120 FOSSIL CRINOIDS. 



Crinoids of that prolific locality; they come out from under the overhanging 

 tegmen plates much like those of Gilbertsocrinus, and were no doubt as small, 

 and not improbably pendent. 



BATOCRINIDAE. 



DoRYCRiNUS Roemer. 



This case is the reverse of the last. Instead of bringing a Silurian genus 

 forward to the Devonian, we have a species which carries a Carboniferous genus 

 back to that age. The Batocrinidae {sensu Wachsniuth and Springer) began 

 in the Ordovician; but Dorycrinus and its immediate congeners have been 

 hitherto restricted to the Lower Carboniferous, except for " Actinocrinus " cas- 

 sedayi Lyon, and some unfigu red species by Hall from the New York Hamilton, 

 and the small "Actinocrinus" prumiensis of Miiller, to which must be added for 

 i-easons already stated, the " Rhodocrinus" quinquelobus of Schultze. The real 

 spiniferous Dorycrinus, until now, has been supposed to begin in the Lower 

 Burlington Limestone; but here is a good one from the Hamilton, at the same 

 locality as the last: — 



Dorycrinus devonicus, sp. nov. 

 Plate III, figs. 12o-d, 13. 



Caljrx elongate, narrowly turbinate to the first axillary, greatly enlarged and 

 deeply lobed above; spreading as from 1 at the base gradually with straight 

 sides to 3 at the axillary IBr, and then suddenly to 5 at the arm bases ; narrowly 

 truncate below, and highly arched in the tegmen with deep interbrachial con- 

 strictions; tegmen much larger than dorsal cup, and bearing large projecting 

 spines on the interambulacral axillaries. Dimensions of medium sized speci- 

 men: height to bottom of arm bases, 12 mm.; total height, 23 mm.; width at 

 base, 4 mm.; at axillary IBr, 12; and at arm bases — the widest part — 21 mm. 



Basals forming an erect cup. Radial series elongate, with low median ridge, 

 diminishing in width and branching twice in the calyx, giving 4 arm openings 

 to the ray, facing outward in large projecting lobes; arm openings large and 

 elongate; radial lobes very large, being, from the lower edge of arm facets up, 

 nearly as high as the whole of the dorsal cup below them; a large hollow pro- 

 tuberance stands above each pair of arm bases, and another still larger one 



