VARIATION AND ZOOGEOGRAPHY OF LIGUUS IN FLORIDA. 4f>7 



either case being decorated with grass-green, olivaceous or yellowish 



« 



The coluii 



ari< from th< 



The yellow is rarely disposed in two wide zones. 



typical thin, continuous crenatm structure to a thicker, truncate form as noted 



under 



The sutural line is white 



: Next in point of numbers is the roseatus type. The specimens an thin 

 and i xcept for the presence of pink vary in color e: ictly like the rmtoas* form 

 The columella is usually truncate, but not very thick. There arc no pink line) 



whorls are white Tin 



at suture or periphery 



d occasionally the apical 



component of this hybrid race is therefore decidedly unlike 



it 



W 



Florida roseatus, its characters being decidedly modified apparently by the 

 mixture with crcnatus. Occasionally pink is visible only as a faint w» h on the 



parietal wall. 



3. PI. XXXIX, figr 20.7, h, i, j. 



The aistaneozorwtus form is 1 n 



•1m 





where superposed upon the roseatus type only, never upon the crtnctn* type 

 doubtless because in hybrids with crcnatus rose color is dominant over whit 

 The dark band is composed of numerous oblong spots, which on the penultimate 

 or next earlier whorl tend to coalesce by groups of two, thn* or more, forming 



an interrupted band 



This only rarely extends upon the last whorl in adult 



shells, and never to the lip. A lower or basal band is usualh present in voting, 

 rarely in adult shells. Otherwise the patterns are as in romtus described in the 

 last paragraph. The parietal callus varies from pale rose to dull purph This 

 pattern of coloring intergradeswith roseatus through specimens, such as fig. 20j 

 which show only a few faint traces of chestnut. By its usual prese i only in 

 the period of youthful rapid growth, it appears that in the Miami colony chestnut 

 banding is decadent. Its factor in heredity is becoming impotent. 



In Miami crcnatus, roseatus and rastaneozonatus it is possible lo assort moat 

 specimens into (1) smaller, heavy forms, with truncate collumclla, and «2) larger 

 thinner ones with the columella nearly or quite continuous 



In a lot taken at 



random from the hammock on the south side of the river, opposite Miami 

 proportions of these several forms are as follows. 



Color-type, etc. 



crenatus 



roseatus 



cattaneozonatu$ 



Average weight 



.08 oz. 



per cent 

 per cent 



per cent 



Total per" • «** 



color VJ* 



per cent 



per < <ni 

 per rent. 



11 oz. 



In all hybrid and some pure colonies of Floridan Liguus, the character of tl,< 



columella varies independently of the 



The heavier, truncat type pre 



vails in the young stages, and is also phylogenetically older, L. faxialus of Cuba 

 and other related species having this type of columella 



4. Plate XXXVIII, figs. 20, a-f 



The fourth element in the Miami Liguui 



series is the so-called tortoise-shell snail, form testudineus, which may p< haps 



