44 AMASTRA. 



with a dark spire, rarely dark with a light base. Bather 

 rarely there is a thin fragmentary outer cuticle, ivory-yellow 

 with zigzag or netted markings of mummy brown. The em- 

 bryonic whorls (fig. 10) are more convex and more finely cos- 

 tulate than in A. affinis. The embryonic shell is either chest- 

 nut brown, pinkish buff or cream, and usually has oblique 

 corneous markings on the last half whorl. The aperture re- 

 sembles that of A. affinis ; outer lip scarcely thickened within ; 

 columellar fold strong. 



Length 10.2, diam. 5.7, aperture 5 mm. ; 5% whorls. 



Length 11, diam. 6, aperture 5.2 mm. 



West Maui: Olowalu Gulch, district of Lahaina, D. 

 Thaanum. Cotypes in A. N. S. P. and Bishop Mus. 



A very pretty species, closely related to the East Mauian 

 A. affinis, and like that variable in color. The embryonic 

 whorls are more convex, more finely costulate, and show the 

 keel less ; the shell is smaller than the average affinis, and the 

 columellar lamella is a little larger. 



A. LINEOLATA (Newcomb). PL 7, figs. 18, 19. 



Vol. XXI, p. 320. Newcomb ? s collection contains three 

 specimens on the lineolata cord, one having been broken off, 

 probably to send to London for illustration in his paper of 

 1853. The three specimens represent two species. One 

 shell has the "umber colored zigzag lines," and must there- 

 fore be the type. The other two have no dark markings. 

 They agree with Newcomb 's figure in P. Z. S., copied in 

 volume XXI, pi. 45, fig. 9. 



The specimen which we take to be the type (pi. 7, figs, 

 18, 19), is openly perforate, rather thin. The spire is con- 

 vexly conic below, but a little concave towards the summit. 

 First half whorl smooth, next whorl flat, coarsely costate, 

 carinate at the lower edge. The ribs are finer on the suc- 

 ceeding whorl, towards the end of which they disappear ex- 

 cept below the suture. Following whorls have faint growth- 

 lines. The shell is pinkish under a thin tawny-olive cuticle, 

 which is marked with a darker shade (Saccardo's umber) as 

 shown in the figure. The embryonic whorls are brownish. 



