432 VARIATION AND ZOOGEOGRAPHY OF LIGUUS IN FLORIDA 



III. PURE AND HYBRID COLONIES OF LIGUUS. 



In a general view of large quantities of Liguus from several localities it 



readily seen that the colonies are of two kinds. Some will be homogeneous made 





up of individuals conforming to a single type of color and pattern. Other 

 colonies are heterogeneous, composed of shells readily assortable into two or 

 more groups diverse in color or pattern. 



The leading races may be briefly defined as follows : 



I. Shell without green or olive spiral lines; solid, porcellanous (PI. XXXVII, figs. l-2a) . .L. solidus. 

 II. Shell having green or olive lines or their traces (sometimes very faint in melanistic or albinistic 



forms) . 

 a. Apex and inner lip more or less rose-tinted. 



6. Shell thin, decorated with numerous brown and purplish spots, streaks and 



flames (PI. XXXVII, figs. 4-4d) L. fasciatus lignumvitoi. 



66. Black or chestnut bands or spots forming two zones, one basal, often wanting, 



the other above, ascending the spire (PI. XXXIX, figs. 20g-j, 22a-d, etc.). 



L. fasciatus castaneozonatus. 



666. No black, chestnut, or purplish markings (PI. XXXVIII,figs. 11-13, 18-19a). 



L. fasciatus roseatus. 

 aa. Apex and inner lip white ; shell white or yellow, with green or olive lines, no rose or brown 



coloring (PI. XXXVII, figs. 5-86) L. crenatus. 



The relationships and probable phylogeny of the forms may be expressed 

 diagrammatically , thus : 



6 



m 



3 



c3 n 3 



O 



u 2H O 



castaneozonatus 



crenatus 



Variation and Mutatim in Pure Races.- The pure colonies are so by virtue 

 of their isolation. There can be no reasonable doubt that all of the Monaan 

 races will hybridize if brought together. Different colonies of the P"™ ™* s 

 often show divergence in size, average shape, solidity, amount of color deveiope , 

 etc., as described under the several colonies. This seems to be incipient rac a 

 differentiation. In some cases it may be a function of the l*™*" 

 conditions. The reactions of varying conditions upon the individual i aav ^ 



yet been adequately studied, but from the apparent similarity ot cona 

 +h» «,i™,«» T W» ™it.«1. it mav be doubted whether the racial lornw 



museum specimen without 



unknown 



manner of shell collectors. 



Luite likely that it was a commercial shell iocmhwu ■ "' * onatws 



I have not myself found anything resembling ™* W T "^ We ho w* 

 h ™iwtinn« ma dP there bv Mr. J. B. Henderson. « w P» 



in 



i, nor are there any in the collections maae mere oy mi. *. ^. **~~ . ^rida will 

 castaneozonatus mav be found there, in which case a third importation into r 



st rated. 



