PLATE 45. 
1. 590. 1. Lecanocrinus macropetalus. (Pag- 199.) 
1 a. An individual preserving a portion of the column. 
1 b. A larger specimen, showing the intercalated plates between the costal and scapular series. 
1 c. The opposite side of the same specimen, showing the simple structure. 
1 d. A. smaller specimen, showing the side with the intercalated plates as in fig. 1 b. 
1 e. The crown of this specimen, showing the infolded arms. 1 /. The base of the same. 
1 g. The structure of this species, as shown in the preceding figures. 
I h. A fragment of the column enlarged, with a section of the same size, showing the crenulations near the 
outer margin of the joints, the form of the canal, etc. 
2, 3, 4, 5, 6, 10, 11. Columns of undetermined Crinoidea. (P a g- 231.) 
2. Structure of the basal portion of Ichthyocrinus, with an intercalated plate, showing its analogy with 
Lecanocrinus. 
3 a, b. A fragment of a small column, composed of unequal joints with rounded edges, having scattered 
spines upon the edges of the thicker joints. 
3 c, d. Enlargements of the same, showing the form of joints, and the striae upon the articulating surface. 
4 a, b, c, d. A fragment similar to the preceding, having the spines more numerous and proportionally 
longer, while the articulating surfaces are concave at one end and convex at the other. 
5 a, b, c. A fragment of a column, having the joints composed in part of thin irregular plates not continuous 
on the margins. 
6 a , b, c. A fragment of a compressed column, having two distinct centres, though appearing as one exter¬ 
nally. It is composed of alternating joints of equal thickness, but of unequal width. 
10 a, b. A fragment of a root, with numerous radicles, of an undetermined species; with a section of the 
same, showing a large irregularly triangular canal. 
II a, b. A fragment of a root, with few radicles; and a section of the same, showing a hexagonal canal. 
7. 604. 2. Myelodactylus brachiatus. (Pag. 232.) 
7 a. A small fragment enlarged, showing two lateral appendages. 
7 b. Transverse section of the same. 7 c. Section of one of the cylindrical appendages. 
7 d. A larger convolute fragment, with several appendages near the lower part. 
7 e. The convex or outer side of this specimen, which has a depression along the centre, from the upper part, 
nearly to the base, where it gradually becomes obsolete. 
8, 9. 605. 3. Myelodactylus-? ( Pag. 232.) 
8<i, b. A fragment, which is compressed either naturally or by accident. The section 8 b shows the form of 
section. 
9 a, b, c. Another fragment, and the section, showing the difference of form in the two. 
