28 Talbot — New York Helderbergian Crinoids. 



end of the ray. In one specimen, small dome-like inter pal- 

 mars show between the auxiliary arm and the tubular append- 

 age, occupying the same position as in M. nobilissimus, but 

 differing in form. Stem joints alternate in size near the calyx, 

 but farther down the column every fourth one is larger. One 

 individual has a stem 19 cm long, which makes a loop at the 

 distal end about 2 - 5 cm in diameter. Another loop not more 

 than l cm in diameter has two complete whorls. 



M. pachydaetylus is found at Jerusalem Hill with Lepocri- 

 nites gebhardi and many specimens of Homocrinus scoparius; 

 at North Litchfield with Mariacrinus beecheri, Melocrinus 

 nobilissimus, Thysanocrinus arborescens, and Cordyloorinus 

 plumosus. 



Wachsmuth and Springer regard M. paucidactylus and M. 

 pachydaetylus as synonyms, but give no reasons therefor. 

 Hall's distinctions are the narrower calyx and the fewer and 

 more distant arms of the former. The specimen figured on 

 pi. I, ~Q.g. 1, is very narrow, proving the width of the calyx to 

 be variable. The greater distance between the branches of 

 the arms cannot, in itself, be considered a specific difference ; 

 and there seems to be no reason for referring these narrow 

 specimens to another species. 



Horizon and locality. — Near the base of the Coeymans 

 limestone at Schoharie 5* in the upper third of the same lime- 

 stone at Jerusalem Hill and North Litchfield. 



Family, Platycrinidce. 



Genus, Cordylocrinus Angelin. 



Cordylocrinus plumosus (Hall). Plate III, figures 2 and 4; text- 

 figure 3. 



Platycrinus plumosus Hall, Nat. Hist. N. Y., Pal., vol. iii, 1859, pp. 113 

 and 148, pi. 4, figs. 1-5. 



Platycrinus parvus Hall, Nat. Hist. N. Y., Pal., vol. iii, 1859, p. 114, pi. 4, 

 figs. 6-9. 



Cordylocrinus plumosus Waehsmuth and Springer, Rev. Palaeocr., Pt. II, 

 1881, p. 61 ; Proc. Phila. Acad. Nat. Sci., vol. xxxiii, 1882, p. 235; N. Am'. 

 Cri. Cam., vol. ii, 1897, p. 737 ; Atlas, pi. lxxv, fig. 20. 



Cordylocrinus parvus Waehsmuth and Springer, Rev. Palaeocr., Pt. II, 

 1881, p. 60 ; Proc. Phila. Acad. Nat. Sci., vol. xxxiii, 1882, p. 234; N. Am. 

 Cri. Cam., vol. ii, 1897, p. 737. 



Clematocrinus plumosus Jaekel, Zeit. d. deutsch. Geol. Gesell., Band xlix, 

 1897, Verhandl., p. 47. 



Clematocrinus parvus Jaekel, Zeit. d. deutsch. Geol, Gesell., Band xlix, 

 1897, Verhandl., p. 737. 



In the Yale Museum, there are many hundreds of specimens 



of this species ; and at first glance it seemed that substantial 



additions could be made to the descriptions already given. 



Closer examination, however, revealed the fact that in only a 



* Nat. Hist. N. Y., Pal., vol. iii, p. 109, 1859. 



