AMASTRA, MAUI. 305 



smaller columellar lamella. The monotype was found by 

 Hyatt among Gulick's shells labeled assimilis. It is evi- 

 dently a mature shell, much narrower than young assimilis 

 of the same length. Named for Mr. C. W. Johnson, Curator 

 of the Boston Society of Natural History. 



This form, A. erecta and A. subpulla do not agree with the 

 assimilis group in coloration, but they are closely related in 

 other characters and may be aberrant members of that series. 



101. A. ERECTA (Pease). 



Shell dextral, imperforate, rather solid, turrited, irregu- 

 larly delicately striate, slightly shining, covered with a thin 

 epidermis; whorls 7, convex, the last forming % the length; 

 suture impressed; columellar fold laminiform, thick, slightly 

 oblique. Aperture ovate; columella arcuate. Straw-colored, 

 light-reddish or brownish with the apex purple. Length 15, 

 diam. 7.5 mm. (Pse) . 



Maui (coll. Pease and Crosse). 



Laminella erecta PEASE, Journ. de Conchyl., 1869, p. 174. 

 Amastra (L.) erecta Pse., SYKES, Fauna Hawaiiensis, p. 

 349. 



" I know of no other species with which L. erecta may be 

 compared. The shell is very regular in shape, its whorls in- 

 creasing regularly ' (Pse.). " Close to A. micans Pfr." 

 (Sykes). 



This species seems to be unknown to collectors in the Islands, 

 as it is to us. Pease and Sykes place it in Laminella, but 

 from the description it seems to be an Amastra. The presence 

 of enough epidermis to be noticed by Pease is against its 

 reference to Laminella. Dr. C. M. Cooke in a recent letter 

 states that L. erecta is identical with A. micans (p. 210), an 

 opinion which seems to me well founded. 



102. A. ASSIMILIS (Newoomb). PI. 27, fig. 17; pi. 46, figs. 9 

 to 14. 



Shell conically elongate, acute above; whorls 7, rounded; 

 suture well impressed. Aperture small, ovate, columella very 

 short, plicate, twisted; lip acute, thickened slightly within. 

 Color white or salmon, sometimes the lower half of the last 



