148 Notes on certain Terrestrial Molluslcs. 



On receipt of some of the shells I submitted them to Mr. J. 

 H. Redfield, who determined the species. 



Benson, in Ann. and Mag. of Nat. Hist., Vol. iv., 2d series, 

 (1849), mentions that the beautiful vermilion and yellow tints 

 (seen through the shell, which is diaphanous and colorless), first 

 attracted his attention to the animal in Bundelkhund in 1825, 

 and that he subsequently took it at the foot of the Himalayas, 

 in Rohilkhund ; in the Do-ab of the Ganges and Jumna ; at 

 Jounpore and Mirzapore, in the Benares division, north and 

 south of the Ganges ; and on the west bank of the Hooghly 

 river, near Calcutta. In 1847 he met with it at Point de Galle 

 in Ceylon, and Dr. Cantor found it, though rarely, in Pulo 

 Penang. Benson did not collect it at the Mauritius, though 

 Pfeiffer ascribes it (P. Largillierti Phil.), on the authority of 

 Largilliert, to the Isle of Bourbon. 



Benson says that Papa bicolor " shelters itself in the ground 

 under the loose stones, bricks, or wood." At Bhamoury, he got 

 it " by digging at th.e root of a tree." The station of the species 

 is the same in St. Thomas. 



Pupa bicolor belongs to Ennea, a subgenus of Pupa, propos- 

 ed by H. and A. Adams in their Genera of Molluslcs. Pfeiffer, 

 in Malak. Blatt., 1855, enumerates 22 species, of which 14 in- 

 habit Africa and adjacent islands, including Madagascar, — 4 

 the East Indies and Ceylon, — the habitat of the remaining 4 

 being unknown. 



The occurrence of this species in the Island of St. Thomas, 

 W. I., is extremely interesting. Hitherto it has only been 

 known as having the wide distribution in the East, described 

 by Benson, and it belongs to a subgenus (founded on the cha- 

 racters of the shell) not otherwise represented in the Western 

 Hemisphere. 



Under these circumstances, and considering the recent dis- 

 covery of the species in a limited area near the town and har- 

 bor of St. Thomas, I can only look upon it as having been 

 accidentally introduced by the agency of man. 



