192 



ECHINODERMATA— PELMATOZOA 



PHYLUM IV 



usually limited to a definite number. Eadiah in contact all around. Arms resting 

 in compartments formed by partitions attached to the tegmen. Silurian and 



Devonian. 



Emalyptocrinus Goldf. {Hypanthocrinus Phill.) (Figs. 

 291, 292). Calyx with a deep concavity at the lower end, 

 the B forming the bottom, and the B the sides of an 

 inverted cup. Supplementary pieces of the calyx con- 

 sisting of 1 X 2 interbrachials, and one iuterdistichal ; the 

 latter of the same form as the interbrachials, and nearly 

 as large as the two upper ones combined. Tegmen 

 elongate, its upper part extended to form a tube. It is 

 composed of five ranges of plates, of which the two 

 middle ones are the least regular in their arrangement, 

 and the upper one closes the centre. Attached to the 

 outer walls of the tegmen, and extending to its top, are 

 ten partitions supported by the interbrachials and inter- 

 distichals, which form deep, vertical compartments for 

 the reception of two arms each. Arms twenty, biserial ; 

 composed of very narrow pieces. Column round. Sil- 

 urian ; Gotland, England (Wenlock Limestone), and 



Fig. 291. 

 Eucalyptocrinus regu- 

 /ftW.9 (Hising.). Silurian; ,^ ,, . • /^r- n \ a • i 



Gotland. Crown with JNorth America (JNiagara Group). A single species occurs 



arms removed from one • i.-i t^ • j; , i ttit i 



ray in order to show the m the Devouiau ot the Eifel. 



re^'ose "' ''''"'"^' ^'"^ CalUcrirMS Ang. (Fig. 293). Calyx flask - shaped ; 



concavity at the base deeper and wider than in the 

 preceding, sometimes involving not only the radials, but parts of the 



ui : ri i2 : iri 

 dist. (list. 



Pig. 292. 



Eucalyptocrinus rosaceus (fidldt). Devonian; Gerolstein, Eifel. ^/Perfect crown. B, Diai^ranimatic longi- 

 tudinal section of the calyx (h, Basals ; ri, Radials ; r'-, First costals ; y, Lower, and S, npper piece of the wini;- 

 like processes), f', Tegmen. /), Dorsal cup (/■', Radials ; r-, First costals ; (/■, Inlerradials ; (((st., Distichals ; 

 int. (liKt., Interbrachials; 7-, Palmars) (after L. Schultz(^). 



costals as well. Partitions for the rece])tion of the arms much shorter, ex- 

 tondinc; to less than half the heiiiht of the arras. Otherwise similar to 



