232 



BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



One hundred additional specimens collected by the author yield the 

 following average measurements : 



U.S.N.M. No. 180676 contains 22 specimens from Mangrove Cay col- 

 lected by Owen Bryant. 



U.S.N.M. No. 270204 contains 292 specimens collected by Vaughan 

 at Rocky Point, 4 miles from the mouth of South Bight, Mangrove Cay. 



U.S.N.M. No. 270142 contains 2,438 specimens collected by Bartsch 

 on rocks in an old burnt-over field three-quarters of a mile below the 

 mouth of Lisbon Creek, a quarter of a mile inland, Mangrove Cay. 



U.S.N.M. No. 270083 contains 20 specimens collected on rocks by 

 Bartsch along King's Road, Lisbon Point, Mangrove Cay. 



U.S.N.M. No. 269852 contains 59 specimens collected by Bartsch 

 three miles up Lisbon Creek a little above Bull Coppice, Linder Cay, 

 Mangrove Cay. 



U.S.N.M. No. 269898 contains 7 specimens collected by Bartsch on 

 the banks of Lisbon Creek three-quarters of a mile below its mouth on 

 grass and shrubbery, Mangrove Cay. 



U.S.N.M. No. 269795 contains 69 specimens collected by Bartsch on 

 the hills behind the Blue Hole, Mangrove Cay. 



U.S.N.M. No. 270013 contains 363 specimens picked from leaf mold 

 by Bartsch from the top of the hill near the Blue Hole, Mangrove Cay. 



U.S.N.M. No. 270183 contains 19 specimens from Pott's Cay, collected 

 by Bartsch, South Bight, Mangrove Cay. 



U.S.N.M. No. 269841 contains 27 specimens collected by Bartsch on 

 pine coppice opposite Sampson's Brigadine Cay, Mangrove Cay. 



U.S.N.M. No. 270156 contains 69 specimens from pines i mile from 

 the mouth of Lisbon Creek, Linder Cay, Mangrove Cay. 



U.S.N.M. No. 269362 contains 37 specimens collected by Bartsch on 

 pines and palmettos. Bull Coppice, Linder Cay, Mangrove Cay. 



U.S.N.M. No. 270080 contains 16 specimens collected under rocks by 

 Bartsch along Kings Road, Lisbon Point, Mangrove Cay, 



U.S.N.M. No. 5 1 5841 contains 9 specimens collected by William 

 Mann on Mangrove Cay. 



U.S.N.M. No. 270242 contains 3 specimens collected by Bartsch under 

 pines and palmettos at Bull Coppice about 3 miles from the mouth of 

 Lisbon Creek, Mangrove Cay. 



This subspecies closely resembles the shells I collected on Gun Cay, 

 Opisthosiphon (Opisthosiphon) vaughani occidentalis, from which its 

 larger size will distinguish it. 



