AM ASTRA. 27 



shells show numerous tawny spiral lines and bands. Near the 

 summit the outlines of the spire are a trifle concave. Em- 

 bryonic whorls a little more convex than those following. 

 The aperture is subvertical; outer lip obtuse, thickened. 

 Columella vertical, forming an angle with the basal lip. 

 Columellar lamella strong, subhorizontal. 



Length 12.3, diam. 6.7, aperture 5.3 mm. G 1 /^ whorls. 



Length 12, diam. 6.4, aperture 5.3 mm. 



Oahu : Outside of Punchbowl, Honolulu, about 300 ft. be- 

 low the summit, about 2 ft. below the surface of the soil 

 (Professor Win. Alanson Bryan, Mar. 15, 1913), type 108958 

 A. N. S. P. 



This subspecies is well distinguished from A. transversalis 

 by the sculpture. The latter species invariably has the axial 

 striae more strongly developed and cut into granules. The 

 color pattern also will probably prove quite different, but it 

 is visible on only one of the series taken by Professor Bryan. 

 Some other specimens however, show a tendency to erode in 

 spiral bands, doubtless indicating former color markings. 



On Diamond Head we took specimens shaped exactly like 

 the types out of a breccia of hard mud and angular fragments 

 of lava, which forms the left wall of the path up to the look- 

 out, inside the crater. None of them show color-markings. 

 Larger shells, length 13.7, diam. 7.3, aperture 6 mm., with 

 61/3 whorls, were taken. 



A. vetusta Baldwin, described from Punchbowl (Vol. XXI, 

 p. 178), is a more strongly sculptured shell of different out- 

 line. It is very closely related to A. albolabris, from which 

 it differs chiefly by the smaller size and more conic shape. 

 By a slip of the pen A. vetusta was referred to as 

 "A. venusta" in Vol. XXI, p. 163, and on p. 174, tenth line 

 from bottom. 



A. caputadamantis is probably to be regarded as a sub- 

 species of A. transversalis. It is larger and more cylindric, 

 but has sculpture of the same character. 



The group of Amastra transversalis requires much further 

 work in the field. They are to be looked for in the superficial 

 deposits of the Pleistocene craters which stand in line along 

 the foothills of Kona. 



