LAMINELLA, MAUI. 337 



covered with a pale or rather deep yellow cuticle, the earlier 

 whorls denuded ; first two pale yellow, the next faintly pink 

 in a specimen received from Newcomb (fig. 10). In other 

 shells the embryonic whorls are very pale yellow, and in one 

 lot the first three whorls are dull cadmium yellow. The in- 

 terior and columella are white. Columella triangularly re- 

 flexed, convex and calloused, as usual in Laminella. Coln- 

 mellar lamella rather small, steeply ascending ; above it there 

 is the weak trace of a fold. Axis perforate. Length 9.8, 

 diam. 6, aperture 4.5 mm.; 5% whorls (pi. 54, fig. 10, from 

 Newcomb). 



In a lot of 4 shells collected by Mr. Thaanum, 3 are sinis- 

 tral, 1 dextral. Two have a strong, callous fold above the 

 columellar lamella, and three are imperforate. The spire is 

 longer than in the shells from Newcomb. Length 11.2, diam. 

 6.1, aperture 4.7 mm.; 5% whorls (pi. 54, fig. 11). 



Color-var. circumcincta Dall, n. var. PI. 54, figs. 12, 13. 

 Last whorl having blackish bands; a narrow one below the 

 suture, a wide band above the periphery and a narrow one 

 below it, the middle band sometimes wanting, upper band 

 or bands ascending on the penult, whorl. 



This form occurs in some colonies of the one-colored concin na. 

 and its characters are probably not yet of racial significance. 

 I have retained the collection name in order to call attention 

 to the form, which is important as showing a color-pattern 

 otherwise unknown in Laminella. The bands are very super- 

 ficial, as if painted on. The typical example, no. 31404 U. S. 

 Nat. Mus., from the Dall coll., has three bands. One in coll. 

 C. M. Cooke, no. 2201, lacks the broad median band. Both 

 are figured. 



Sykes notes that " in the very fine series collected by Per- 

 kins, both dextral and sinistral forms occur; black bands are 

 either absent or present, and in the latter event vary from 

 one to even four in number." 



Species of Maui. 



L. picta and bulbosa are the more primitive forms, having 

 relationships with species of Lanai and Oahu as well as with 



