452 VARIATION AND ZOOGEOGRAPHY OF LIGUUS IN FLORIDA. 



Moore, April, 1904. The race is similar to that of Totten's Key except that 

 the tendency to xanthism is far more marked. The last 2 whorls are yellow, the 

 last one intensely so. There is a pale border below the pink sutural line and a 

 pale band above and below the wide yellow or pinkish peripheral girdle. The 

 only variation from the above is in one specimen like fig. 18 (of Totten's Key) 

 and another resembling fig. 18a. The size is from 46 to 56 mm. long. 



Old Rhodes Key at the north end (PL XXXVIII, fig. 13). The shells are 

 broadly two-banded with yellow, but the bands are often indistinct, more intense 

 at places of growth-arrest. They become fainter with growth, and in mature 

 shells the stronger yellow of the earlier whorls is partially lost by fading. A few 

 faint greenish lines appear on mature shells. There is no peripheral belt of yellow 

 or pink. As in the neighboring colonies, the first 4 or 5 whorls are pink. This 

 form is perhaps nearest to that of Porgy Key, but is also related to the Adam's 

 Key race. Out of 22 taken, only four have attained full size. These measure: 



Length 45, diam. 22, aperture 20 mm. 

 Length 44, diam. 23, aperture 21 mm. 

 Length 40, diam. 21, aperture 19 mm. 

 Length 40, diam. 23, aperture 20 mm. 



Adam's Key, a tiny key at the lower end of Elliott's, afforded two living 

 specimens of a form almost exactly like that of Turner Key, in the Ten Thousand 

 Islands, West Florida. The only difference is that the East Florida form is not 

 quite so heavy. The white shell has a small pink apex. On the median neanic 

 whorls there is a yellow zone, which is wanting on the last \% whorls. On the 

 latter part of the last whorl, green lines and a reddish peripheral band appear. 

 The young shells of this race will be like those of the Old Rhodes Key race- 

 broadly two-banded with yellow. The two shells are adult and measure : 



Length 54, diam. 27, aperture 263^ mm. 

 Length 47, diam. 25, aperture 23 mm. 



The minute resemblance existing between the Adam's and Turner Key forms is 

 evidently adventitious, and due to the rather primitive coloration of both, while 

 in the neighboring colonies there has been specialization of color. 



4. Hybrid Colonies of roseatus X <l 



the West Coast. 



Chokoloskee Key, Monroe Co. (PL XXXVIII, figs. 14, 14a-*). A chestnut- 



, all 



zoned form (castaneozonatus) is here superposed upon the typical roseatus 

 of the four lots before me being hybrid colonies. With the exception oi tou 

 ^linens to be mentioned below, the shells, 1,157 in number may be diviae^ 

 into roseatus and castaneozonatus. The roseatus form is exactly like those 

 Goodland Point and adjacent localities. The white form with some green 



specimens 



