76 Trans. Acad. Sci. of St. Louis. 



1874. Xenocidaris clavigera. Loven, Kongl. Svens. Vetens. 



Akad. Handl., bd. 11, no. 7, p. 44. 

 1900. Xenocidaris clavigera. Hesse, Neu. Jahrb. Miner. 



Geol. u. Pal., beil. bd. 13, p. 212. 

 Geological formation and locality : Devonian, Muhlenberg 

 near Gerol stein. 



2. Xenocidaris conifera Schliiter. 



1881. Xenocidaris conifera. Schliiter, Verhdl. Nat. Ver. 



Preuss. Eheinl. u. Westfal. Bonn, Sitzungsb., bd. 38, p. 



212. 

 Geological formation and locality: Middle Devonian, Hilles- 

 heiiner-Mulde between Kerpen and Nollenbach. 



3. Xenocidaris cylindrica Schultze. 



1866. Xenocidaris cylindrica. Schultze, Denkschr. Akad. 



Wis. Wien, Math. Naturw. CI., no. 26, p. 126, taf. 



13, figs. 4-4 c. 

 1874. Xenocidaris cylindrica. Loven, Kongl. Svens. Vetens. 



Akad. Handl., bd. 11, no. 7, p. 42. 

 Geological formation and locality: Devonian, Gerolstein. 



BIBLIOGRAPHY. 



*1 Agassiz (A.). Report on the Echiuoidea dredged by 

 H.M. S. Challenger. 1881. 



t2 . A Bibliography of the Echinodermata. 



Bull. Mu>. Comp. Z>ol v vol. 10, no. 2, 1882. 



3 . Calamocrinus diomedae, a new stalked Crinoid, 



with notes on the Apical System and the Homol- 

 ogies of the Echinoderms. 



Mem. Mus. Comp. Zool., vol. 17, no. 2, 1892. 



* An asterisk prefixed to a title indicates that the author has not seen 

 thp article. 



t A dagger prefixed to a title indicates that the article is in the library 

 of Dr. Hambach. 



