328 LAMINELLA, OAHU. 



shreds, or may be almost wholly wanting. The spire has 

 straight outlines and nearly flat whorls. The apex is conic; 

 first half- whorl smooth; then longitudinal folds or ribs ap- 

 pear. On the second whorl these ribs shorten, usually not 

 reaching below the middle of the exposed surface of the 

 whorl; they become finer, and on the third whorl become 

 merely growth-striae. The whole embryonic stage com- 

 prises about three whorls (pi. 56, fig. 1). Subsequent whorls 

 have fine growth-stria3 only. On the early neanic whorls the 

 thin, olivaceous cuticle is streaked, and mottled with trian- 

 ular light spots, or it is pale with ragged zigzag or angulated 

 dark lines (lower w T horl in pi. 56, fig. 1). This pattern usu- 

 ally extends to the penultimate or last whorl, which has a 

 denser, blackish cuticle, retained in fragments, very rarely 

 almost continuous, or sometimes wanting. The aperture is 

 very oblique, and typically almost white. Lip thin, usually 

 dark at the edge. Columellar lamella thin and ascending 

 steeply. 



Length 25.5, diam. 14.3, aperture 12 mm.; 7 whorls (Pa- 

 lolo) . 



Length 28.3, diam. 15, aperture 14 mm.; 7 whorls (Nuu- 

 anu). 



Length 23, diam. 15, aperture 13 mm.; 6y 2 whorls (Nuu- 

 anu). 



Length 20, diam. 12 mm.; 6y 2 whorls (Nuuanu). 



Length 19, diam. 11 mm.; 6% whorls (Tantalus). 



The contour varies a good deal in the same colonies. Fer- 

 ussac's gracilis and C. B. Adams' lata pertaining merely to 

 rather slender and wide individuals respectively, and have 

 no racial standing. A. dimondi of Adams is identical with 

 typical L. gravida. 



la. Form suffusa Rve., pi. 55, figs. 5-8. In some colonies 

 the shells have a pale flesh or pinkish tint, early whorls yel- 

 lowish, the interior pale pink or fleshy; dark cuticle usually 

 almost all lost. Palolo, Tantalus, Nuuanu (figs. 5-7), Kalihi, 

 Moanalua. 



Fig. 8 is a copy of Reeve's figure. Figs. 5 and 6 are tran- 

 sitional to gravida. 



