THE CRINOIDEA 



163 



in the cup. It leads on to TryUiocrinus, Geinitz (1867; syn. Spyridio- 

 crinus, Oehlert, 1891), Lower Devonian, Germany and France, which 

 also has a concave base. Technocrinus, Hall (1859, W. & Sp., 1897), 

 Devonian, Md., U.S.A., base convex, arms not branching beyond IIIBr, 

 no illBr ; the cup plates have axial folds as in Dolatocrinidae, which 



FIG. LXXVII. 



Eucalyptocrinidae. 1, Callicrinus murchisonianus from the side, arms removed except on 

 the right ; 2, plates from distal end of anal tube ; 3, the same plates from C. costatus ; 4, similar 

 plates described by Hall as Cryptodiscus ; 5, calyx of Callicrinus costatus; 1, 2, 3, k denote 

 successive circlets of the anal tube ; i, ii, iii, denote the areas of origin of interbrachial 

 processes. Other letters as usual. 1, 2, 3, 5, after Angelin ; 4, after Hall. 



family may be thus connected with Corymbocrinidae. FAMILY 5. 

 EDCALYPTOCRINIDAE. Melocrinoidea with usually concave patina of 4 BB 

 and 5 RR ; in each half-ray are 2 IIBr, supporting HIB^ (and in 

 Eucalyptocrinu* IIIBr ), followed by IIIBr, proximally uniserial, distally 

 biserial ; iBr 3, 2 resting on 1 ; illBr 1 ; tegmen elevated in a central 

 anal tube, and composed of 4 circlets of large plates, variously shaped 



