382 PROCEEDINGS OP TEIE ACADEMY OF [1881. 



rangulai", but they change directly into wedge-form, and grad- 

 ually into a double series of interlocking pieces. Pinnules 

 closely arranged. 



Interradials numerous, the lower one resting upon the basals. 

 There are from ten to twelve in the typical species, with a few 

 additional plates at the anal side. 



Dome elevated, composed of a large number of small pieces. 

 Anus and column unknown. 



The only known species is : — 



Thylacocrinus Oehlcrt. Extr. du Bull. Soc. Geol. de France (ser. 3), vii, PI. 1, fig. 1. 

 Devon. St. Germain, France. 



11. ANTHEMOCRINUS nov. gen. 

 (^av&eiiov, a blossom ; Kpivov, a lily). 

 Syn. Eucrinus Angelin. (in p&,rt). Iconogr. Crin. Suec. 



Among the species described by Angelin under Eucrimis, 

 there are two which differ materially from the rest in having only 

 two primar}^ radials, a single interradial, and this plate resting 

 directly upon the basals ; also in the arm structure. These 

 characters, in our opinion, are sufficient to justify the removal of 

 the species from Eucrinus^ and we propose to establish for them 

 the genus Antheviocrinus, with Angelin's Eucr. venustus = 

 Anthemocrinus venustus as type. 



Generic Diagnosis. — Calyx depressed, subglobose, composed of 

 comparatively few plates, which in both known specimens are 

 convex and striated. 



Underbasals five (Angelin), small. Basals five, large, subequal, 

 hexagonal, the upper side truncated for the support of an inter- 

 radial plate. Primary radials 2 X 5, both pentagonal, wider 

 than high, of nearly equal size and similar form ; the first and 

 second meeting by straight margins. The second plate supports 

 upon each sloping side a single secondary I'adial, which in turn 

 supports a heavy arm, this soon divides, sometimes a second 

 time, and the branches after each division are half as large as the 

 arm below. All the arms and branches, from the base up, are 

 composed of two rows of joints, alternately arranged, very slightly 

 interlocking. The first arm joints are enclosed within the body 

 walls by one or two interbrachial plates. The branching of the 

 arms and the whole arm structure is very similar to that of 

 Periech ocrin us. 



