VARIATION AND ZOOGEOGRAPHY OF LIGUUS IN FLORIDA. 447 



Length 42, diam. 21, aperture 20 mm. 

 Length 44.5, diam. 22, aperture 21 mm. 



Larger specimens were found on the ground, long dead. One measures, length 7 1 

 length aperture 31 mm., whorls 8J^. It shows no trace of color-pattern and 

 apparently was like the living form except in size. 



This race differs from elliottensis by the larger size, greater solidity and 

 glossy, porcelain-like surface. Very few specimens were taken by Mr. Moore 

 and further collection on the Key is desirable. It may possibly be mere »■ a 

 crenatus segregate from a hybrid race. The proximity of Angelfish Key to 1 4irgo 

 renders this probable. 



Elliott's Key (PL XXXVII, figs. 3, 3a, 36). Near the south end of the Key 

 a small, fragile race was found by Mr. Moore in 1904. The shells are light, 

 white with translucent-gray streaks, sometimes faintly tinted with creamy-olive 

 on the last part of the last whorl. There is a very faint yellow sutured line and 

 usually some light yellowish-olive-green lines, chiefly basal, and gometim. 

 wanting. The half-grown young occasionally show two very faint wide yellow 

 zones, one above, the other below the periphery. Li older shells the upper 

 of these bands shows on the penultimate whorl. 18.5 per cent of the speriiuc 

 are so marked. The spire is straightly conic, whorls but slightly convex Colum- 

 ella thin and simple. Apex and columella invariably white. The aperture is 

 about half (47 to 53 per cent) the length of the shell. 



Length 39.5, diam. 21, aperture 19 mm. 

 Length 37, diam. 21, aperture 19 mm. 

 Length 35.5, diam. 20, aperture 17.5 mm. 



This small race, of which I have seen 65 specimens, is very uniform in char- 

 acters. The shells are fragile, and frequently broken by falling. More than 10 

 per cent of the adults seen have had holes broken in the shells, usually in the spire, 

 sometimes very large and requiring extensive repairs. The first two whorls are 

 vacated and partitioned off, but generally are not deciduous. This race may be 

 called Liguus crenatus elliottensis. 



New River, below Fort Lauderdale, 25 miles north of Miami (PI. XXXVII, 

 figs. 6, 6a). Collected by Mr. Moore in 1904. The shell is wide and conic, the 

 last whorl subangular in front; the aperture is half the length, the diameter 

 decidedly more than half. The smooth, glossy surface is often faintly malleated 

 obliquely. It is pure white without a trace of yellow, and has a few distinct lines, 

 varying from bright green to brownish-olive. The lines above and below the 

 periphery are usually widest, and there are often no others on the upper surface. 

 The number of lines varies from one to seven in the specimen n. Whorls 7. 

 Columella a little thicker than in most forms of crenatus, but not in the least 

 truncate. The parietal wall shows translucent-grayish vortex-streaks. This 

 local race may be called L. crenatus septentrionalis . Length 51, diam. 28, 



