26 THE NAUTILUS. 



are one or two of the rarer species of Spiraxis described by Adams 

 that are suggestive of Ravenia. An examination of the types of 

 these may necessitate their removal from Spiraxis. 



Note. I am inclined to believe that the relation between the 

 Jamaican Glandinas and the various genera of Stenogyra found ia 

 the same island is much closer than supposed. Often the dividing 

 line between Ope as, Subulina and Varicella is annoyingly close. It 

 is to be regretted that a comparative anatomical study of the Glan- 

 dina and Stenogyra in Jamaica has never been made. 



LAND SHELLS OF GTJN CAY, BAHAMAS. 



BY HENRY A. PILSBRY. 



Gun Cay is a tiny islet on the extreme western border of the 

 Bahama group. It is low, with very scant vegetation " a few 

 scattered specimens of cactus, wild grapes, wild geraniums and ver- 

 bena " with the usual Bahaman shore plants. There is a light- 

 house, but no settlement. 



Dr. Wm. H. Rush, U. S. N., some years ago collected there the 

 following species : 



1. Ctenopoma bahamense Shuttl. ? One very young specimen. 



2. Cepolis (Hemitrochus^) sp. (young ; rib-striate, like C.filicosta 



Pfr.). 



3. Thysanophora vortex Pfr. 



4. Cerion incanum Biuney. Basal volution more distinctly cos- 

 tate than in Key West examples. 



5. Cerion Pillsburyi Pilsbry & Vanatta. 1 A new form resembling 

 C. regina, but with narrow umbilical area. It is named at the re- 

 quest of Dr. Rush, in honor of Lieutenant-Commander John Elliott 

 Pillsbury, of the U. S. Coast Survey steamer " Blake." 



6. Cerion glans Kiister, var. 



The only previous record from this islet is in Bull. Mus. Comp. 

 Zool., vol. xxv, no. 9, p. 119, 1894, where Dall enumerates three spe- 

 cies collected by Prof. A. Agassiz : Cerion cinereum, C. pannosum 

 and Cepolis (Hemitrochus') Troscheli. The young Hernitrochus 

 taken by Dr. Rush may be an immature Troscheli, but it is more 

 strongly ribbed than usual in that species. 



described in Proc. Acad. Nat. Sci., Phila., 1897, p. 366. 



