PLATE 45. 



Fig 1. 590. 1. Lecanocrinus macropetalps. (Pag. 199.) 



1 a. An individual preserving a poitiun of the column. 



1 i. A larger specimen, showing the intercalated plates between the costal and scapular scries. 



1 c. The opposite side of the same specimen, showing the simple structure. 



1 d. A smaller specimen, showing the side with the intercalated i)Iates as in fig. 1 4. 



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 iu the preceding figures. 



I A. A fragment of the column enlarged, willi a section of the same size, Viewing the crenulalions near the 



outer margin of the joints, the form of the canal, etc. 



Fig. 2, 3, 4, 5, 6, 10, 11. Cohimns of undetermined Crinoidea. ( P^ig- 231.) 



2. Structure of the basal portion of Ichthjocrinus, with an intercalated plate, showing its analogy wiih 



Lecanocrinus. 

 3 a, b. A fragment of a small column, composed of unequal joints witli 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 nnmerous an 1 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 iu part of thin irregular plates not continuous 



on the margins. 



6 a, 6, c. A fragment of a compressed colunm, 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 

 sami, showing a large irregularly triangular canal. 



II a, b. A fragment of a root, with few radfclcs; and a section of the same, showing a hexagonal canal. 



Firr. 7. 604. 2. Myelodactylus braciiiatus. (Pag. 232.) 



7 a. A small fragment enlarged, showing two lateral appendages. 



7 6. 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. 



Fig. 8, 9. 60-5. 3. Myelodactylus ? (Pag. 232.) 



8 n, 6. A fragment, which is compressed either naturally or by accident. The section 8 i shows the form of 



section. 



9 o, b, c. A'jother fragment, an.l the section, showing the difference of form iu the two. 



