192 BULLETIN OF THE 



latter Andrewsi. The latter species must also be recognized as subject to 

 variation, rendering it in some cases difficult to separate from major, never 

 from the large variety of albolabris. 



The original specimen of major of the Terrestrial Mollusks was included in 

 the collection given by Mr. J. S. Phillips to the Philadelphia Academy of 

 Sciences. The points in which it differs from the large form of albolabris are 

 pointed out in Terrestrial Mollusks, Vol. II. p. 98. 



Mesodon multilineatus, SAY. 



Pennsylvanicus, GREEN. 



Mitchellianus, LEA. 



elevatus, SAT. 



Clarki, LEA. 



Christyi, BLAND. 



exoletus, BINNET. 



Wheatleyi, BLAND. 



dentiferus, BINNEY. 



In a specimen collected by Mr. Hemphill, at Banner's Elk, N. C., I found the 

 retractor muscle of the penis sac near its junction with the vas deferens, not 

 at half the length of the latter. There was no constriction to the penis sac. 



Mesodon Wetkerbyi, BLAND. 

 thyroides, SAY. 

 clausus, SAY. 

 Downieanus, BLAND. 

 Lawae, LEWIS. 

 profundus, SAY. 

 Sayi, BINNEY. 



Pupa pentodon, SAY. 



The enlarged view of the aperture gives on the left P. Tappaniana, on the 

 right P. curvidens. 



Under the name of Pupilla Floridana, Mr. Dall has described what I con- 

 sider as a form of this species in Proc. U. S. Nat. Mus., 1885, p. 251, Plate 

 XYII. Fig. 11. 



Shell greenish spermaceti-white ; when living, the tissues of the animal show 

 with pale salmon-color through the shell in the apical whorls ; surface smooth or 

 lightly striated, with a tendency to retain dirt upon itself; form subcylindrical, with 

 a rather obtuse apex, the last whorl forming nearly half the shell ; suture evident ; 

 whorls five, neatly rounded ; aperture longer than wide ; lip white, thin, reflected ; 

 teeth about nine, of which there are generally three larger than the rest, their tips 

 nearly meeting, and their bases mutually nearly equidistant ; one is on the pillar, 

 one on the body whorl, and one on the anterior margin ; on either side of the latter 

 are two generally subequal much smaller denticles. Lon. l.GO, lat. 0.75 mm. 



