2^1 Midway Stage 107 



by the figure; whorls about 12, increashig in size regularly from 

 the apex, the penultimate the largest; surface smooth, lines of 

 growth scarcely perceptible, slightly recurved centrally; suture 

 distinct but not deep; body whorl slightly compressed centrally 

 with a few inconspicuous spiral lines at base crossed bj^ lines of 

 growth; anterior canal short, decurved; posterior margin of the 

 mouth showing a small posterior canal. 



The figure is of a gutta-percha impression, and does not show 

 the canal as does the mould from which the impression was made. 

 Other specimens also show the deflected anterior canal and traces 

 of the posterior. 



Locality. — Alabama: Common in the R. R. cut, lYi mi. N. E. 

 of Clayton. 



Type. — Paleontological Museum, Cornell Univ. 

 Cerithiuin vtediavics n. sp., PI. 11, figs. 3, a. 



Specific characterization. — Size and general form as .shown by 

 the figures; whorls 10-12, marked by costse nearly equal in width 

 to the interspaces, about 15 on the penultimate whorl, not so 

 many above; suture sharply defined; each whorl with five or six 

 sharp, raised, spiral lines between which as many more finer ones 

 often appear; body whorl with costse becoming obsolete below 

 the middle, anterior canal short and deflected, posterior margin 

 of the mouth calloused and grooved, forming a posterior canal. 



It seems a pity that this . Cerithiiun so characteristic of the 

 limestone ledges N. E. of Clayton could not be called clayton- 

 ense, but this name is already preoccupied b}^ the large species 

 from Wilcox Co. and which unfortunately is unknown at 

 Clayton. 



Locality. — ALABAMA: In the light yellowish limestone ledges 

 in a R. R. cut, lYz mi. N. E. of Clayton. 



Type. — Paleontological Museum, Cornell Univ. 



Cerithiuin penrosei, ' PI. 1 1 , fig. 4. 



Syn. — C. penrosei — Proc. Ac. Nat. Sci., Phila. , 1895, p. 79, pi. 

 - 9, fig- 4- 



Harris* origi7ial descriptio7i. — "Whorls at least 15, gradually 

 tapering, ornamented as follows: by (i) about seven laterally 

 compressed, oblique subcentral or basal nodes, or costse on each 

 whorl, those on the smaller whorls of the spire not so distinctly 

 defined as represented by the figure; by (2) spiral lines or striae, 

 about five of which are strong and occupy the lower one-third 



