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



In most American species of Eucalyptocrinus, the anal 

 opening is among a series of small plates forming the central 

 part of the flat platform of wing-like processes. Only in 

 Eiicalyptocrinus lindahli Wachsmuth and Springer do the wing- 

 like processes extend strongly outward horizontally as in 

 Eucalyptocrinus rosaceus, the genotype. 



At present there is no disposition on the part of specialists 

 to subdivide the genus Eiicalyptocrinus , so that Crinocystites 

 chrysalis may be regarded provisionally as the anal tube of some 

 species of Eucalyptocrinus . Eventually, however, it may be 

 found desirable to segregate those species in which the anal 

 tube rises conspicuously above the platform of wing-like 

 processes. In that case it may be necessary to determine 

 whether the American species here discussed are as closely 

 related to Hy panthocrinites decorus as the general appearance 

 of the latter suggests. 



Eucalyptocrinus proboscidialis Miller. 



(Figure 4.) 



Eucalyptocrinus proboscidialis Miller, Jour. Cincinnati Soc. Nat. Hist., 5, 1882, 

 p. 224, PI. 9, Fig. 2. 



Calyx obconical, risinf^ from a small, flattened base, consisting of the 

 basals alone. Radials almost as tall as wide; first costals fully as tall as 

 wide; second costals with equilateral pentagonal outlines. First dis- 

 tichals about equal in size to the second costals, those of the same ray 

 in contact with each other laterally, so that the interdistichal does not 

 truncate the second costal but has an angular basal margin. Second 

 distichals much smaller; the palmars which support the arms are not 

 differentiated clearly; the interdistichal is narrower but slightly longer 

 than the second distichals. The lower interbrachial is almost twice as 

 tall as wide; it is surmounted by a pair of interbrachials the upper parts 

 of which project distinctly above the general margin of the calyx. The 

 width of the calyx at its upper margin is about four-fifths of its vertical 

 height. 



The lower part of the tegmen, for a vertical height of 5 mm., is only 

 slightly narrower than the top of the calyx; above this point it contracts, 

 at first rapidly and then more gradually, reaching its narrowest dimen- 

 sions about 24 mm. above the top of the calyx. Farther up it widens 

 again, at first gradually and then more rapidly, to a level 37 mm. above 

 the top of the calyx, somewhat as in a very much elongated hour-glass. 

 To this height extend the compartments sheltering the arms. Above this 

 extends an anal tube about 53 mm. in length. 



The lower part of the tegmen, for a vertical height of 11 mm., con- 

 sists of a circlet of 10 oblong plates separated toward the base by a 

 series of smaller plates, also 10 in number. Each of the 10 larger oblong 



