STE. GENEVIEVE MARLS NEAR FORT DODGE 609 



Thomas^^ from, the Devonian of the west and by Price^* from the 

 Pennsylvanian of West Virginia. 



Oocurrence. — Ste, Genevieve, Fella beds, near mouth of Lizard 

 creek, Webster comity, Iowa. 



ECHINODERMS. 



Undetermined Crinoids. 

 Minute fragments of stems not over 1.5 mm. in diameter oc- 

 cur in the clay and in lumps of the marl ; they were first noticed 

 in the clay adhering to uncleaned brachiopod shells. The column- 

 als are thin and are rounded pentagonal in transverse section ; 

 the lumen is scarcely one-tenth of a millimeter across and the 

 joint faces are marked by fine marginal crenellfE. The,y are ap- 

 parently rare. 



Spirorhis fort-dodgensis n. sp. 



WORMS. 



Plate XII, figs. 18, 19. 



Tube right-handed, of one and one-half to two and one-half 

 turns, the last volution being much the largest and covering the 

 earlier ones. Diameter of the adult forms from two to two and 

 one-half millimeters, height about one millimeter. Cross section 

 of the volution som'ewhat oval, mouth slightly upturned, umbili- 

 cus small but w^ell marked. Surface marked by sharp conspicu- 

 ous growth lines which are well separated on the peripliery but 

 which are croAvded in the umbilical region ; there is more or less 

 distinct imbrication of the successive growth increments, each 

 new addition projectiijig a short distance from within the next 

 older; the younger half-grown tubes are smooth. 



These enrolled worm tubies are cemented to the shells of brach- 

 iopods, especially to the shells of Spirifer pellaensis. 



Occurrence. — Ste. Genevieve, Pella beds, along Lizard creek, 

 Webster county, Iowa. 



BRYOZOA. 



Batostamella interstincia Ulrich. 



1890. B at ostomella interstincia Vlvioh, Geol. Surv., 111., vol. VIII, 



pt. ii, p. 434, pi. LXXV, figs. 4-4e. 



Zoarium forming a thin incrustation spread over the shell of 

 Spirifer pellaensis; the incrustation is so thin that the position 



"Bull. Lab. Nat. Hist., State Univ. Icwa, vol. VI, no. 2, pp. 165 160. 

 1911, plate. 



I'^W. Va. Geol. Surv., I-Jaleigh county Rept., part iv, p. 68S, pi. xxx, fis. 1, 

 1916. 



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