38 COCHLOSTYLA-EUDOXUS. 



reflexed, pure white or reddish, rarely purplish-black ; columella 

 vertical white. 



Alt. 60, diam. 37 mill. 



Alt. 52, diam. 33 mill. 



Eastern Mindanao, Philippines. 



Bui. smaragdinus Rv., P. Z. S., 1842, p. 49 ; Conch. Syst. ii, 1. 173, 

 f. 6 ; Conch. Icon., Bui., t. 6, f. 27. DESK, in Fer., Hist., t. 110 B, 

 f. 5. PER., Conchyl. Cab., p. 207, t. 58, f. 5-7 ; Monogr. ii, p. 29.- 

 Cochlostyla (Eudoxus) smaragdina SEMPER, Reisen im Archip. 

 Phil., Landmoll., p. 213, t. 13, f. 19 (Anat.). HIDALGO, Obras 

 Malacol., t. 58. 



Semper has found this species to be extremely variable. He 

 recognizes varieties as follows : 



1. Typical smaragdina, in which the shell is smooth and glossy, 

 green or greenish-yellow, the spire either white or reddish. 



2. Var. nigrescens. In this form the rose of the earlier whorls 

 changes into dark reddish-brown ; the emerald-green into black- 

 green or even black-brown. In a few examples distinct darker and 

 lighter spiral bands may be seen, and generally the base is darker 

 than the upper portion. The specimen from Bislig shows a wide 

 greenish-black baud on the last whorl, between two narrower yel- 

 lowish-brown-green ones; the columellar tract is dark greenish- 

 black, and under the white sutural band there are a few alternately 

 darker and light spiral stria?. The peristome is either white or 

 reddish dark red-brown. Localities are Lianga, Tandag, Bislig, 

 on the east coast, Suribao and Caguait in the valley of the Agusan. 



3. Var. lutea. Unicolored ocher or straw-yellow, the spire white 

 or reddish ; showing upon the last whorl more or less developed 

 traces of hydrophauous yellow cuticle ; where this is absent the sur- 

 face has the luster of the typical form, but when the cuticle is 

 largely present the shell is dull, and these examples, which occur in 

 the Agusan drainage, are usually smaller and compressed. The 

 smallest measures, alt. 40, diam. 30, aperture 21 mill, long, 14 wide. 

 The extremes are connected closely with the typical form. Some 

 specimens have a violet-black lip, forming a transition to C. a'gle. 

 Localities are: Bislig, Higaquit, on the east coast of Mindanao ; 

 Dapa on Siargao (Sts. of Surigao) ; Mainit and S. Juan de Surigao, 

 on the lower course, Agusan, Monte-Pasian and Monte-Kin uta, on 

 the upper course of the Rio Agusan. 



