TROOST *S CRINOIDS OF TENNESSEE — E. WOOD. ll 



they are not formed of pores as in the preceding species, and whereas in that species 

 five and six series of pores proceed from the center of the plates, in the C. insculptus, 

 only four elevated ridges proceed from the center. 

 Decatur County. 



The difference in surface between Troost's C. meconideus and his 

 C. granulatus and ('. insculptus may be accounted for by the former 

 having been apparently an exfoliated specimen. The form described 

 as C. insevlptus was probably a young individual, which might 

 account for the smaller number of radiating ridges on the plates. 

 The differences brought out by Troost's descriptions and figures of 

 these three specimens seem insufficient to separate them as distinct 

 species. They are therefore united under the name of an apparently 

 identical species described by Miller and Gurley [1896 (April), p. 63]. 



Formation and locality. — Brownsport limestone. It occurs in Deca- 

 tur County, Tennessee. 



Cat. Nos. 89904, 39905, U.S.N.M. 



CARYOCRINUS GLOBOSUS Troost. 

 Plate 2, fig. 1. 



Caryocrinites globosus Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 1850, 

 p. 60 (nomen nudum); MSS., 1850. 



Caryocrinus globosus Shumard, Trans. Acad. Sci. St. Louis, II, 1866, p. 351 

 (catalogue name). — Miller, North Amer. Geol. and Pal., 1889, p. 231 (cata- 

 logue name). 



The original description by Troost is as follows: 



Distinguished by its globular form, flat pelvis, and capital integument which hardly 

 projects above the general surface of the body. 



The figure of this species resembles in general outline, one of Roe- 

 raer's figures [1860, pi. 3, fig. la] of C. ornatus, now referred to C. 

 milligani, but it has a less elongate base and apparently a smaller 

 tegmen. 



Formation and locality. — Brownsport limestone. Decatur County, 

 Tennessee. 



Cat. No. 39907, U.S.N.M. 



CARYOCRINUS BULBULUS Miller and Gurley. 

 Plate 2, fig. 2. 



Caryocrinites hexagonus Troost, Proc. Amer. Ass. Adv. Sci., II (read 1849), 

 1850, p. 60 (nomen nudum); MSS., 1850. 



Caryocrinus hexagonus Shumard, Trans. Acad. Sci. St. Louis, II, 1866, p. 359 

 (catalogue name).— Miller, North Amer. Geol. and Pal., 1889, p. 231 (cata- 

 logue name). 



Caryocrinus bulbulus Miller and Gurley, Bull. No. 5, Illinois State Mus. Nat. 

 Hist., 1894, p. 11, pi. ii, figs. 15, 16, 18, 19. 



The original description by Troost is as follows: 



It is distinguished from the C. meconideus [milligani] by the form of the costals 

 [basals] which are in the C. hexagonus more elevated in their center which give to the 



