342 LAMINELLA, MAUI. 



Xewcomb's original figure is copied, pi. 52, fig. 9. The 

 shells we have seen (pi. 52, figs. 1, 2) differ from the descrip- 

 tion by having a pale greenish-yellow ground, otherwise they 

 are typical. In embryonic shells the first whorl is flesh-col- 

 ored and convex; second whorl flattened, becoming yellowish, 

 first half unicolored, then distant brown spots appear below 

 the suture. On the third whorl there are oblique, p retractive, 

 distant deep-brown stripes. The embryo consists of 2% very 

 smooth whorls. 



With the beginning of the neanic stage the chocolate or 

 black stripes are close, more or less forked above, or anas- 

 tomosing into a network. On the last whorl they do not run 

 over the base, at least on the front of the whorl. The neanic 

 and last whorls are delicately striatulate, and so smooth that 

 the shell is slippery to handle. The columellar margin sud- 

 denly dilates above, arching over the rather widely-open per- 

 foration. Columellar lamella well developed, very obliquely 

 entering. Above it the columella is calloused and there is 

 often a weak fold. 



Length 13, diam. 6.2 mm. ; 6 whorls. 



Length 12.8, diam. 6.9 mm. 



The embryonic shell described above was washed out of one 

 of the adults figured. A set of three young shells received 

 from Mr. Baldwin (without adults) are rather different. The 

 first whorl becomes much darker in adults than in the em- 

 bryos, as usual in Laminella. 



9a. L. alexandri duoplicata Baldwin. PL 52, figs. 3, 4, 5. 



Shell shaped as in alexandri, last whorl straw-yellow, the 

 spire whitish, apex dull purple or blackish, last 3 to 4 whorls 

 decorated with widely-spaced, protractive. black stripes, 

 which neither branch or anastomose, and often become re- 

 duced in number and size on the last whorl. Columellar la- 

 mella, rather blunt, and nearly always there is a second much 

 smaller fold above it, often rather indistinct and sometimes 

 wanting. Perforation variable in size, often nearly closed. 



Length 13, diam. 6.5 mm. ; 6 whorls. 



Length 13. diam. 6.8 mm. 



