2 Dos 
Opeas pyrgula Schmacker and Boettger 
Shell perforate, small (about 8 mm, long in shells with 7 whorls), elon- 
gate with high tapering spire, the surface sculptured with weak, irregu- 
lar transverse striae or wrinkles. The sutures are crenulated; the 
aperture ovate-lunate; the outer lip thin, not reflected, and rounded; 
columella straight or slightly concave, but not truncated. 
Distribution: Japan, China. 
This species has been found around urban vegetable gardens in Pennsyl- 
vania and Virginia. 
Opeas pumilum (Pfeiffer) 
Piate UH, G 
Shell similar to O, pyrgula in size and shape, but may be distinguished by 
its straight sutures, stronger sculpture, and lip that is strongly retracted 
to the suture. 
Distribution: Tropical America. Introduced in Florida and found in 
greenhouses in Pittsburgh and Chicago. 
Lamellaxis clavulinus (Potiez and Michaud) 
Shell small, very high spired, perforate, moderately glossy and trans- 
versely striate, with straight outer lip and expanded columellar lip. 
Whorls moderately round, sutures straight. The columella is straight or 
sometimes slightly curved, the aperture ovate-lunate, its length 1/4 to 
1/3 the shell length. Adult shells (with 7 whorls) measure about 7 mm. 
Shells of this and related species, such as, L, mauritianus, L. gracilis, 
and L, micra, are very similar to Opeas, but they are placed in a differ- 
ent genus because of details of soft anatomy. None of the shells, however, 
have the lip sharply retracted to the suture as in O, pumilum, and only the 
ribbed L. micra tends to have crenulated sutures like O. pyrgula. 
Distribution: Islands of the Indian Ocean, Japan, Hawaii. Found in Phipps 
Conservatory, Pittsburgh, Pa. 
Lamellaxis mauritianus (Pfeiffer) 
This species is similar to L, clavulinus, but differs from both it and 
L, gracilis by its more glossy surface and weaker transverse striation. 
Distribution: Tropics of both hemispheres in greenhouses and in cultivated 
regions. Found in a number of greenhouses in the United States. 
