AMASTRA, OAHU. 185 



29. A. UNDATA Baldwin. PI. 29, fig. 14. 



The shell is imperf orate, globose-ovate, moderately solid; 

 dark reddish-brown, with broad, irregular, light yellow stripes 

 on the last two whorls, zigzag below the periphery, more or 

 less confluent above it, and preceded by scattered whitish 

 spots and dashes on one or two earlier whorls. Spire 

 straightly conic, the whorls but slightly convex; embryonic 

 shell rather sharply, finely striate; later whorls deeply and 

 finely striate, the strice cut by several incised spiral lines in 

 the peripheral region and above it. Aperture subvertical, 

 flesh-colored within; a white callous rim within the lip. 

 Columellar fold broad and subhorizontal. Length 19, diam. 

 12.1, length of aperture 10.2 mm. ; 6 whorls. 



Oahu: Nuuanu (Baldwin); Moanalua (C. Montague 

 Cooke). 



Amastra undata BALDW., Proc. A. N. S. Phila., 1895, p. 

 230. pi. 11, f. 39. 



This species, here described and figured from the type, no. 

 65722 A. N. S. P., according to Mr. Baldwin "is very rare 

 and local in its distribution. Its principal features are the 

 prominent rib-striae and the beautiful undulating markings of 

 light and dark chestnut-brown." The strong spirals cutting 

 the rib-strias are also very characteristic. It differs from A. 

 reticulata by the sharp striation of the embryonic shell, etc. 

 The Moanalua specimen (Cooke coll.) agrees fully with the 

 type from Nuuanu. A young one, also in the Cooke collec- 

 tion, is very broad, and angular peripherally. The striped 

 coloration commences at the beginning of the third whorl. 

 The embryonic whorls are not well described by the term 

 "sulcated," used by Mr. Baldwin. In the terminology used 

 in this monograph they would be termed sharply and finely 

 striate, but on the last embryonic whorl there is a low, indis- 

 tinct undulation under the fine striation. 



30. A. BADIA Baldwin. PI. 29, figs. 15, 18, 19. 



"Shell dextral, imperforate, rather thin, elongately ovate- 

 conic; surface shining, sculptured with delicate, rather close 

 thread-like rib-striae in the direction of the growth-lines; em- 



