Plate 13. 



Page. 

 DOLATOCRINUS VENUSTUS Miller and Gurley 50 



Figs. 1, 2, 3. Basal, lateral, and tegmenal Adews of the type. University of 

 Chicago Coll., No. 6094. 



4. A specimen from Alpena, ^Michigan, witli more strictly striate orna- 



ment. 



5. The type of D. aureatus Miller and Gurley, with ornament of more 



isolated pustules. University of Chicago Coll., No. 6082. 



DOLATOCRINUS BELLARUGOSUS Miller and Gurley 50 



6. 7. The type; basal and tegmenal \aews. University of Chicago Coll., 



No. 6087. 

 8, 9, 10. The type of D. coclatus ^Miller and Gurley. University of Chi- 

 cago Coll.. No. G093. 



DOLATOCRINUS EXORNATUS Miller and Gurley 51 



11, 12. Basal and lateral \'iews of one of several specimens of the type of 

 D. dispar ]\Iiller and Gurley, having usually 18 to 20 arms, and 

 of uniformly small size; the type of exornatus is lost. 



DOLATOCRINUS LINEOLATUS Miller and Gurley 



13, 14, 15. The type; basal, lateral, and tegmenal Adews. University of 



Chicago Coll., No. 6080. 

 16, 17. Basal and tegmenal views of the type of I>. ci^tida IMiller and 



Gurley. University of Chicago Coll., No. 6098. 

 18. The type of D. eicosidactylus Wachsmuth and Springer. 



All Hamilton, and all except fig;ire 4 from the Louis\ille area. 

 72 



