174 HELICARION. 



H. GUTTA, Pfr. PL 39, figs. 96-98. 



Subglobose, a little depressed above, very thin, smooth, hyaline, 

 highly polished ; suture narrowly margined ; whorls 3^, rapidly 

 enlarging, the last large, depressed-rounded ; columellar margin 

 entering and a little reflected above. Diam. 11, alt. 6 mill. 



Sorsogon, Isl. of Luzon, Philippines. 



H. BICARINATUS, Semper. PI. 39, fig. 99. 



Shell like H. gutta, but somewhat larger. The unique speci- 

 men was broken in extracting the animal. The shell lobes of 

 the animal, each traversed by a submedian carina. 



Ins. Luzon, Philippines. 



H. RUFESCENS, Pfr. PL 39, figs. 100, 1, 2. 



Very thin, plicatulate, shining, pellucid, brownish horn-color, 

 spire depressed conoidal ; whorls scarcely 4, the last ventricose. 

 Diam. 13, alt. 8 mill. 



Mindoro, Philippines. 



H. CRENULARIS, Beck. PL 39, figs. 3-5. 



t 



Very thin, glabrous, shining, pellucid, greenish orange; spire 

 plane; whorls 3J, plicately crenulated towards the suture, rapidly 

 enlarging, the last depressed, base wide. Diam. 13, alt. 7 mill. 



Philippines. 



Var. /9. Slightly larger, the crenulations less distinct. 



H. INCERTUS, Semper. PL 39, fig. 6. 



Imperforate, depressed, semiglobose, very thin, shining, gir- 

 dled with obtuse distant striae, greenish corneous ; spire rather 

 flat, suture crenulated ; whorls 3J, very rapidly increasing, the 

 last rounded; aperture oblique, rounded oval, wider than high ; 

 lip very thin, membranaceous, outer margin a little dilated, colu- 

 mellar margin slightly reflected. Diam. 10'5, alt. 5*5 mill. 



Alpaco, near Zebu, Philippines. 



Unfigured Philippine Island Species. 



H. LUZONICUS, Pfr. ; H. SMARAGDULUS, Beck ; H. HELICOIDES, 

 Semper ; H. RESILIENS, Beck ; H. BICOLOR, Beck. 



