34 Trans. Acad. Sci. of St. Louis. 



5. Palaechinus LACAZEi Julieii. 



1890. Palaechirius Lacazei. Julien, Compt. rend. Acad. 

 Sci. Paris, T. 110, p. 737. 



1896. Palaechinus Lacazei. Julien, Terr. Carb. Marin 

 France Centrale, p. 128, pi. 16, figs. 3, 4, 5. 



1897. Palaechinus Lacazei. Tornquist, Abhdl. Geol. Karte 

 Elsass-Lothr., Bd. 5, Hft. 6, p. 742, taf. 20, figs. 

 1-4; taf. 21, fig. 1. 



Interambulacrum composed of four columns of broad plates 

 which do not imbricate and are covered with numerous small 

 tubercles. Each ambulacral plate has one large tubercle and 

 one pair of pores (?) In the primary plates the pores occupy 

 the outer third of the ambulacrum, while in the secondary 

 plates they are placed on the outer edge of the ambulacrum. 

 Each pair of pores is placed in an oval depression. Ambu- 

 lacral plates imbricate slightly. 



Geological formation and locality : Carboniferous, I'Ar- 

 doisiere. Central France; Hunsriickenwald, Elsass, Germany. 



6. Palaechinus sphericus Scouler. 



1844. Palaechinus sphaericus. Scouler, M'Coy, Foss. of Ire- 

 land, p. 172, pi. 24, fig. 5. 



1850. Palaechinus sphaericus. D'Orbigny, Prodrome, vol. 1, 

 p. 154. 



1858. Palaechinus sphaericus. Desor, Syn., p. 158. 



1862. Palaechinus sphaericus. Dujardin et Hupe, Echino- 

 dermes, p. 464. 



1869. Palaechinus sphaericus. De Koninck, Bull. Acad. 

 Bruxelles, ser. 2, vol. 28, p. 546, fig. 1. 



1870. Palaechinus sphaericus. De Koninck, Geol. Mag., vol. 

 7, p. 259, pi. 7, fig. 1. 



1874. Palaechinus sphaericus. Baily, Journ. Eoy. Geol. 



Soc. Ireland, ser. 2, vol. 4, pt. 1, p. 41. 

 1874. Palaechinus sphaericus. Loven, Kongl. Svens. 



Vetens. Akad. Handl., Bd. 11, No. 7, p. 41. 



