INVERTEBRATES. 139 



on either side, which are situated about one-third the distance 

 from the inner margin to the dorsal band. Umbilical depres- 

 sion broad and shallow. 



The surface of the shell in some of our specimens is thickly 

 pitted with small rounded depressions that are plainly visible 

 under a good lens, but they may, however, be due to some 

 secondary cause. 



Greatest diameter of the shell % inch; transverse diameter of 

 the outer volution % inch. 



Position and locality : This rare and beautiful little shell was 

 found in the lower Coal Measures of Peoria county, 111. 



Collector, Mr. Gifford. 



No. 2531 of the Illinois State Museum. 



GENUS LOXOXEMA, Phillips. 

 LOXONEMA PEORIENSE. Worthen. 



PI. XXin, Fig. lo-lOa. lOb. 



Loionema Peoriensis. Worthen. March, 18S4. Bulletin No. 2 of the Illinois State Museum 



of Natural History, page 7. 



Shell below the medium size, elongate conical, spire very grad- 

 ually tapering to a minute point. Volutions about sixteen, con- 

 vex, increasing very gradually in size; the lower ones a little 

 flattened above the middle. Suture moderately deep, surface 

 smooth. Aperture nearly round. 



Length % inch; diameter of the lower volution 3 / 16 inch. 

 Spiral angle 16. 



This species is nearly related to L. cerithifonnis of Meek and 

 Worthen. described and figured in Vol. II of these reports, page 

 379, PI. 31, fig. 13, a, b, c, but may be readily distinguished 

 from that, by its more slender form and more numerous volu- 

 tions. 



Position and locality: Coal Measures, Peoria county, 111. 



Collector, Mr. Gifford. 



No. 2532 of the Illinois State Museum. 



