53 



Family EUOALYPTOCRINIDJE. 



EUCALYPTOCRINUS WORTHENI, n. Sp. 



Plate IV, Fig. 2, lateral view. 



The arms in the specimen illustrated are drawn away from 

 the summit about half an inch, which gives them a bushy or 

 broom-like aspect ; if they were replaced between the interbra- 

 chial plates and closed, at the top, the general form of the body 

 would be ellipsoidal. 



Body medium size, with arms and interbrachials in place ellip- 

 soidal in outline; surface of the plates granular. 



Calyx a little more than one-third the entire length of the 

 body, bowl or urn-shaped, wider than long; sutures distinct. 

 Column round, medium size. Basals developed in the interior. 



First radials rather large, rapidly expanding, and one-third 

 wider than high. Second radials nearly square, being only a 

 little wider than high. Third radials rather larger than the 

 second, heptagonal, greatest width at the union of the superior 

 and inferior sloping sides. First secondary radials pentagonal, 

 about two-thirds as large as the third primary radials. Second 

 secondary radials, short, about one-third as large as the second, 

 expand upward, somewhat like an inverted frustum, and sup- • 

 port the tertiary radials upon the upper slightly sloping sides. 

 There are three short quadrangular tertiary radials below the 

 summit of the interradials, and then the free arms commence 

 with one or two cuneiform plates followed by interlocking ones, 

 which maintain a somewhat uniform size, until they taper at 

 the summit, where the solid interbrachials unite around the 

 orifice. The arms being thrown out from between the interbra- 

 chials, in our specimen, probably, causes them to appear larger 

 than they would if they were in place. They are somewhat 

 crystalline and the sutures are more or less obliterated, and, 

 therefore, the interlocking plates may be indicated, in the illus- 



