VARIATION AND ZOOGEOGRAPHY OF LIGUUS IN FLORIDA. 453 



yellowish-olive lines (rarely wanting) 



predominant patter 



on the last half of the last whorl is the 

 (PL XXXVIII, figs. 14, 14a), others having two yellow 

 bands also (PI. XXXVIII, fig. 146). The columella varies from straight and 

 heavy to thin, in all the color-forms, as in Marco Island roseatus. 



The castaneozonatus form is variable in the amount of chestnut coloring (PL 

 XXXVIII, figs. 14c, d, e; text figure 12). The pattern begins on or at the end 



Fig. 12. 



fasciatus 



of the fourth whorl in most adult examples, as a series of oblong spots. In well- 

 preserved or young shells it is faintly visible earlier, on the last embryonic whorl. 

 On the penultimate whorl the spots spread to form a continuous or interrupted 



which usually continues on the last whorl but rarely reaches the lip 



A 



similar basal zone is occasionally developed. Probably through impotence of 



the color-factor for chestnut, the 



often very imperfectly developed 



fig. 14c. Their upper and lower borders are apt to persist when the middle 



of the zone is weak or wanting, a narrow-banded pattern being thus produced 



(text figure 12, middle fig.). 



the yellow-banded roseatus ground-colors described above 



The chestnut zones appear on both the white and 



The color-patterns are in the following proportion 



Mr. Moore 



{ white ground, 198 = 48.53 per cent. 



= 8.58 per cent. 



^ \ yellow-banded, 35 



Castaneozonatus pattern . . . 175 



McKinney 



42.9 per cent 



( white ground, 224 = 30 per cent 

 pattern j yellow . banded> 98 = n.7 pe r cent 



pattern 



In the lot collected by Mr. McKinney 



56.6 per cent 



the course of clearing four 



of hammock land there are four shells (PL XXXVII, fig. 10) exactly like the 



darkest 



u 



marmoratus 



n 



found at Key Vaca 



The first four whorls 



white 



