HELIX-PAPUINA. 7 



H. AMBROSIA Angas. PI. 4, figs. 75, 76, 77. 



Imperforate, turbinate, rounded at the periphery, having a broad- 

 dark-brown band above (often split into two bands) which is macu- 

 lated with angular patches of opaque white ; base either, unicolored 

 deep brown or having a brown band below the periphery ; lips 

 white. 



The spire is conical, apex whitish, obtuse; whorls 5 5, slightly 

 convex, the last a little descending in front. Surface smooth, shin- 

 ing, lightly striatulate. There is a narrow white border below the 

 suture, a wide white girdle at the periphery, and usually the broad 

 blackish-brown band on the upper surface is split into two by a 

 white zone. , The base is either unicolored blackish-brown, or is 

 white shading into brown below a dark band. Aperture oblique, 

 subrhombic, dark within ; the face and reverse of the narrowly ex- 

 panded lip are white. The columella is oblique, wide, subtruncate 

 below. 



Alt. 24, greater diam. 20, lesser 18 mill. 



Alt. 19, greater diam. 18, lesser 16 mill. 



Galera (" Sava" or "Russell's Jd.") and Ysabel Is., Solomon 

 Group. 



Geotrochus ambrosia ANGAS P. Z. S. 1867, p. 889, t. 43, f. 9, 10. 

 Helix ambrosia PFR. Monogr. vii, p. 210. DOHRN, Conchyl. Cab. 

 p.|571, t. 168, f. 12, 13. BRAZIER, Journ. de Conchyl. 1880, p. 302. 

 H. ramsdeni ANGAS, P. Z. S. 1876, p. 266, t. 20, f. 6, 7. 



The pellucid epidermis forms angular spots on the dark bands, 

 as in many Philippine Island Cochlostylas. 



The form called H. ramsdeni by Angas is slightly larger, but has 

 no constant diiferences. The specimen before me (typical in form 

 and color), measures, Alt. 25, greater diam. 24, lesser 20 mill. 



On PL 16, fig. 19, represents Angas' type of ramsdeni, and 

 fig. 16, the smallest specimen of ambrosia in the suite of sixteen 

 specimens before me. 



H. MALANTENSIS Angas. PI. 16, figs. 17, 20, 21, 22. 



Imperforate, elevated turbinate, the spire conical, apex obtuse ; 

 whorls 5, slightly convex, the earlier 3 unicolored waxen-white, 

 the last whorl rounded at the periphery, a trifle descending in front. 

 Surface smooth, shining, lightly striatulate. Color creamy-white, 

 variously zoned with wide and narrow bands of dark brown and 

 tawny. 



