NESOPUPA. 



227 



lamella and its connection with the peristome by a callus 

 (though very slight), are characters of the Ptychakea-Neso- 

 pupa series. It is not an Afripupa. I have suspected that it 

 might be referable to PtychaUra; the shape and gloss of the 

 smooth shell, the biarcuate outer lip and the arrangement of 

 teeth all favor this view. But if it belongs to Ptychalcra, it 

 has lost the special character of that group — the very strong 

 connection of angular lamella with peristome. For the pres- 

 ent, therefore, it is left in Nesopupa. 



Section Nesopuparia n. sect. 



Large Nesopupas of conic shape with a long umbilical 

 suture ; aperture about as in Nesopupa proper. Type N. nor- 



folkensis (Sykes). 



Nesopupa norfolkensis (Sykes). PI. 29, fig. 16. 

 Vol. XXV, p. 333. 



The conic-ovate, sinistral shell has a minute perforation 

 and long umbilical rimation. Sculpture of delicate, very ob- 

 lique, partly epidermal riblets, worn off in front of the aper- 

 ture. Under the microscope the intercostal spaces are seen 

 to be minutely roughened as by shallow, irregularly anasto- 

 mosing pits. Isabella-colored, somewhat gleaming. The whorls 

 are moderately convex, the last without impressions back of 

 the lip, rounded basally. The aperture has 8 teeth. Angular 

 lamella strong, curved, joining the outer lip. Parietal lamella 

 is more immersed, straight. There is a minute tubercular or 

 oblong infraparietal lamella. The columellar lamella is nearly 

 horizontal, but ascends slightly as it enters. The basal fold 

 is small and short, subcolumellar in position. Lower-palatal 

 fold decidedly larger than the upper; above the latter is a 

 small, tubercular suprapalatal fold. The lips are well ex- 

 panded, thin, colored like the shell, their insertions remote. 



Length 3.85, diameter above aperture 2.1 mm. ; 5% whorls. 



Norfolk Island, on bark of Dracena. 



