AMASTRA, OAHU. 193 



low wrinkles of growth set in. The embryonic shell seems to 

 comprise almost 3 whorls. It is dark 'brown, or when worn, 

 purplish-brown. The rest of the whorls of the spire have 

 rather coarse wrinkles below the suture, leaving the rest of 

 the whorls and the whole last whorl, nearly smooth. Four or 

 five upper whorls are reddish-brown, the last whorl or two 

 are pale red-brown or whitish under a thin, glossy, yellow or 

 flesh-tinted inner cuticle, which is more or less covered by a 

 brown (blackish-brown or olivaceous-brown) outer layer, al- 

 ways worn off ventrally, and either rather well preserved 

 (figs, 19-21, Mokuleia), or remaining in shreds (fig. 17, Wai- 

 anae) or almost entirely lost (fig. 16, Kukuiale). The interior 

 of the basal and outer lips is typically rose-colored, but some- 

 times it is bluish-white. 



Length 19, diam. 9.1, aperture 8 mm. ; whorls GVs- 



Length 17.5, diam. 9.1, aperture 8.1 mm. ; whorls 6. 



A. rubens differs from A. elliptica and the textilis group 

 by its noticeably more conic and sharply striate embryonic 

 whorls, and the greater number of whorls in the whole shell. 

 The fine striation of the embryonic shell is usually more or 

 less completely worn from adult shells. 



Figs. 19 to 21 are from Mokuleia specimens, measuring : 



Fig. 21. Length 18, diam. 9, aperture 8 mm. 



Fig. 19. Length 17, diam. 9.1, aperture 7.9 mm. 



Fig. 20. Length 15, diam. 9.2, aperture 8 mm. 



A large specimen from Waianae, which we consider the 

 type locality, is figured, pi. 32, fig. 17. Length 21 mm., Qy 2 

 whorls. 



In a series from Kukuiala (pi. 32, fig. 16) the outer layer 

 of cuticle is -almost wholly wanting, leaving the shell whitish 

 or yellowish with more or less pink suffusion, most pronounced 

 on the latter half of the last whorl. The shells are rather 

 robust. This form has been called var. rubinia Hyatt in MS. 



Length 17.3, diam. 9.5 mm. (A. N. S. P. no. 92481). 



Length 19, diam. 10.1 mm (U. S. Nat. Mus. no. 4710). 



A. rubens unites features of Amastrella and Parcmiastra, 

 and it may possibly belong to the latter group, near A. inter- 

 media. It has here been associated with the inflata group 



