74 



THE NAUTILUS. 



I have examined " rubbish" from over 20 of them from Key 

 Biscayne to Garden Key, Dry Tortugas; and while I found over 

 60 species of land shells, there was not even a fragment of 

 Carychium, and it is not mentioned in any of Pilsbry's published 

 lists of Key shells. 



Types from Snapper Creek Hammock, No. 8569 of my col- 

 lection. 



Thysanophora macneilli n. sp. PI. 8, fig. 1. 



Shell small, globose, with about four well-rounded whorls, 

 suture deep; color chestnut-brown, somewhat shining; surface 

 with faint growth lines and microscopically granulated; apex 

 obtuse, large, more densely granulated than the body of the 

 shell; widely umbilicate with the umbilicus extending to the 

 apex and contained about 5 times in the diameter of the shell. 

 Aperture well rounded slightly oblique, lip thin, partly reflected 

 around the umbilicus. 



The type measures alt. 1.50, diam. 1.38, umbilicus 0.29 mm. 



Types, fig. 1, from Magazine Point, 8 miles north of Mobile, 

 Ala., No. 8572 of my collection. Also found at Spring Hill 

 and along the Fowl River about 3 miles from the coast in the 

 southern part of Mobile Co. 



This species is named after the late L. H. McNeill of Mobile, 

 Ala., who first found it in 1914. Mr. McNeill, although handi- 

 capped by poor health, was an enthusiastic collector and added 

 much to our knowledge of the molluscan fauna of southern 

 Alabama. 



There are two species found in Florida, and probably others 

 of the Gulf states, with which this species may be confused. 

 From T. dioscoricola (C. B. Ad.) it differs in the wider umbili- 

 cus, less oblique aperture and in having about \ whorl more in 

 the same diameter. 



T. caeca (Guppy) is a larger, more depressed shell, subangular 

 at the periphery, umbilicus nearly covered, and surface with 

 distinct spiral sculpture. 



Explanation of Plate 8. 

 Fig. 1, T. macneilli Clapp X 16.6, alt. 1.50, diam. 1.38 mm. 



