232 Cincinnati Society of Natural History. 



visits at night and in the early morning, the}^ are uncovered at dusk by 

 the bird who incubates them until the morning sun relieves her of her 

 task. 



The complement of eggs is usually seven, but we took one set of 

 eight. 



The above description applies equalh^ well to any of the six nests 

 observed by us, and to the dozens observed by Mr. Porter at the same 

 locality, during the past four or five years; he notes, however, a few 

 instances in which the nest instead of being entirely free at its cir- 

 cumference, as above described, was held in place b}^ the surrounding 

 *' deer-tongue" (Saggitaria?). 



DESCRIPTIOIT OF FOUR NEW SPECIES AND A NEW 



VARIETY OF SILURIAN FOSSILS, AND 



REMARKS UPON OTHERS. 



By S. A. Miller, Esq. 



EUCALYPTOCRINUS DEPRESSCS, U. Sp. 



Plate VII.. flg. 1, side view of the calyx; fig. la, basal view of the calyx; fig. lb, dome and 

 the canal leading from the dome to the top. 



The calyx of this species is remarkably short and deeply depressed 

 below. The depression at the place of the columnar attachment is 

 equal to the height of thecal3^x, and the cavity embraces the first radial 

 plates. The height of the calyx is less than half its diameter. 



The first radials are large hexagonal plates. The second radials are 

 small sub-quadrangular plates, much wider than long, and having the 

 longer side at the base. The third radials are hexagonal, wider than 

 long, and having the longer side resting upon the second radials. The 

 large interradial has ten nearl}- equal sides, but as the angles are 

 obtuse the form is nearl3' circular. It supports upon the upper sides 

 the two interradials that support interbrachials. 



The dome iiinnediateh^ covering the cavitj- of the calyx has a height 

 almost equal to its diameter or nearl}^ twice as great as the height of 

 the calyx. The canal leading from the dome to the top of the inter- 

 brachials expands toward the upper end. 



This species is readily distinguished from others by the extremely 

 short calj'x, deeply depressed base, and prominent dome. It will 

 not be mistaken for E. corniitus var. excavatus, because the latter has 

 a pentagonal excavation at the base, and is otherwise far removed from 

 it. 



