PLATE IV. 



Page 

 Fig.'l. Ventral aspect of the internal cast of a specimen of Teleiocrinus, with sub- 



tegminal ambulacra resting against the inner floor (f) 102 



2. The same aspect in a natural cast of Physetocrinus ventricosus 102 



3. The same in a cast of Physetocrinus ornatus 102 



4. The same in a cast of Strotocrinus regalis 102 



5. Internal cast of a Dorycrinus, of which the median part of the ambulacral 



skeleton, contrary to the case of the four preceding species, does not touch 

 the inner floor of the tegrnen 102 



6. Cast of a Platycrinus, in which the ambulacra are subtegminal to the arm 



bases, being placed at some distance from the inner floor of the disk . . 102 



7. Cast of an Eutrochocrinus Christyi, showing impressions of the lining covering 



the inner floor of the disk 102 



8. Cactocrinus glans, showing fragments of the convoluted (digestive) organ, and 



to the left the subtegminal ambulacra of one ray (f) 102 



(In the following specimens — Figs. 9 to 17 — a second anal opening is 

 introduced at various parts of the calyx, the regular aperture having 

 probably been obstructed.) 



9. A specimen of Batocrinus, in which a new opening has been formed between 



the basals toward the anterior side 136 



10. A specimen of Batocrinus subcequalis, with an abnormal opening directly 



above the basals, involving the whole of the right posterior side of the 

 dorsal cup (slightly enlarged) 136 



11. A small specimen of Teleiocrinus umbrosus, with a second tube passing out 



from the tegmen 136 



12. A Steganocrinus pentagonus, with a second anal tube given off near the base 



of the regular one 136 



13. A malformed specimen of Eutrochocrinus Christyi, with a second tube formed 



above the arm bases 136 



14. A Batocrinus laura, with a second tube given off from the base of the origi- 



nal one and a third tube apparently in process of formation 135 



15. A specimen of Macrocrinus jucundus, in which a small tube branches from 



the regular one 136 



16. The anal tube of Eutrochocrinus Christyi with a transverse lateral branch . 135 



17. Another tube of the same species bifurcating above the tips of the arms . . 136 



18. The base of a Platycrinus, showing irregular, wart-like protuberances, dotted 



with small circular pits. 



19. A radial plate with similar pits, surrounded by a circular rim. 



20. A piece of a column affected in a similar manner. 



(All specimens are in the collection of Wachsmuth and Springer, except 

 that of Tig. 6, which is in the collection of Mr. E. E. Eowley.) 



