NO. 1846. ON CERTAIN ELEUTHEROZOIC PELMATOZOA—KIRK. 131 



Whiteaves, J. F. 



1889. Fossils from the Hamilton Formation of Ontario, with, a list of Species at 

 Present Known from that Formation and Province. Contributions to 

 Canadian Paleontology, vol. 1, No. 2, pp. 91-135, pis. 12-16. 

 Wood, Elvira. 



1909. A Critical Summary of Troost's Unpublished Manuscript on the Crinoids 

 of Tennessee. Bull. 64, U. S. Nat. Mus., pp. i-ix, 1-115, pis. 1-5. 



ZiTTEL, K. A. VON. 



1896. Textbook of Paleontology, pt. 1 (English edition). Tabulated and edited 

 by C. R. Eastman. 



EXPLANATION OF PLATES. 



Plate 1. 



Aristocystis bohemicus Barrande. 



Fig. 1. Specimen showing base of attachment and a side apparently smoothed and 

 somewhat flattened by contact with some extraneous object. From Bar- 

 rande, 1887. (PI. 10, fig. 13.) 



2. View of base, enlarged, showing attachment to a gastropod shell which is 



almost completely overgrown. From Barrande, 1887. (PI. 10, fig. 16.) 



3. Opposite side of the same specimen showing normal convexity and surface 



structure. From Barrande, 1887. (PI. 10, fig. 13.) 



4. Base of another individual showing no sign of attachment. From Barrande, 



1887. (PI. 10, fig. 20.) 



5. Lateral view of a specimen which was completely detached. The smoothing 



of the plates in the upper right-hand portion of the figure indicates contact 

 with some object, and may point to the maintenance of a prostrate exist- 

 ence. From Barrande, 1887. (PI. 10, fig. 21.) 



6. Basal view of the same specimen, showing rounded character of base and total 



absence of signs of attachment. From Barrande, 1887. (PI. 10, fig. 22.) 



7. Lower portion of theca of an individual which apparently was attached. The 



smoothing of the plates on one side is quite evident. From Barrande, 1887. 

 (PL 10, fig. 29.) 



8. The base of the same specimen, showing basal depression. It is to be noted 



that the area of attachment is somewhat excentric in position and that the 

 smoothing of the plates may be attributed to contact with the object to 

 which attachment was had. From Barrande, 1887. (PI. 10, fig. 30.) 



9. View of a very large, incomplete individual. The area of attachment is very 



large but not sharply defined. It is probable that in this case detachment 

 was had late in the life of the organism. From Barrande, 1887. (PI. 10, 

 fig. 23.) 



10. Basal view of the same, showing lateral position of the area of attachment. 



From Barrande, 1887. (PL 10, fig. 24.) 



Echinos phaera aurantium (Gyllenhahl). 



11. Lateral view of theca, showing highly excentric location of the minute pro- 



tuberance that served as the point of attachment. From Jaekel, 1899. 

 (PI. 8, fig. 5.) 



Plate 2. 



Cheirocrinus penniger Eichwald . 



Fig. 1. View of antanal side with ramules restored. From Jaekel, 1899. (PI. 11, 



2. View of anal side of the same specimen. The slight flattening of the theca 

 and the great development of the anal area are especially to be noted. 

 From Jaekel, 1899. (PI. 11, fig. 2.) 



