446 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Mr. de Mesa collected these specimens at Binacas, Lubang Island. 

 Binacas is on the northwest coast of the island and about one-third 

 of the distance from its northern end to the southern end, south of the 

 northern end. Most of the other races so far known from this island 

 have come from the east coast. It is remarkably uniform in shape 

 and coloration. I take it that the albinos described by authors in 

 the past have merely lost part of the hydrophanous color bands of the 

 periostracum at the periphery and at the summit, a loss that would 

 render them practically pure white. The absence of a dark umbilical 

 area is a very characteristic feature of this race. 



Subgenus Eudoxus Albers 



In this subgenus the shell is usually thin, ovate to ovate-conic, and 

 covered by a very thin periostracum. The peristome varies from 

 slightly to considerably expanded and reflected, and the columella is 

 slightly excavated. 



Type: Cochlostyla (Eudoxus) effusa (Pfeiffer). 



COCHLOSTYLA (EUDOXUS) JONASI (Pfeiffer) 



Plate 101, Figure 7 



1846. Helix jonasi Pfeiffer, Proc. Zool. Soc. London, 1845, p. 126. 



1846. Bulimus leai Pfeiffer, Proc. Zool. Soc. London, 1846, p. 29. 



1848. Helix jonasi Pfeiffer, Monographia heliceorum viventium, vol. 1, p. 225. 



1848. Bulimus leai Pfeiffer, Monographia heliceorum viventium, vol. 2, p. 9. 



1849. Bulimus leai Reeve, Conchologia iconica, pi. 12, fig. 66. 



1850. Helix jonasi Pfeiffer, Martini-Chemnitz Conchy lien Cabinet, ed. 2, vol. 



1, Abt. 12, Theil 1, p. 298, pi. 50, figs. 5, 6. 



1851. Helix jonasi Reeve, Conchologia iconica, pi. 26, fig. 113. 



1853. Bulimus leai Pfeiffer, Monographia heliceorum viventium, vol. 3, p. 300. 

 1853. Bulimus jonasi Pfeiffer, ibid., p. 172. 



1855. Helicostyla jonasi H. and A. Adams, The genera of recent Mollusca, vol. 2, 



p. 192. 



1856. Bulimus leai Pfeiffer, Malakozool. Blatter, vol. 2, p. 146. 



1859. Bulimus leai Pfeiffer, Monographia heliceorum viventium, vol. 4, p. 361. 

 1859. Helix jonasi Pfeiffer, ibid., p. 198. 



