ORDER V 



CRINOI DEA ARTICULATA 



167 



the upper one is axillary, and supports the distichals. Union Wi \veen the R 

 and first costals and between the axillary costals and first distichals is by 

 muscular articulation ; the two costals and the two proximal distichals form 



/,/ i - 



FIG. 277. 



/;/" -ri nits liliiformiti, 

 Mill.T. Muschelkalk ; 

 Hrannschwri-. 



FIG. 278. 



Portions of the calyx and arms of Encrinus. a, Interior 

 of calyx ; a*, Exterior of same ; b, Basal, upper surface ; 

 r, Radial, inner surface ; /3, One of the uniserial, and /3*, bi- 

 serial arm -plates; both of them traversed by duplicate 

 dorsal canals ; p, Pinnule ossicle (enlarged) ; br, First 

 brachial, under surface; frr*-, First and second brachials 

 joined together; inside, seen from below ; br*, First brachial, 

 upper surface, showing line of syzygial suture ; br 2 , Second 

 brachial (axillary), showing articular facets. 



a syzygy, with their apposed faces dotted. Arms ten, or exceptionally 

 twenty; uniserial at their lower ends, but rapidly becoming biserial. Upper 

 and lower faces of stem -joints marked over their whole surface or only 

 around their outer margins with 

 radiating striae. Central canal 

 small, round. Abundant in the 

 Trias, especially in the German 

 Muschelkalk. The stem - frag- 

 ments of E. liliiformis not infre- 

 quently form massive beds of 

 limestone (Trochitenkalk). 



Dadocrinus, v. Meyer. Like 

 the preceding, but smaller, and 

 with uniserial arms. Trias. 



Holocrinus, Jaekel. Trias. 



Family 2. Apiocrinidae. 



d'Orbigny. 



, , , . , , Afiooriuus Parkinsoni, Schlotheim. Great Oolite ; Ran villc, 



Lall/X UnsymmetllCal, Composed Calvados, a, Calyx and upper stem-joints, viewed from the 



nf Itonvii nJnf#Q "Rn<io <n<tt>tirlr\'mn'nf\ side; b, Ventral aspect; c, Articular surface of one of the 



of tieaiy plates. fase pseuaomono- Stern .j 0i ' nt8 (natural size)! 



cyclic ; the infrabasals completely 



fused with the centrodorsal, but rarely visible within the basal ring. Basals jive, 



radials five, occasionally separated by a few interbrachials. Tegmen composed of 



Flo . 27 9. 



