200 CALCEOLA. 



5. luoidum (pi. 256, f. 49, 50), A Ad. — Testa oblique ovata, 

 depressa, superne couvexa, inferne planiuscula, alba, laevis, pel- 

 lucida, striolis increments obsolete radiata ; umbilico callo piano 

 subcirculari opaco obtecto ; anfractibus rapide crescentibus, ulti- 

 mo ascendente, alios involvente usque ad apicem ; apertura sub- 

 horizontali, depressa, antice producta. Obs. This species differs 

 from the others already described in being smooth and pellucid ; 

 the last whorl is also considerably more dilated anteriorly. 



6. ahplectans (pi. 256, f. 51, 52), Cpr. — Testa parva, alba, 

 planata, tavis, peritremate rotundata ; callositate spirali, umbilicum 

 tegente, labium versus subplauata, supra parietem intus suturam 

 decurrente ; apertura rotundata ; labro supra aufractum penulti- 

 muin reflecto ; sutura haud impressa. Obs. In this species the 

 aperture is produced and angular, the callus covering the umbi- 

 lical region is very large and thick, and the shell is very flat 

 above. 



7. substriatom (pi. 256, f. 53, 54), Cpr. — Testa minima, 

 planata, opaca, alba, subnitente ; striolis spiralibus, prope suturam 

 impressam monstrantibus ; callositate angustissima, longiore, circa 

 rimam umbilicalem gyrante, prope labium vix planato; apertura 

 rotundata; labio solido, anfractus penultimos haud amplectante. 

 Obs. There are a few spiral striae near the suture in this species, 

 the callosity is very long and narrow, and the aperture is nearly 

 circular. 



Subgenus Calceolina, A. Ad. 



Shell neritiniform, oblong, depressed; spire small; whorls 

 rapidly increasing, umbilical region callous; aperture semicir- 

 cular ; inner lip with a large wide callus, covering posteriorly the 

 umbilicus; margin of the callus straight, simple. 



1. posilla (pi. 256, f. 55, 56), C. B. Ad.— Testa albida, sub- 

 opaca, superficie rugulis incrementi confertissimis striata ; sutura, 

 valde impressa ; anfractu ultimo depresso, magno, ad peripheriam 

 compresso. Obs. The specimens of this peculiar form, brought 

 by me from Japan, do not seem to differ in any respect from the 

 Neritina pusilla of C. B. Adams. The neritiniform aspect and 

 straight inner lip cause it at once to be separated from the other 

 species of Telnostoma. 



