264 AMASTRA, MOLOKAI. 



spots of deeper shade. Tentacles short, stout, very dark 

 brown ' ' (Baldwin) . 



" The formula of dentition is 28.1.28. The marginals take 

 a peculiar form " (Gwatkin). 



Molokai: Kamelo (Baldwin); Makolelau and Waiakapuaa 

 (Meyer). 



Amastra umbrosa BALDWIN, Proc. A. N. S., Phila., 1895, p. 

 229, pi. 11, figs. 36, 37. BORCHERDING, Zoologica, xix, p. Ill, 

 pi. 10, figs. 9, 10. Achatinella umbrosa THWING, Orig. De- 

 scriptions, etc., p. 163, pi. 3, f. 22. 



This form is closely related to A. pullata (with which Sykes 

 unites it as a local form) , but the embryonic shell, especially 

 the second whorl, is less strongly plicate in umbrosa, and does 

 not show the keel above the suture ; the adult is more inflated 

 than typical pullata, but not more than the obese variety; 

 finally, the color of the animal is different. It seems to be a 

 local race of pullata. Borcherding affirms the presence of 

 transitional examples in his series, collected by Meyer, but 

 we are not sure that he had the real umbrosa. Figured from 

 the type lot, no. 65714, A. N. S. P. 



72. A. SEMINUDA Baldwin. PI. 37, figs. 18, 19, 20. 



The shell is imperf orate (or sometimes rimate), globose- 

 ovate, solid, yellow, covered with a thin cuticle which on the 

 spire, the front and upper half of the last whorl is yellow 

 with sparse chocolate mottling or streaking, and on the lower 

 half of the last whorl is in large part black. The embryonic 

 whorls are denuded of cuticle, and either white, fleshy or 

 purplish (and sometimes the whole spire is of a dull purplish 

 color). Embryonic shell of about 2^/2 whorls, the first half- 

 whorl smooth, next whorl coarsely costate.with a barely exposed 

 basal carina, the following whorl more closely costate. Later 

 whorls are rather rudely wrinkle-striate, with on the last 

 whorl some weak spirals cutting the wrinkles, and more or 

 less malleation. Last whorl globose (or sometimes coin- 

 pressed), often obscurely angular above the aperture. Aper- 

 ture oblique, white, well-rounded below. Outer lip slightly 

 or heavily thickened within; columellar lamella strong, med- 

 ian. Parietal callus very thin. 



