1885.] NATURAL SCIENCES OF PHILADELPHIA. 357 



CALLICRINUS D'Orbigny. 



1850. D'Orbigny {Calliocrinus), Prodr. i, p. 45. 



1878. Angelin (OaUicrmvs), Iconogr. Crin. Suec, p. 14. 



1879. Zittel (Callicrinus), Handb. d. Paleont. i, p. 378. 



Syn. Eugeniacrinites Hisinger (not Miller), 1857, Leth. Suec, p. 86. 



Callicrinus {Calliocrinus d'Orbigny) may be considered as a 

 transition form between C or ymbocrinus of the Actinocrinidse and 

 Eucalyptocrinus. It possesses the structural peculiarities of the 

 latter, but these are not so distinctly expressed, and it appears 

 as if the genus represented an earlier phase in the development 

 of this family. In both genera, the dorsal and ventral side is 

 composed of plates of a similar kind and like number, and both 

 have partitions ventrally ; but, while those of Eucalyptocrinus 

 surround the arms on all sides, the partitions of Callicrinus are 

 rudimentary, the greater part of the arms being uninclosed. 



Generic Diagnosis. — Calyx as in Eucalyptocrinus, extending to 

 the tips of arms, resembling a wine bottle with long, slender neck, 

 and deep concavity at the bottom, but the partition walls, in place 

 of forming deep niches, consist only of braces between the arm 

 bases, projecting out between the lower portions of the arms ; not 

 extending in height beyond the limits of the first ring of plates. 

 Anus central. The plates are frequentby ornamented, sometimes 

 nodose, and certain plates spiniferous. 



Form of calyx, number and arrangement of plates as in Euca- 

 lyptocrinus. Dorsal cup composed of four basals ; 3 >< 5 primary, 

 2X2X5 secondary, and 1X2X10 tertiary radials ; always 3X5 

 interradials and one interaxillary. Ventral side composed of four 

 rings of plates ; the first ring containing five interradials, five 

 interaxillaries, and ten interbrachial pieces. The interbrachials, 

 as a rule, are somewhat larger than those of Eucalyptocrinus, and 

 they are provided, like the interradials and interaxillaries, with a 

 projecting brace, but less prominent than those of the other 

 plates. The latter are always stronger, and sometimes extended 

 into a long spine. The twenty braces or partition walls are 

 arranged parallel to each other, and vertically along the median 

 part of the plates. The second ring, if our interpretation is cor- 

 rect, consists of the four large proximals (compare our remarks 

 in Eucalyptocrinus) ; the third ring of the divided oral or central 

 plate and the two smaller proximals, which agree in their form 

 and arrangement with those in Eucalyptocrinus. The plates of 



