450 VARIATION AND ZOOGEOGRAPHY OF LIGUUS IN FLORIDA 



continuous in the majority of adults. The size varies from length 56 H' 

 27 mm. to length 65, diam. 30 mm. ' am * 



The total absence of yellow, even in the young, gives this colony a very 

 distinct appearance. It is an incipient race. 109 living and some dead sh / 

 were taken by Mr. Moore in 1904 and 1906. 



Turner Place or Key, Turner River, Lee Co. The typical L. /. roseatus 

 was found in 1904 and 1906 not distinguishable from those of Goodland Point 

 The young, 30 to 34 mm. long, have two rather bright yellow bands, which finally 

 disappear, leaving the last whorl white with green and reddish lines. At the 

 same time, the yellow band on the spire fades more or less in the living snail 

 so that it is not conspicuous in the adult stage. 6 living specimens. This 

 place is near Chokoloskee. 



East Cape, Cape Sable (PL XXXVIII, fig. 15). The pure roseatus occurs 

 here with two broad yellow zones, which fade with advancing age, but usually con- 

 tinue to the lip. Greenish lines are wholly wanting or but faintly visible behind the 

 lip ; the sutural pink border of typical roseatus is reduced to a narrow yellowish 

 line or wholly wanting, and there is no pink or yellow peripheral line. The size of 

 adult individuals varies widely. The shell is solid, usually with thick, truncate 

 columella but sometimes it is less thickened, with the columella narrower and 

 continuous. The coloration varies in intensity, some shells being as pale or 

 paler than fig. 13, others brighter yellow than fig. 15, but otherwise it is constant 

 in 54 shells taken by Mr. Moore. 



Length 44, diam. 23 J^ mm. (average specimen). 

 ' Length 52, diam. 27 Yi mm. (widest specimen). 

 Length 56, diam. 28 mm. (largest specimen). 

 Length 39 J^, diam. 21 mm. (smallest adult specimen). 



The occurrence of a pure race at this place is anomalous in view of the hybrid 

 races found both eastward and at middle Cape Sable. It is quite possible how- 

 ever that the colony has been isolated a long time by pine land or swamps, 

 preventing the access of castaneozonatus ; or it may possibly have started from 

 pure (recessive) individuals of roseatus from a mixed colony. A knowledge o 

 the local topography at East Cape and inland might give a clue to the problem. 



3. Pure Roseatus Colonies from the Keys North of Lakgo. 



In this area the roseatus forms resemble those of West Florida, but are i usuafly 

 smaller, more inclined to xanthism and often more extensively pink, 

 series was collected by Mr. C. B. Moore. The localities are plotted in ng. , 



page 441, and fig. 5, page 442. . . Tntten's, 



The group of keys north of Largo, including Big and Little Palo Alto, iow^ 

 Porgy and Old Rhodes, are inhabited by a race of L. f. roseatus in wnic 

 pink color is exceptionally bright. The size is usually rather small, ana 



