1892.] NATURAL SCIENCES OF PHILADELPHIA. 899 



Jaw stout, Strongly ribbed ; teeth not peculiar, the marginals tri- 

 cuspid. 



Hadra is very closely allied to Chloritis in anatomy and shell, 

 and should probably be considered a subgenus. The groups 

 Papxima and Planispira are also near to Ch/oriiis in anatomical 

 features, and if all were united the group would be about equiva- 

 lent in value to the other groujis herein called genera. A closer 

 study of specimens may, however, show differences not known to 

 me. 



Contrary to the general rule, the presence or absence of a flagel- 

 lum seems to be a character of very trifling import among the spe- 

 cies of the group Chloritis + Hadra -f Papuina -f Planispira; 

 the epiphallus also is lacking in some of the species, notably in 

 Cristigibba. This is a case of degeneration, in all jjrobability, 

 comparable to the Fruticicoloid forms in which the vaginal appen- 

 dages are lost, or to the section Canistrum of Cochlostyla. 



The shells of some species of Chloritis are very like some ofDorca- 



sia, but the anatomical characters very widely separate these two 



groups. 



Subgenus HADEA Alb. 



Genitalia scarcely differing from Chloritis except that the flagel- 

 lum is frequently lacking. Jaw and teeth similar to those of 

 Chloritis. 



These, like the species of Chloritis, are ground snails. 



Distribution, Australia. 



This division I formerly considered a genus, but I agree with my 

 friend Hedley who holds that it is scarcely separable from Chloritis- 



Genus PAPUINA Martens. 



Genitalia: 9 system without accessory appendages ; $ system 

 usually having a flagellum upon the penis, but it is sometimes 

 lacking. Jaw delicate, coarsely ribbed. 



Differs from Hadra in the shell, the exclusively arboreal station, 

 and the more delicate jaw. 



Genus PLANISPIRA Beck. 



Genitalia as in Papxdna, the flagellum being present in typical 

 Planispira (zonaria), absent in sect. Cristigibba. 



Jaw smooth, ribless. 



Differs from Obba in lacking the glandular appendix ; from 

 Papuina, Hadra and Chloritis in the smooth jaw ; but it will prob- 



