128 COCHLOSTYLA-PFEIFFERIA. 



C. MICANS Pfeiffer. PL 19, figs. 12, 13, 14. 



Shell imperforate, subglobular, thin, brittle; translucent-whitish, 

 with an opaque white margin below the suture. Surface shining, 

 obliquely striatulate, obsoletely, finely spirally striated. Whorls 4, 

 the last globose, not descending in front. Aperture a little oblique, 

 lunar ; peristome ihin, fragile and acute, the upper margin curving 

 forward; columella vertical, slightly sinuous, deeply inserted in the 

 base. Alt. 22, greater diam. 26, lesser 22 mill. 



Province of Cagayan, Northern Luzon, Philippines. 



H. micans PFR., P. Z. S. 1845, p. 71 ; Conchyl. Cab. p. 227, t. 28, 

 f. 3-5 ; Monogr. i, p. 24. REEVE, Conch. Icon. f. 46a. P/e?#m'a 

 micans GRAY, P. Z. S. 1853, p. 110. Cochlostyla, micans SEMPER, 

 Reis. Archip. Phil. Landmoll. p. 225. 



The thin fragile lip of this species separates it at once from all 

 other forms of Cochlostyla. 



Semper describes the animal of this interesting species as follows: 

 The border of the mantle-edge all around, in the contracted speci- 

 mens, covers about 1-2 mm. of the shell. On the left there is a 

 small mantle-lappet, but none on the right. 



The foot is broad, flat, without mucus-gland and without middle 

 area to the sole. 



The color of the mantle in the region of the lung is greenish ; the 

 foot and mantle-margin are yellowish. 



The right tentacle passes with its retractor muscle, between the 

 branches of the genitalia, an exception to the rirle in Cochlostyla. 

 The genitalia are just as in Cochlostyla. The receptaculum semi- 

 nis has a long duct, without diverticulum. The dart-sac is globu- 

 lar, thick ; and on the base of the short globule (or mucus) gland 

 there is a small sac, apparently a gland. The vas deferens is wide, 

 and passes gradually into the simple penis, which lacks all acces- 

 sory glands ; the retractor penis is short and thick. 



The jaw has numerous (about 8) pretty wide and close ribs, pro- 

 jecting on the cutting edge. 



The radula is entirely typical of Cochlostyla ; the central tooth 

 has a broad cusp ; there are fourteen or fifteen side-teeth or true 

 laterals ; already the eighteenth tooth being distinctly tricuspid. In 

 all there are 101 teeth in each transverse row. 



