Plate 11. 



Page. 

 DOLATOCRINUS BULBACEUS Miller and Gurley 42 



Fig. 1. Basal \'iew of type. University of Chicago Coll., No. 6083. 



2. Type of D. aspratilis Miller and Gurley. University of Chicago Coll., 



No. 6112. 



3. Lateral view of another specimen, showing typical form and ornament, 



and pinnule openings close to edge of arm bases. 



DOLATOCRINUS ARGUTUS MUIer and Gurley 



4, 5. Basal and lateral views of type. University of Chicago Coll., No. 

 G079. 



DOLATOCRINUS STELLIFER Miller and Gurley 



6. Basal view of the type. University of Chicago Coll., No. 6088. 



7. The type of D. neglectus Miller and Gurley, showing typical surface 



ornament, and basal pit with pentagonal rim. University of Chicago 

 Coll., No. 6091. 



8. Lateral view of same, showing decanter shape. 



DOLATOCRINUS TRIADACTYLUS Barris 



9, 10. Basal and lateral views of two typical specimens from Alpena, 

 Michigan. 



DOLATOCRINUS AMPLUS Miller and Gurley 



11. Basal view of the type, with center broken; has 20 arms. University 



of Chicago Coll., No. 6097. 



12. Lateral view of same, showing characteristic tumid plates, and promi- 



nent pinnule openings. 



13. 14. The type of D. vasculum Miller and Gurley; basal and lateral 



views; 18 arms. University of Chicago Coll., No. 6096. 



15. The type of D. peculiaris Miller and Gurley, with 17 arms. University 



of Chicago Coll., No. 6085. 



16. The type of D. lyoni Wachsmuth and Springer, with 15 arpis. 



17. Detail of interray of same, showing pinnule openings and slits leading 



to them. 



Hamilton: All except figures 9 and 10 from the Louisville area 

 in Clark County, Indiana. 

 70 



