10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 73 



from Miami that are almost identical Mnth a specimen from Mount 

 Guajaibon in northwestern Cuba, they being larger than the latter. 

 It is found over nearly the entire rocky ridge of southeast Florida. 

 Ehumeus is a line subspecies usually large and solid, somewhat 

 porcellanous, and nearly always pure white throughout. It is almost 

 perfectly mimicked by a shell I collected in western Cuba. It does 

 not extend north of the Miami River but goes south to Long Pine 

 Key in the Everglades. 



Thirteen subspecies of Liguus inhabit this great Miami hammock — 

 ebwmeviS, Tnosieri, luteus, cingulatus.^ marmoratus^ livingstoni^ or- 

 natus, mdamien.s^,s, elegan.s, roseatus^ testudineus, castaneus, and 

 castaneozoTiatus — a considerably greater variety than is found in any 

 other Floridian locality. Luteus occurs from Dania to Long Pine 

 Key and in the former region as well as at Vaca is rather solid and 

 bright colored, but in the lower Dade is thinner and lighter. It is 

 the first form to be colonized in the incipient hammocks, and at 

 almost every sink that has a live oak and a little scrub it will be 

 found, while castaneozonatus is the second migrant. MarTnoratus is 

 a very variable snail with a wide distribution, and specimens found 

 by me in the Miami hammock are very close to those from Key Vaca 

 of Chokoloskee. A form of this has recently been found at Pinecrest, 

 35 miles west of Miami in the Everglades. I have no doubt but that 

 testudineiis, castmieus, and versicolor are hybrids between this and 

 forms of fasciatus. The subspecies elegans was discovered on a small 

 key in the southern Everglades, which was occupied exclusively by 

 it and roseatus^ and it is close to shells I collected in northwestern 

 Cuba. It occurs occasionally along the rock ridge as far north as 

 Arch Creek, usually in a pure form and always having the peculiar 

 brownish flecks on the upper spire. 



Two peculiar forms of crenatus are confined to the southwest main- 

 land, where they have a limited distribution — lossTiianious and capen- 

 sis. The former is dull colored, whitish, sometimes with narrow 

 spiral greenish lines, and the whorls are usually well rounded. The 

 form capensis is elongated, and solid with flattened whorls occu- 

 pying Northwest Cape exclusively and found rarely elsewhere in 

 the cape region. It is probable that both are recent arrivals from 

 Cuba, and they may have drifted through the Bahia Honda Channel. 

 The fact of their limited distribution is evidence in the direction of 

 their recent arrival. 



It is probable that the land of the Cape Sable region is very recent, 

 one of the latest additions to our territory. The area covered by 

 the three points. Northwest, Middle, and East Capes, and the region 

 for some distance back of them is sandy, but it was built up over 

 an old mangrove swamp. Back of this sandy land there is a brackish 

 swamp, and still farther back a considerable prairie, while at the 



