ORDER II CRINOIDEA—CAMERATA 147 
Melocrinus, Goldt. (Ctenocrinus, Bronn), (Fig. 249). Calyx pyriform or 
melon-shaped, highly ornamented with radiating ridges or small nodules. 2 
four ; £ hexagonal; J? numerous ; those of the posterior interray enclosing one 
or more supplementary anals. Tegmen formed by relatively large, asym- 
metrical orals. Anal aperture eccentric, rarely extended in a small tube. 
Distichals of the same 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 calycular append- 
ages, composed of single joints. 
From the outer sides of these 
appendages biserial, pinnule-bear- 
ing arms are given off at intervals 
in a lateral direction. Column 
round ; axial canal small, round, 
or obtusely pentagonal. Silurian 
and Devonian; Europe and N. A. 
Technocrinus, Hall. Like Melo- 
crinus, but having strong, simple, 
uniserial arms, which do not bifur- 
cate in the free state. Interbrach- 
lals not enclosing supplementary 
anals. Oriskany ; Maryland. 
Mariacrinus, Hall (emend. W. 
and Sp.) £& four. Arms biserial, 
and see off directly from the Ctenocrinus typus, Bronn. Devonian (Spiriferen-Sandstein) ; 
calyx in an oblique direction. Daun, Eifel. B, Basals. C, Mould of stem-joints (the so-called 
Surface ornamentation like Glypto- , Bebraubeusuene: 
crinus ; otherwise resembling Melocrinus. Silurian ; Europe and North America. 
Corymbocrinus, Ang. (Polypeltes, Ang.) 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. 


Fic. 249. 
g, is shown by Wachsmuth and Springer to have been 
founded upon erroneous observations, P. granulatus, Ang., being certainly a multi- 
brachiate Corymbocrinus, in which the B and FR 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. | 
[The genus Polypeltes, Ang 
Patelliocrinus, Angelin (Fig. 242). Silurian ; Gottland. 
Scyphocrinus, 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. 
Glyptocrinus, 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 
