CALYPTOCRINID^. 



555 



Remarks. — CaUlcnnus is probabl}- the forerunner of Emalmnocnnus ; it 

 is built on the same phxn, but its family characters were not, as yet, so higlily 

 differentiated as in that genus. 



Callicrinus Beachleri W. and Sp. 



Plate LXXXIIL Figs. Ua, b. 



1892. W. and Sp. ; Amer. Geologist, Vol. X. Sept., p. 140. 



The calyx has the usual form of the genus. Its height to the base of the 

 tube one fourth greater than the width at the top of the dorsal cup; the 

 height of the cup 11 mm., that of the ventral disk IG mm., and the length of 

 the partition walls 8 mm. Dor.sal cup broadly truncated at the base ; the 

 sides almost straight, gradually expanding upwards. The radials and costals 

 at the surtace sharply keel-shaped, especially the former, and the angularity 

 continued upon the distichals, but without attaining the prominence that it 

 has at the lower plates ; the first interbrachials slightly convex, with a small 

 tubercle in the centre. 



Basals small and nearly of the same size, forming a concavity which is 

 rather small and shallow for the genus. Radials near the upper end fully as 

 wide as long, and twice as wide as at the lower part, which curves gently 

 inward to meet the basals. First costals twice as wide as long ; the second, 

 which are longer and wider, rarely truncated by the interdistichal. First 

 distichals twice as large as the second, and but little smaller than the upper 

 costals. The palmars small and pentangular. First interbrachials longer 

 than wide, a little smaller than the radials ; the two above together nearly 

 twice as wide as the first, their upper ends rising to the height of the 

 second or third arm plates. Interdistichals but little smaller than the upper 

 interbrachials, and projecting upward in a similar manner. Ventral disk 

 conical, its sides convex. The ten plates which rest upon the interbrachials 

 and interdistichals, respectively, and form the compartments for the recep- 

 tion of a pair of arms, are twice as high as the ten intervening ones, which 

 rest against the sloping upper faces of the palmars. There are in all twenty 

 partitions around the disk, and each arm occupies a separate compartment. 

 The partition walls are moderately thick, and slightly grooved along their 

 outer faces. The ten larger ones rise to a level with the upper end of the 

 first ring of plates in the di.-ik, of which they form wing-like extensions; 

 they are sabre-shaped and pointed at the ends. The second ring of the disk 



