AMASTRA, OAHU. 207 



The shells from other places mentioned show little or no 

 local differences in the series examined. 



Ferussac's original description (given in full below) is 

 very poor, and the species would hardly have been recognized 

 except for his figures. ' ' Testa dextrorsa, ovato-inflata, vertice 

 acuminate, striatila ; epidermide bruneo-fuga.ci ; anf ractibus 5, 

 ultimo fere carinato, suturis non distinctis; apertura semi- 

 lunata; peristomate intus incrassato, fere dilatato; eolumella 

 alba, depressa, costa munita ; rim a umbilical! vix distincta. 

 Elle habite les iles Sandwich" (Ferussac). 



A. fuliginosa Gld. was based upon specimens with a light 

 ground, which sometimes has a faint greenish tint, such as 

 fig. 2. Occurring with the brown and intermediate shells at 

 most, if not all, localities, it has apparently little claim to be 

 considered a distinct species or race. Messrs. Baldwin, Sykes 

 and Thwing also hold this view. 



Embryonic shell. The first half-whorl is smooth with steep 

 sides, the suture at first descending rapidly. Fine, slightly 

 arcuate striae then appear. On the first half of the second 

 whorl the striae are a little coarser, afterward becoming so fine 

 as to be hardly perceptible. The latter part of the last whorl 

 has a few white spots on the reddish-brown ground, and the 

 acute peripheral keel is white. There are 2!/2 whorls in all. 

 The columellar fold is moderately developed, and the umbil- 

 ical crevice very minute (pi. 32, fig. 13 ; length 4.4 mm.) . The 

 color is almost always purple-black, but rarely shells with a 

 pa.le luteous embryo are found, as at Waialae (188 Cooke coll.), 

 the first neanic whorl being sparsely maculate with opaque 

 white. This variegation of the spire is unique in shells of 

 this group of Amastraa, and with the incised spiral lines of 

 the adult stage, it indicates relationship with Metamastra. 

 A. badia in Metamastra has similar embryonic sculpture. 



44. A. POROUS n. sp. PL 38, fig. 3. 



The shell is imperforate, globose-come-, 1lii>i, light brown 

 throughout. The embryonic shell of 2i/o whorls is conic, the 

 first whorl convex, the rest nearly flat; surface smooth but 

 not glossy, under a strong lens showing weak, very fine stria- 



