706 A. F. FOERSTE 



Illaenus ; glabellae slightly resembling /. a?ftericanus, but not accompanied 

 by the characteristic pygidia of that species ; probably identical with the 

 forms listed by Safford from the Glade limestone as I. americanus. 



Machirea bigsbyi. 



Crania ; related to setigera, but with the surface of the upper valve crowded 

 with minute pustules which may have been the bases of setae. 



Orthis tricenaria. 



Dinorthis deflecta. 



Dalmanella subaequata, variety. 



Strophomena inciirvata {^filitexta). 



Rafiiiesquina niinnesotetisis {incrassata of Safford). 



Plecta7nbonites sericea. 



Hallina nicolleti? 



Zygospira recurvirostris. 



Rhynchotrema related to inaequivalvis, but with a more triangular outline, 

 and with the sides more flattened, producing a more angular shell ; 

 probably identical with Rh. orientalis of Safford. 



Helopora spiniformis, identified by R. S. Bassler. 



SALTILLO (LOWER TRENTON) FOSSILS. 



Whiteavesia, identified by R. S. Bassler as identical with a species found in 

 the Lower Trenton in Central Tennessee ; W. D. Helton locality. 



Leptobolus, resembling insignis, Clifton. 



Trematis puttctistriata, Clifton, 



Schizocrania (.?) rudis, Clifton. 



Schizocrania, related Xo filosa, Clifton. 



Lingula, Clifton. 



Dalmanella, apparently an ancestral form of D. emacerata from the Utica 

 group of the Cincinnati region; some of the specimens are i8'"'"long 

 and 28™™ wide, but usually the dimensions are 16 by 21. When com- 

 pared with Utica specimens which have not been crushed flat, the 

 similarity is striking. W. D. Helton, Clifton, Wells creek basin. 



Zygospira modesta, with the four median plications of the ventral valve 

 forming a distinct fold, the slightly more distinct median groove 

 separating these plications into pairs ; Clifton. 



CLINTON FOSSILS. 



Illaenus daytonensis, glabellae and pygidia ; 14, 15, 2C)b. 



Illaenus, pygidia resembling madisonianus , but with a less triangular outline; 



found in Clinton of Ohio and Indiana, i^d, 2g. 

 Calymmene vogdesi, pygidia aitid glabellae ; 14, i/\d. 

 Lichas breviceps clintonensis, glabellae and pygidia; 14. 

 Cyrtoceras {Glyptoceras) subcompressum, showing surface marking and siph- 



uncle ; 14. 



