390 Hans KLEINSTEUBER, 
Sie sind als epipodiale Bildungen aufzufassen. An der rechten 
Körperseite tritt aus der Mantelhöhle ein Bündel von Kiemen- 
blättchen hervor, die am Ende leicht verdickt erscheinen (Text- 
fie. A u. Bk). Männliche Tiere zeigen hinter dem rechten Fühler 
den nicht einstülpbaren Penis. 
Tryon macht für die von mir bearbeiteten Arten folgende Be- 
stimmungsangaben: 
Genus Calyptraea. 
Shell conical, trochiform, with central, spiral apex, aperture basal, 
cireular, entire; interior furnished with a spiral diaphragm, the colu- 
mellar margin of which is twisted, forming a false umbilicus, free 
margin convex. 
The animal has a short head, the muzzle bilobed, tentacles 
rather short, eylindrical, with the eyes on tubercles at their exterior 
base; foot short, rounded, obtuse behind, angular in front. 
Calyptraea sinensis Linn. 
Orbieular, thin, smooth or finely scaled, shining within; white 
or yellowish white. 
Europe. 
It is: CO. vulgaris Puın., ©. squama DESH., (. laevigata Lam., C. muri- 
cata CosTA, (. spinulosa CHENU, Trochita sinensis REEVE, Calyptr. 
chinensis FLEMING, (. sinensis DESHAYES, besides a numbre of fossil 
synonyms. 
Calyptraea celypeolum. 
Rather thin, smooth, with growth-lines; whitish, becoming pur- 
plish or brownish on the spire, the mamillary apex brownish; interior 
light brownish or violaceous. 
Valparaiso, Panama etc. 
The synonymy includes: (. solida REEVE, C©. mamillaris BRoD., C. lamarckü. 
Subgenus Trochita SCHUM. 
Calyptraea radians Lam. 
Orbieular, depressed, or elevated radiately subnodulously ribbed; 
whitish or yellowish white, under a yellowish brown fibrous epi- 
dermis, interior white, more or less stained with chocolate, the 
septum white. Diam. 2—3 inches. 
Peru, Chili. 
Synonyms are: Cal. peruviana DESH., (. trochiformis GMEL., ©. araucana 
Lesson, 0. sordida BROD., C©. corrugata REEVE. 
