Plate J 2. 



Page. 

 DOLATOCRINUS COSTATUS Wood 48 



Figs. ], 2. Basal and lateral views of a rather small specimen showing the 

 tumid, wrinkled cup plates, smooth tegmen, and prominent 

 pinnule openings. 

 3. A very large specimen, with extremely rugose plates in basal jiortion, 

 not well shown in the ligure. 



DOLATOCRINUS ASTERIAS Wood 



4, 5. Basal and lateral views of medium sized si")ecimen. 

 G. 7. Variants above the usual size. 



DOLATOCRINUS INCISUS, new species 49 



8, 9, 10. Basal, lateral, and tegmenal views of a maximimi specimen, 

 showing the sharply incised striate or wrinkled ornament, 

 rugose tegmen, basal pit with pentagonal rim, and 20 arms. 



11, 12. Basal and tegmenal views of a smaller specimen with coarser 

 striae. 



13. Another specimen with simjiler lines of ornament. 



DOLATOCRINUS AMPLUS Miller and Gurley 47 



14. Specimen from Louisville, with nodose plates and prominent pinnule 



openings, for comparison with rostatus. 



15. Base of another specimen, with sculpturing of plates very distinct. 



All Hamilton, and from Alpena, Michigan, except figs. 14 

 and 15. 



71 



