EASTERN PROVINCE SOU IHERN REGION SPECIES. 391 



Helix jejuna, Say, Journ. Pbila. Acad., ii, 158 (1821); Bixney's ed., U.— De Kay, N. 



Y. Moll., 46.— Pfeiffer, Mou. Hel. Viv., i, 147.— Bland, Aim. N. Y. Lye, vi, 



:M1 (1H.58).— W. G. Binney, Terr. Moll., iv, 07. 

 Iljlfjrontia jejuna, Tkyon, Am. Jouru. Couch., ii, 308 (1866). 

 IJelix Mobiliana, Binney, Terr. Moll., iii.— W. G. Binney, L. & Fr.-W. Sh., i, fig. 258.. 



A species of the Florida Subregion, found originally near Jackson- 

 ville, Fla.,* received by me from Indian Kiver and Saint Augustine, 

 Fla. ; also near Charlotte Harbor, and noticed as far north as Savannah, 

 Georgia; No Name Key, Florida, H. Hemphill. 



Animal dirty white, neck darker, eye-peduncles black, not quite twice 

 the breadth of the shell, foot pointed. 



Jaw, lingual dentition, and genitalia unknown. 



In revising my work for this manual I have again gone over my col- 

 lection and caiefully compared the specimens of M. Mobilianus and 

 jejunus. I am convinced that they will prove one species. I give here 

 below separately (out of respect to the opinion of my friend Mr. Bland) 

 the descriptions and synonymy of the former. 



Shell globose, perforated, thin, smooth, with very delicate incre- 

 mental striae, horn colored ; whorls 6, convex; suture im- no. 4J6. 

 pressed, last whorl tumid below, globose, slightly descend- 

 ing, deeply constricted behind the peristome, umbilical re- 

 gion scarcely excavated ; apex obtuse; spire elevated ; aper- 

 ture oblique, rounded; peristome thickened, white, reflected, ^•^''''""'""*- 

 its terminations distant, that of the columellar somewhat concealing the 

 perforation. Greater diameter 8J, lesser 6™™ ; height, 5'""'. 



Helix Mohiliaua, Lea, Proc. Am. Phil. Soc, ii, 82 (1841); Traus. Am. Phil. Soc, is, 

 17; Obs., iv, 17 (1H44); iu Tkoschel, Aich. f. Nat., 1843, ii, 124. — Pfeiffek, 

 Mon. Hel. Viv., i, 323; iv, 122.— BlJSTNEY, Terr. Moll., ii, 172, pi. xlii, tig. 2, part. 



Keceived from near Mobile, and from Baldwin, Fla. 



It must be borne iu mind that the iigures in Terr. Moll., Plate XLII, 

 Fig. 2, and Land and Fresh- Water Shells, Fig. 258, are o£ jcjunns, and 

 do not represent Lea's species. 



In M. MoMlianvs there are 6 whorls ; the last whoil is remarkably 

 constricted and gibbous at the ai^erture, more tumid at the base and 

 with smaller umbilicus than mjejunus. The microscopic spiral lines on 

 the embryonic whorls of the latter are absent in the former. The peri- 

 stome at ils junction with the penultimate whorl is sharp, not reflected 

 nor thickened, but elsewhere reflected, thickened by a whitish callus 

 ■within, the edge of which forms a distinct portion of the peristome and 



*The Cow Ford' (not Cowfort) of the Saint John's River given by Mr. Say aathe 

 original locality. 



m^ Hi 



