92 COCHLOSTYLA. 



H. tennis PFR., P. Z. S. 1845, p. 41 ; Monogr. i, p. 24 ; Conchyl. 

 Cab., t. 157, f. 5, 6. REEVE, Conch. Icon.,f. 759. H. (Eury crater a) 

 tennis PFR., Nomencl. Hel. Viv., p. 169, 1878. 



A species known only by Pfeiffer's and Reeve's descriptions and 

 figures. 



Genus COCHLOSTYLA Ferussac, 1819. 



Cochlostyla FERUSSAC, Tab. Syst. des Anim. Moll. Prodr. gen., p. 

 47, 1819. PFR., Symbolse i, p. 21. v. MARTENS, in Albers, Die 

 Heliceen 2d. edit., p. 173 ; Preuss. Exped. Landmoll., p. 96. 

 SEMPER, Reis. Archip. Phil., p. 164. 



COCHLOSTYLA includes Chlorcea, Corasia, Axina, Pfeifferia, Calo- 

 cochlia, Helicostyla, Orustia, Cochlodryas, Orthostylus, Helicobulimus, 

 Ptychostylus, Phengus, Eudoxus, Hypselostyla, Canistrum, Prochilus, 

 Chrysallis, Phwnicobius. 



Shell varying from depressed, Helicoid, to elongated and Bulimi- 

 form, usually imperforate ; rounded at the circumference or keeled ; 

 the lip generally reflexed (rarely simple and acute) ; usually covered 

 with a thin, transparent cuticle, often porous in places, when it be- 

 comes white and opaque, producing the " hydrophanous " patterns 

 with which most of the species are ornamented. 



The species are with few exceptions confined to the Philippine 

 Archipelago. They are mainly arboreal in habit. 



The species, however diverse in form of the shell, agree in 

 anatomy. There are no accessory appendages to the male genital 

 system ; the female system has a single mucus gland, globular or 

 oval in shape, which combines with the sac of the simple stylet- 

 formed dart. The duct of the receptaculum seminis is long. The 

 jaw has strong ribs. 



Diverse as the shells assembled in this genus at first appear, it is 

 without doubt a perfectly natural group. The extreme forms are so 

 closely connected by intermediate species that no satisfactory groups 

 of subgeneric rank can be defined. 



The system of sections or groups briefly sketched by v. Martens 

 (Ostas. Zool., p. 96), and improved by Semper (Phil. Archip. Land- 

 moll.) is in my opinion the most natural yet proposed. I have, 

 therefore, in the following pages followed the same general arrange- 

 ment and sequence of groups ; but not without modifying them 

 materially as to contents and limits, and adding several groups to 

 the already large number. In the system herein set forth, the species 



