LAMINELLA, MOLOKAI. 353 



citrina by the very strongly triplicate, orange or reddish eolu- 

 mella ; but these are variable features. Baldwin writes : ' ' The 

 typical forms are found in the small valley of Ohia on Molo- 

 kai. Departing from this locality on either side, modified 

 forms without the biplicate columella are somewhat common. ' ' 



In the cotypical lot, 65712 A. N. S. P., there are two color- 

 patterns. In three specimens the neanic whorls have olive- 

 black dots and a few dotted streaks (pi. 50, figs. 12, 14, 15), 

 the apex salmon colored in two of them. Baldwin's figured 

 type (fig. 14) was one of these. In four shells, streaks pre- 

 dominate, there being few dots or none, apex gray or yellow 

 (pi. 50, fig. 13). In all, the markings begin on the second 

 whorl, and are most numerous on the third and fourth, in 

 some shells continuing on the fifth. There are weak traces of 

 pits or depressions on the second whorl, but the dark streaks 

 are not sunken as in L. venusta. The columella in all is more 

 or less deeply orange tinted, this color often extending weakly 

 upon the parietal callus. The columellar folds are subequal 

 in 4, the lower one much larger in 6 of the shells examined. 

 In one shell there is a small intermediate fold. 



Length 19, diam. 9.8, aperture 7.7 mm. ; whorls 6%. 



Length 17.5, diam. 9.7 mm. 



Length 17, diam. 8.8 mm. 



Length 17, diam. 9.8 mm. ; whorls 6%. 



The figures represent cotypes, fig. 14 being that originally 

 illustrated by Baldwin. 



In an embryo of 3 whorls, length 4 mm., the first whorl is 

 smooth, the second and third longitudinally costate. The 

 columella shows no trace of a lamella, and the axis is almost 

 closed (pi. 56, fig. 3). 



14&. L. CITRINA SEMIVENULATA Borcherding. PI. 50, figs. 6, 

 7, 9, 10, 11. 



Shell sinistral, imperforate, sometimes distinctly perforate, 

 rather solid, smooth (very finely striated longitudinally under 

 the lens), somewhat shining, pale buff, figured with very 

 small black spots, the upper whorls and the last one below 

 the middle elegantly ornamented with black veined lines. 



