﻿44-8 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 47 



pond may well be due to the presence in the pond of fish and wild 

 fowl, which feed eagerly on such fresh water snails, but could not 

 live in pools periodically dry. The majority of the numerous 

 Planorbis obtained by Mr. Bryant was composed of the P. red- 

 Heidi, the Segmentiua is comparatively rare. Years ago I received 

 from Dr. Brown a single specimen of the latter, from the drift on 

 the shores of the lagoon at Watling Island. 



Planorbis rcdHcldi C. B. Adams. 



Mangrove Cay, Andros, common. 



This species was originally described, from Jamaica, and is an 

 addition to the fauna of the Bahamas ; the manner of its occurrence 

 has been described under the last species. 



Physa acuta Draparnaud. 



Mangrove Cay, Andros ; not abundant. Watling Island (J. J. 

 Brown). 



This species was identified by D'Orbigny in 1842, from Cuba, 

 Jamaica, Guadeloupe and Martinique, as well as South Europe and 

 the Canary Islands. Later it was found in large numbers in one of 

 the hothouses at Kew Gardens by Jeffreys, introduced with aquatic 

 plants from the West Indies. Dr. Brown Goode collected specimens 

 from water tanks at Bermuda, which were identified by Dr. Pilsbry. 

 I received a single specimen from Watling Island. Now Mr. Bryant 

 adds it to the fauna of the Bahamas. I formerly supposed this 

 species to be an introduction from Europe, but am now quite con- 

 fident that it is indigenous to the Antillean region. I have carefully 

 compared European and Antillean specimens and find the differences 

 slight and inconstant, though one would not expect a fresh water 

 shell to have such a geographical distribution. An anatomical ex- 

 amination will be required to remove all lingering doubts as to 

 their identity. Mr. Bryant's specimens are all immature. 



Tralia pusilla Gmelin. 



Sweetings village, Abaco. Also Florida, Bermuda, etc. 



Melampus (Detracia) bulloides Montagu. 



Andros Island at Mangrove Cay. 



A single young specimen was obtained. The species had pre- 

 viously been reported from Nassau. Also at Riding Point, Grand 

 Bahama. 



Pedipcs mirabilis Muhlfeldt, var. tridens Pfr. 



\ixlros, at Daulin Bay, Sweeting's village, Abaco. 

 This species is quite variable in the coarseness of its spiral sculp- 

 ture. Young specimens with line sculpture and in which the median 



