THE NAUTILUS. 63 



From Inner Green Island the collection contained 160 plain ; 16 

 banded 12345; 3 00300; band three is somewhat obsolete, and 

 bands one and two are frequently more or less fused toward the 

 margin ; a few with translucent bands. 



The collection from Swan Island of 43 specimens are all banded 

 12345, and show but little variation. 



The specimens from White Bull Island show perhaps the greatest 

 variation of any New England locality. The following variations 

 were represented in a series of 95 specimens; 6 subglobosa ; 4, 

 00300, band usually obsolete except near the margin ; 2, 00340, 

 band four obsolete except near the margin, and bands one and fire 

 very slightly indicated near the margin ; 68, 12345 ; 10, (12)345 ; 

 1, (123)45 ; 3, (12345). The species has not before been recorded 

 from the last two mentioned islands. 



On Eastern Mark Island only Pyramidula alternata Say, and 

 Polyyyra albolabris Say, were found, with one sinistral specimen of 

 the latter. On Jaquish and Turnip Islands only Pyramidula 

 alternata was found. 



LAND SHELLS COLLECTED ON THE BIMINI ISLANDS, GUN AND 



CAT CAYS, BAHAMAS. 



BY GEORGE H. CLAPP. 



In May 1912 the writer with J. B. Henderson and Charles T. 

 Simpson visited the Biminis and adjacent keys in the yacht Eolis. 

 The object of the expedition was primarily for the collection of 

 marine mollusks along the edge of the Gulf Stream which almost 

 touches the shore of these islands ; considerable effort was made 

 however, to secure a full list of the land shells and the following 

 represents the results of some hard work under a very hot sun. The 

 identification of these shells was made under the difficulties always 

 presented by a fauna that consists of a mixture of several elements 

 and where the various races of species through isolation have taken 

 on characteristics differing slightly from the typical. The astonish- 

 ing abundance of Cepolis varians is worthy of comment. For the 

 most part, however, land shells are not abundant on these islands, 

 even the Cerions, that standby of collectors in the Bahamas, are 

 only to be gathered in a few restricted localities. 



