380 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Foot without pedal margination; a small left body-lappet often developed; 

 kidney elongated. 



Jaw ribbed. 



Radula with bluntly pointed or truncated mesocones on middle and lateral 

 teeth, without trace of side cusps. Marginal teeth having the entocone indicated 

 by a split in the broad inner cusp, a small simple ectocone being developed. 



Genital system: Penis moderately long, passing into an epiphallus which bears 

 the retractor; flagellum wanting. Dart sack short and globose, seated on atrium 

 or low on vagina, bearing an accessory sack into which the mucus gland opens. 

 Mucus gland globular or oval, with a very short duct, its thick wall composed of 

 radially arranged follicles. Dart short, straight, and round in section. Sperma- 

 theca oval, on a long, branchless duct. 



Cochlostylas are arboreal. The genus is almost wholly Philippine; 

 a few species extend into Borneo, south to New Guinea, Moluccas, 

 and the Solomon Islands. The genus has been divided into a host 

 of subgenera or groups, a few of which, usually small aggregates, have 

 quite distinctive characters, but most of them have members that 

 represent bridging elements, which could be placed with equal claim 

 in either of two of these groups. These subgroups, however ill denned 

 they may appear to be, serve a useful purpose in a classificatory 

 arrangement, and it is for that reason chiefly that most of them 

 deserve retention. 



Subgenus Corasia Albers 



In this subgenus the shell is depressed helicoid or lenticular, im- 

 perforate, usually with a more or less conspicuous peripheral keel. 

 The outer lip is but slightly expanded and reflected. The periostra- 

 cum is not hydrophanous. 



Type: Cochlostyla (Corasia) virgo (Broderip). 



A single species only, Cochlostyla (Corasia) aegrota (Reeve), is known 

 from the Mindoro Province. 



COCHLOSTYLA (CORASIA) AEGROTA (Reeve) 



Plate 94, Figures 1-3 



1851. Helix aegrota Reeve, Conchologia iconica, pi. 22, fig. 95. 



1853. Helix aegrota Pfeiffer, Monographia heliceorum viventium, vol. 3, pp. 



191-192. 



1854. Helix aegrota Pfeiffer, Martini-Chemnitz Conchylien Cabinet, ed. 2, vol. 



1, Abt. 12, Theil 3, pp. 437-438, pi. 152, fig. 3. 

 1856. Helix (Corasia) aegrota Pfeiffer, Malakozool. Blatter, vol. 2, p. 144. 



1859. Helix aegrota Pfeiffer, Monographia heliceorum viventium, vol. 4, p. 214. 



1860. Corasia aegrota Martens, Albers, Die Heliceen, ed. 2, p. 171. 



1868. Helix aegrota Pfeiffer, Monographia heliceorum viventium, vol. 5, p. 258. 

 1876. Helix aegrota Pfeiffer, Monographia heliceorum viventium, vol. 7, p. 328; 



in part. 

 1890. Cochlostyla aegrota Hidalgo, Obras malacologicas, p. 152; in part. 

 1890. Cochlostyla aegrota Mollendorff, Ber. Senckenberg Naturf. Ges., 1890, 



pp. 230-231; in part. 



