26 Trans. Acad. Sci. of St. Louis. 



Geological formation and locality' : Kaskaskia Group, 

 Pulaski Co., Ky. Keokuk Shales, Crawfordsville, Ind. 



4. Lepidesthes spectabilts Worthen and Miller. 



1883. Ilybochinus spectahilis. Worthen and Miller, Geol. 



Surv. 111., vol. 7, p. 332, pi. 31, figs. 5 a-d, 6, 7. 

 1889. HybocJtinus speciabilis. Miller, N. Anier. Geol. Pal., 



p. 255. 

 1895. Lepidesthes spectahilis. Keyes, Proc. Iowa Acad. Sci., 



vol. 2, p. 184. 

 Test subspheroidal. Five columns of plates in each inter- 

 ambulacrum, plates imbricating downward and outward. 

 Ambulacrum composed of ten columns of plates imbricating 

 from below upward. Two pores in the center of each am- 

 bulacral plate. Surface covered with small granules. 



Geological formation and locality : Chester Limestone, 

 Prairie du Long Creek, Monroe Co., III. ; Pope Co., 111. 



5. Lepidesthes wortheni Jackson 



189(3. Lepidesthes wortheni. Jackson, Bull. Geol. Soc. 

 Amer., vol. 7, p. 207, pi. 9, fig. 53. 



Interambulacral areas consist of three or four columns of 

 quite large hexagonal pieces. Ambulacra have seven or eight 

 columns of many small imbricating pieces with two pores in 

 the center of each piece. 



Geological formation and locality: Keokuk Group, 

 Crawfordsville, Ind. (?). 



INSUFFICIENTLY DETERMINED SPECIES. 



1. Lepidesthes devonicans Whidborne. 



1898. Lepidesthes devonicans. Whidborne, Pal. Soc. Mon., 

 vol. 52, p. 200, pis. 24, 25. 

 Geological formation and locality : Pilton Beds, North 

 Devon and Croyde. 



