CUINOIDKA CA.MKIIATA 



147 



Melocrinu$, <:..ldf. (Cfciwerww*, Broun), (Fig. 249). Calyx pyriform or 

 melon-shaped, highly ornamented with i-adiating ridges or small nodules. li 

 four : /' hexagonal ; /// numerous ; those of the posterior interray enclosing one 

 or more Mipplementary anals. Tegnien formed by relatively large, asym-. 

 metrical orals. Anal aperture eccentric, rarelv extended in a small tube. 

 histidials <if the sann- ray later- 

 ally united, either as far as the 

 full length of the arms, or only 

 for a short distance. They form 

 in all five free ealycular append 

 ages, composed of single joints. 

 From the outer sides of these 

 appendages hiserial, pinnule hear 

 ing arms are given oft' at intervals 

 in a lateral direetion. Column 

 round : axial canal small, round, 

 or obtusely pentagonal. Silurian 

 and Dexonian; Europe and N. A. 



Tn-hnocriims, Hall. Like Melo- 

 ci-uni.t. but having strong, simple, 

 uniserial anus, which do not bifur- 

 eat e in the free state. Interbrach- 

 ials not enclosing supplementary 

 anals. Oriskany ; Maryland. 



Murim-riiius, Hall (emend. W. 

 and Sp.) B four. Arms biserial, 

 and given off' directly from the 

 calyx in an oblique direction. 

 Surface ornamentation like Glypto- 

 crinus ; otherwise resembling Melocrinus. Silurian ; Europe and North America. 



('ni-iiinliin;-iiiuti, Ang. (Polypeltes, Aug.) Dorsal cup strictly pentamerous. 

 B four, forming an inverted cup, and hidden beneath the column. Interbrachials 

 large, not enclosing anal plates. Arms biserial, dichotomous, and closely 

 apposed. Silurian ; England and Gottland. 



[The genus Polypdtes, Ang., is shown by Wachsmuth and Springer to have been 

 founded upon erroneous observations, P. yranulatus, Ang., being certainly a multi- 

 bruchiate tJoriiinlnH-rinn.<, in which the B and R are concealed in the inverted cup of 

 the base. The family Polypeltidae, which was established by Angelin for the recep- 

 tion of this genus, is therefore discontinued.] 



Patelliocrinits, Angelin (Fig. 242). Silurian ; Gottland. 



Scyphocrmus, Zenker. Calyx very large and elongate. Symmetry of dorsal 

 cup slightly disturbed by anals which are interposed between the interbrachials. 

 B four ; distichals five or more ; the lower palmars incorporated in the calyx, the 

 upper ones free. Interbrachials very numerous. Arms biserial, long, branch- 

 ing. Silurian : Bohemia. 



Glyptocrimts, Hall (Fig. 250). Dorsal cup obconical to sub-globose, orna- 

 mented with radiating striae passing from plate to plate ; the elevations 

 following the rays more pronounced, and forming well-defined rounded ridges, 

 which meet imperceptibly with the free arm-plates. B five ; interbrachials very 



Fie;. -24'.'. 



Ctenoi-i-iii a* til/Hi*, Bronn. Devonian (Bplriferen-Saodatein) ; 

 Daun, Eifel. B, Basul.s. ( ', Mould of stem-joints (the so-called 

 " Schraubensteine "). 



