Beede.] Carboniferous Invertebrates. 45 



''This species is so different from any other referred to this 

 genus, that no comparison will servo further to distinguish it. 

 There is a possibility that it is a Zeacrinus, but we think it is 

 not." 



Range and distribution: Upper Coal Measures; Cameron's 

 Bluff, near Lawrence. 



AGASSIZOCRINUS. 



Truest, Jour. Amer. Asso. Adv. Sci. Camb. Meeting, p. 60, (1850). 

 Wachsmuth and Springer, Revis. Paleocrin., Ill, p. 262, (1K85). 



Agassizocrinus carbonarius. Plate VI, fig. 8. 



Agassizocrinus carbonarius Worthen, Geol. Surv. 111., v, p. 566, pi. xxiv, 



'f. 4, ilS7:]i. 



Infrabasals large, completely fused, semielliptical. The up- 

 per faces of the infrabasals are quite concave, and consequently 

 angular at the suture. The cavity is moderately deep. Meas- 

 urements : Height of the infrabasals, 10 mm. ; diameter at their 

 summit, 11 mm. The faces of all five plates are equal. 



Range and distribution: Upper Coal Measures ; Kansas City. 



The infrabasals of this species were figured by Worthen, with- 

 out description, from Illinois. It is the only species of the genus 

 known in the Coal Measures of the United States. The radials, 

 basals, arms, etc., of this species are not yet known. 



