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Lis? OF ILLUSTRATIONS IN THE TEXT, 
. Transverse sections of the Pentacrinine Stem. Outline diagrams, a—/ 
. Internodals of the Pentacrinine Stem. Outline diagrams, a—/ , : ; Bee 
. Diagram of three sectors of the joint-face of a Pentacrinine internodal, showte different types 
of development and the terms applied thereto . 
. The diameters of a cylindrical and of a stellate columnal ara ; LN Ae on aoe 
. Axial nerves and vessels in an intersyzygium of Isocrinus candelabrum. A, joint-face of the 
hypozygal, x 15 diam. , central portion of the ground section of the epizygal, » 65 diam. 
. General orientation of Echinoid ambulacra and interambulacra em a es ie ‘ 
. Diagram showing the normal direction of imbrication in Echinoid ambulacrals and hioranbie 
lacrals . 
. Diagram illustrating Terminology of Echinoid saterainbulacrals and Siniaeets 
. The Terminology of a main Tubercle, illustrated by a transverse section mS 
. Diagram to show relations of ambulacrals to interambulacrals in Tr Ce aseiane persinilis 
x 36 diam. . 
. Three diagrams showing Terminology of primary Radioles 
. Anaulocidaris testudo ; Radioli remiformes (a—/) . 
» > Radioli spatuliformes (a—e) 
> > 7) 
(k—o) 
» > » > (p—s) 
two views of a trulliform radiole 
two diagrams of a trulliform radiole, to show direction of lines of 
ornament . : 
» Radioli trulliformes (a——c/) . 
(e—h) . 
» > (7—l) 
(u—p). 
» a (gs): 
Radioli paletiformes (a, c, e, i) 
» > > » (7, Lm, 0). . 
(Pp. g; 7-4, v). 
Anaulocidaris Buchi. Radiolus remiformis (MM a) . 
(MM b) . 
(MM c) . 
; , ; (RAW a) 
» ) » (HMW a) 
> > » > (HMW /P) 
, : ; 7 (HMW c) 
> » » » (BM a) 
» > > (BM b) 
> > ? (BM ec) 
