COCHLOSTYLA OF MINDORO PROVINCE 447 



1868. Helix jonasi Pfeiffer, Monographia heliceorum viventium, vol. 5, p. 267. 

 1868. Bulimus leai Pfeiffer, Monographia heliceorum viventium, vol. 6, p. 8. 



1876. Helix jonasi Pfeiffer, Monographia heliceorum viventium, vol. 7, p. 578. 



1877. Cochlostyla jonasi Semper, Reisen im Archipel der Philippinen, pt. 2, vol. 



3, p. 188. 

 1877. Cochlostyla leai Semper, ibid., pt. 2, vol. 3, p. 212. 

 1887. Cochlostyla leai Hidalgo, Journ. Conchyl., vol. 35, p. 152. 

 1887. Cochlostyla jonasi Hidalgo, ibid., p. 189. 

 1892. Cochlostyla leai Pilsbry, Man. Conch., ser. 2, vol. 8, p. 32, pi. 17, figs. 33, 



34. 

 1892. Cochlostyla jonasi Pilsbry, ibid., pp. 32-33 (in part), pi. 17, figs. 32, 33; 



pi. 37, figs. 43, 44. 

 1895. Helicostyla leai Pilsbry, Man. Conch., ser. 2, vol. 9, p. 229. 



1895. Helicostyla jonasi Pilsbry, ibid., p. 229. 



1896. Cochlostyla leai Elera, Catalogo sistematico de toda la fauna de Filipinas, 



vol. 3, p. 603. 



1896. Cochlostyla jonasi Elera, ibid., p. 603; in part. 



1897. Cochlostyla jonasi Hidalgo, Journ. Conchyl., vol. 44, pp. 245, 257, 279, 



290, 331, 332, 341, 347, 351. 



1897. Cochlostyla leai Hidalgo, ibid., pp. 292 (in part), 329, 338, 349, 350. 



1898. Cochlostyla jonasi Mollendorff, Abh. Naturf. Ges. Gorlitz, vol. 22, p. 



131; in part. 

 1911. Cochlostyla jonasi Mollendorff, Kobelt, and Winter, Semper's Reisen 



im Archipel der Philippinen, vol. 10, pt. 1, pp. 251-252 (in part), pi. 51, 



figs. 8, 8a. 

 1932. Cochlostyla (Eudoxus) jonasi Bartsch, Journ. Washington Acad. Sci., vol. 



22, p. 338. 



The shell is very broadly ovate, covered by a thin pale straw-col- 

 ored periostracum. The early whorls are a little paler than the last. 

 The interior of the aperture is bluish white, which is also the color of 

 the peristome and columella. Nuclear whorls 2.1, strongly rounded 

 and marked by rather coarse incremental lines and on the last half 

 turn by fine spiral striations. The postnuclear whorls are somewhat 

 inflated, well rounded, appressed at the summit, and marked by decid- 

 edly obliquely curved incremental lines, which on the appressed por- 

 tion at the summit are very finely denticulated. In addition to this, 

 the entire surface of the spire is marked by scarcely perceptible, closely 

 spaced, microscopic, spiral striations. These I have been unable to 

 observe on the base. Suture feebly constricted; periphery inflated, 

 strongly rounded. Base short, strongly rounded with an impression 

 at the insertion of the columella, which almost causes it to appear as 

 if umbilicated. The aperture is subcircular; the outer lip is slightly 

 expanded and reflected, while the columella is rather broad, some- 

 what excavated, terminating anteriorly in a denticle a little posterior 

 to its junction with the outer lip. The columella is surrounded by a 

 thin callus, which also extends over the parietal wall. 



The specimen described and figured is one of two (U.S.N.M. no. 

 309459) that come from the Redfield collection, having probably 



