIBr, and two biserial 



pairs of brachials, and the course of the fixed pinnules leading from 

 ^ them. 



6. A fractured cross section of the calyx, showing the inverted conical 



pit half the depth of the calyx, involving basals and radials. 



7. Specimen \vith very sharp sculpturing, coarse wrinkles and an obtuse 



median ridge; also the basal pit with a section of stem in position. 



8. A variant, with a more distinctly striate ornament; it has in three 



interrays a truncate first interbrachial with another succeeding it, 

 followed by two large pinnulars leading from IIBr,, and in the other 

 two the two large pinnulars resting directly on iBr,, as usual in the 

 species. 



All Onondaga: Louisville area. 

 66 



