10 BULLETIN 64, UNITED STATES NATIONAL MUSEUM. 



B. IRREGULARIA Jaekel. 



Family CARYOCRINID^ Bernard. 



Genus CARYOCRINUS Say. 



Troost described five species of Caryocrinus from Decatur County, 

 Tennessee. All of the specimens are missing; and the following syn- 

 onymy is worked out from the descriptions and figures, all of which 

 are reproduced. It is possible that with the original specimens a 

 different grouping would be made, but the following appeals to the 

 writer as the best that can be done with the available material. 



CARYOCRINUS MILLIGANI Miller and Gurley. 



Plate 2, figs. 3 to 9. 



Caryocrinites meconideus Troost, Proc. Amer. Ass. Adv. Sci., II, 1850, p. 60 



(nomen nudum). 

 Caryocrinites granulatus Troost, Proc. Amer. Ass. Adv. Sci., II, 1850, p. 60 



(nomen nudum). 

 Caryocrinites insculptus Troost, Proc. Amer. Ass. Adv. Sci., II, 1850, p. 60 



(nomen nudum). 

 Caryocrinus ornatus Roemer, Sil. Fauna westl. Term., 1860, p. 33, pi. in, figs. 



la, b, c. 

 Caryocrinus milliganse Miller and Gurley, Bull. No. 9, Illinois State Mus. Nat. 



Hist., 1896, p. 63, pi. v, figs. 3, 4. 

 Caryocrinus roemeri Jaekel, Stammes-geschichte der Pelmatozoen, Berlin, I, 



1899, p. 314, pi. xvn, figs. 3, 3«. 



The following is the original description by Troost: 



It differs principally from the Caryocrinites ornatus of Say in being more elongated 

 and in having a triangular capital integument; the oral [anal] aperture is lower in the 

 meconideus [milligani] than it is in the ornatus — it pierces the scapulars [radials] and 

 does not rest upon the superior angle as is mentioned by Mr. Say respecting the C. 

 ornatus. 



■ Say says the longitudinal diameter is from three quarters to one inch and a half, the 

 transverse from seven tenths to one inch and two fifths. I have specimens which 

 are about three inches longitudinally and two and one fifth inches transversely. 



In superficial configuration and in other respects it coincides with the C. ornatus. 



It occurs in Decatur County, Tennessee, associated with Calceola, Eucalyptocri- 

 nites, Cupellocrinites [Marsipocrinus], etc. 



According to the figures of Miller and Gurley [1896 (April), pi. 5, 

 figs. 3, 4], the anal aperture cuts the upper edge of the radials, but is 

 not wholly within them. 



Of the form to which Troost has given the name Caryocrinites 

 granulatus, he says: 



This species differs from the meconideus [milligani] chiefly by having a granulated 

 surface. 



Decatur County. 



The following is Troost' s description of Caryocrinites insculptus: 



The general form is the same as that of the C. meconideus [milligani] but the sur- 

 face is adorned with projecting ridges which proceed from the center of the plates: 



