52 Trans. Acad. Sci. of St. Louis. 



Codonites inopinatus, Rowley and Hare. 

 Granatocrinus excavatus, Rowley and Hare. 

 Codaster gracillimus, Rowley and Hare. 

 Codaster grandis, Rowley. 

 Lophoblastus conoideus, Rowley. 

 Lophoblastus marginulus, Rowley. 

 Carpenteroblastus pentagonus, Rowley. 

 Carpenteroblastus magnibasis, Rowley. 

 Carpenteroblastus pentalobus, Rowley. 

 Carpenteroblastus stella, Rowley. 

 Codaster laeviculus, Rowley. 

 Granatocrinus calycinus, Rowley. 

 Granatocrinus spinuliferus, Rowley. 

 Pentremites benedicti, Rowley. 

 Troostocrinus dubius, Rowley. 



DESCRIPTIONS OF NEW SPECIES. 



Pentremites tulipaformis n. s. 



Plate IV., Fig. 10, 11. 



Body oval in outline with the broadest part downward and 

 the greatest transverse diameter at the apex of the ambulac- 

 rum. Basals small, each rounded and nodose, causing the 

 articulation surface of the column to become a little depressed 

 or sunk between these three nodules and therefore not visible 

 in a lateral view. Ambulacrum broad, leaf -like and groove- 

 like, occupying three-fourths of the whole length of the body. 

 Poral pieces ten to one-eighth of an inch. Interambulacral 

 space smooth and not depressed, giving the lower part of the 

 body a somewhat rounded form. Lateral expansion of the 

 deltoid occupying about one-third of the whole length of the 

 calyx. Genital openings and mouth small and close together. 

 This species belongs to the Chester limestone and is found at 

 Kaskaskia, Illinois, but is by no means common. 



