62 Trans. Acad. Sci. of St. Louis. 



Globoblastus ornatus n. s. 

 Plate v., Fig. 4. 



Body elliptical, longer than wide. Basals very small and 

 depressed. Ambulacrum narrow and linear, extending the 

 whole length of the body. Interambulacral space slightly 

 rounded, wider in the center than near the base where it is 

 rather depressed with little spine-like projections at the base 

 of the sinus for the apex of the ambulacrum. The whole 

 interambulacral space has an outer granulated margin, where- 

 as the inner surface is ornamented by granulations shaped 

 like an elongated spear head. Deltoids very small, with a 

 horn-like projection above the summit and perforated in the 

 center. This species is also easily recognized by the orna- 

 mentation of its interambulacrum. 



Geological position and locality : It occurs in the Burling- 

 ton limestone at various places in Missouri. 



Globoblastus spathatus n. s. 

 Plate v., Fig. 5. 



Body globose, resembling somewhat G. norwoodi in out- 

 line. Vertical and transverse diameters equal. Ambulac- 

 rum narrow and linear extending over the whole length of 

 the body. Interambulacral space flat, ornamented at the 

 outer margin by a row of granulations running down on each 

 side of the fork piece sutures, giving in this manner a double 

 row of granules in the center of each interambulacrum. 

 Each interanibulacral half so marked is ornamented by gran- 

 ulations in the form of a spatula. Deltoids small and protu- 

 berant, perforated in the center. The peculiar ornamenta- 

 tion of the interambulacral space is sufficient to separate it at 

 once from allied forms. 



Geological position and locality: It occurs in the Bur-- 

 lington limestone at Allen ton, St. Louis County, Missouri. 



