72 The Ohio Journal of Science [Vol. XXI, No. 2, 



general surface may have been more or less coarsely papillate, but 

 no direct evidence of this is at hand. 



Locality and Horizon. — From the Cedarville dolomite at 

 Pontiac, six miles northeast of Piqua, Ohio. The type is num- 

 bered 13867 in the Museum of Ohio State University. 



Remarks. — In most species of Eucalyptocrinus the interdis- 

 tichal truncates the top of the second costal. In Eucalyptocrinus 

 proboscidialis this is prevented by the lateral contact of those 

 first distichals which belong to the same ray. Only two other 

 American species of Eucalyptocrinus possessing this character- 

 istic are known. One of these is Eucalyptocrinus obconicus Hall, 

 described from the Racine dolomite at Racine, Wisconsin. In 

 the type of this species the vertical height of the calyx is 19 

 mm., and its diameter at the top is almost seven-tenths of its 

 height. The base of the calyx is obtusely rounded, instead of 

 concave, and the basals may be seen on lateral view of the 

 calyx, though only of short length. 



The second of the American species mentioned above was 

 described by Slocom, also under the name Eucalyptocrinus 

 obconicus (Field Columbian Mus., 2, Geol. vSeries, 1908, p. 301, 

 PI. 86, Figs. 1, 2), though he suspected that it might be distinct. 

 The type of this second species was found in the Racine lime- 

 stone of the spoil heaps along the Chicago Drainage Canal near 

 Lemont, Illinois. It differs from typical Eucalyptocrinus 

 obconicus in being twice as tall and wide; the base of the calyx 

 tapers to an acute angle ; the basals are conspicuously taller and 

 narrower; the radials, first costals, and interbrachials also are 

 taller; the combined effect is to produce a more slender appear- 

 ance along the lower half of the calyx. A cast of the exterior of 

 this specimen shows that the exterior surface of the plates was 

 convex but smooth. For this second species the term Eucaly- 

 ptocrinus slocomi is proposed. 



Extended anal tubes, similar to that of Eucalyptocrinus 

 proboscidialis, probably occurred also in Eucalyptocrinus egani, 

 but the calyx of this species has an impressed base, and the 

 interdistichal truncates the second costal. In species of Calli- 

 crinus the concavity at the base usually is conspicuously deeper 

 and wider than in typcial Eucalyptocrinus. 



