434 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



1895. Helicostyla turbo Pilsbry, Man. Conch., ser. 2, vol. 9, p. 227. 



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



vol. 3, p. 590; in part. 



1897. Cochlostyla turbo Hidalgo, Journ. Conchyl., vol. 44, pp. 253, 254, 272, 321, 



330, 331, 332, 333, 341, 347, 351. 



1898. Cochlostyla turbo Mollendorff, Abh. Naturf. Ges. Gorlitz, vol. 22, p. 135; 



in part. 

 1901. Cochlostyla turbo Hidalgo, Obras malacologicas, pp. 355-356; in part. 

 1912. Cochlostyla (Rhymbocochlias) turbo Mollendorff, Kobelt, and Winter, 



Semper's Reisen im Archipel der Philippinen, vol. 10, p. 268; in part. 

 1932. Cochlostyla (Helicobulinus) turbo Bartsch, Journ. Washington Acad. Sci., 



vol. 22, p. 337. 



Shell imperforate, top-shaped, rather solid, obliquely distinctly 

 striated, pale flesh-color, covered in part with a thin evanescent yellow 

 periostracum. Spire regularly conic, gradually tapering toward the 

 obtuse apex. Whorls 5, flat, the last rather large, angulated at the 

 periphery, where it is marked by a chestnut-brown band. The base 

 slopes conspicuously from the periphery, which is only slightly arched. 

 The columella is almost vertical, straight, broad, flat, and white. The 

 aperture is almost diagonal to the axis of the shell and is of irregular 

 lunate form, pearly white within. The peristome is somewhat ex- 

 panded and reflected backward at its junction with the columella, 

 forming there a small rimation. 



Length, 35 mm; greater diameter, 43 mm. 



Habitat: Island of Mindoro. 



Of the figure that Pfeiffer published in Martini-Chemnitz Conchy- 

 lien Cabinet, p. 287, pi. 48, figures 1 and 2, which we here reproduce, 

 he says: "The notch which the artist who drew the figure reproduced 

 all too accurately in his drawings is merely an accidental monstrosity." 



I have not seen this species. 



Subgenus Orthostylus Beck 



In this subgenus the shell is large, solid, and ovate-conic. It is 

 covered with a hydrophanous periostracum that presents much varia- 

 tion in thickness and color in the different species of the group. The 

 aperture is ovate and oblique and the peristome moderately expanded 

 and reflected. The columella is almost vertical and more or less 

 folded. 



Type: Cochlostyla (Orthostylus) pithogaster (Ferussac). 



COCHLOSTYLA (ORTHOSTYLUS) EUCONICA Bartsch 



Plate 100, Figure 3 



1932. Cochlostyla (Orthostylus) euconica Bartsch, Journ. Washington Acad. Sci., 



vol. 22, p. 337. 



1933. Helicostyla (Orthostylus) pithogaster Clench and Archer, Papers Michigan 



Acad. Sci., Arts, Letters, vol. 17, p. 543. 



