448 VARIATION AND ZOOGEOGRAPHY OF LIGUUS IN FLORIDA. 



aperture 26 mm.; 7 whorls. This is the northernmost point on the east coast 

 where Liguus was found by Mr. Moore. The race is apparently a pure one, with 

 no admixture of blood from the Miami race. It shows no diminution of vigor, 

 as might be expected at the extreme northern range of the species. On the 

 contrary, the individuals are large, symmetrical and finely developed. They 

 are unlike any other crenatus colony seen. 



Lossman's Key, Monroe Co. , on the western border of the Ten Thousand Islands 

 (PL XXXVII, figs. 8, 8a, 86). This is the only crenatus form yet found 

 on the west coast. It is usually much more solid than eastern crenatus, about 

 9 shells weighing one ounce. There is a callous ledge within the lip and the 

 columella is almost always wide, solid and obliquely truncate at the base. The 

 apex is smaller than in eastern forms of crenatus. It is perfect in 90 per cent of 

 the specimens examined, the others having lost the tip only. 

 two are usually very convex above the periphery. The aperture is from 46 to 51 

 per cent of the total length. The white color of the spire may continue on the 

 last whorl or give place to an increasingly deep yellow, paler at the periphery, 

 and separated from the suture by a narrow white band. There are several 

 greenish lines above the periphery, and a group of yellowish-olive ones on the 

 base. These lines are short, rarely exceeding 1H whorls long. 



Variation is chiefly in the extent and intensity of the yellow, and in the shape 

 of the columella; a few of the thinnest and palest shells having a thin, straight 

 columella (fig. 8) as in typical crenatus. 



Whorls 7 : the 



Length 55, diam. 30, aperture 27 mm. (largest). 

 Length 44, diam. 25, aperture 22^ nun. 



The shells were collected in 1904 and 1906, chiefly from ^Jrrf r ^£ 

 miles below the upper end of the Key, and about half a nule "^ <*J^2 

 of measurements on p. 445). Also found in a hammock, reached by ««JJ 

 a creek near the north end of the key (second column «™*^*%^ % 

 In the central part of the key (a few dead specimens) and at M, M™ 

 place, northwest end of the key about 1« miles ml and. <^™^ 

 taken at the several localities. This race may be called L. ^?eZt coast 

 Liguus crenatus, for some reason at present ™^^°\T ri d colonies 

 apparently never extended north of Lossman's Key. The J ^ d 



further northward, at Chokoloskee and Rabbit ^ «W^^ ^ 

 castaneozonatus only, whereas in the area south and east, cremtus 



the combination 



2. Pure Colonies of Liguus 



West Coast 



Florida 



The colonies of roseatus are plotted on the map, fig. ^P^^ xxXVffl 

 Marco Island, Lee Co., on Mr. Pettit's place, Goodland W^' lossy 



) 



figs. 11, 11a, 116) 



>e Co., on Mr. Pettit's place, uooamuu * — - v loggy 



The shell is moderately solid but not heavy, not y 





