NATURAL SCIENCES OP PHILADELPHIA. 49 



Glandina semitarum, Rang. ( Varicella) . 



Martinique, Governor Rawson. 



Lingual membrane as usual in Glandina. There are about 

 30-1-30 teeth. The central is long and narrow, sharply pointed. 



Glandina Phillipsi, Adams ( Varicella) . 

 Jamaica. 

 Lingual membrane as in last species. 



Helix clausa, Say (Mesodoji). 



Whitley Co., Kentucky. A. G. Wetherby. 



Jaw as usual in the subgenus, with about 10 stout, separate 

 ribs, denticulating either margin. 



Lingual membrane long and narrow. Teeth about 41-1-41. 

 Centrals and laterals (about 11 of the latter), as usual in the sub- 

 genus (see fig. of those of H. Sayi, L. and Fr. w. Shells, I. 154, 

 fig. 265). Marginals quadrate, with one extremely long, oblique 

 denticle, as in H. thyroides (1. c. fig. 252, p. 148). Some of the 

 extreme marginals are notched or obsoletely bifid at their point. 



The penis resembles that of H. thyroides as figured by Dr. 

 Leidy in Terr. Moll. U. S., I. 

 Helix Downieana, Bland (Mesodon) . 



Whitley Co., Kentucky. A. G. Wetherby. 



Jaw ribbed as usual in the subgenus. Lingual membrane as 

 usual in the subgenus (see fig. 265 of L. and Fr. w. Shells, N. A., 

 I). Marginals with one long, oblique, bluntly bifid inner denticle, 

 and two short, blunt outer denticles. 

 Helix Wetherbyi, Bland {Mesodon). 



Whitley Co., Kentucky. A. G. Wetherby. 



Jaw and lingual membrane as usual in the subgenus (see ante, 

 H. clausa), the former with about 18 ribs, the latter with mar- 

 ginals peculiar for the great development of the inner blunt den- 

 ticle, the outer being short and blunt. Plate V., fig. 17, 18. 



Helix Edvardsi, Bland (Stenotrema). 



Whitley Co., Kentucky. A. G. Wetherby. 



Jaw as usual in the subgenus (see L. and Fr. w. Shells, N. A., 

 I), with about 13 broad, crowded ribs, denticulating either margin. 



Lingual membrane as in H. hirsuta (1. c. 119, fig. 191). Cen- 

 trals tricuspid, laterals bicuspid, marginals wide, low, with one 

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