6 9 4 



NORTH AMERICAN INDEX FOSSILS. 



284. L. terebra Hall. (Fig. 992.) Devonic. 

 Whorls embracing to just below periphery; shoulder flat or 



concave ; spire slender ; striae strong. 

 Chemung of New York. 



285. L. yandellana Hall. (Fig. 993.) Mississippi^ 



Fig. 991. Loxonema noe, X 3> an d 

 apical portion enlarged, X : 3- (After 

 Clarke. ) 



Fig. 992. Loxonema terebra. 

 Hall, Pal. N. Y., V. ) 



(After 



Small, with gently convex whorls and deep sutures ; striae very 

 gently undulating, not curved. 



St. Louis (Spergen) of Indiana ; Waverly of Ohio (?). 

 286. L. multicostatum M. and W. (Fig. 994.) Carbonic. 



Fig. 993. Loxonema 

 yandellana. ( After 



Whitfield, Amer. Mus. 

 Nat. Hist. ) 



4 



Fig. 994. Loxonema 

 multicostatum, X2. (After 

 Meek and Worthen, Pal. 

 111., II.) 



Fig. 995. Loxonema 

 rugosum, X 2 - (After 



Meek and Worthen, Pal. 

 111., II.) 



Small, round-whorled, rather broad-spired, with numerous gently 

 and simply curved striae, about 30 on the body whorl. 

 Coal measures of Illinois, Iowa, and Missouri. 



