240 BULLETIN 192, UNITED STATES NATIONAL MUSEUM 



U.S.N.M. No. 270032 contains 5 topotypes from the same source. 



U.S.N.M. No. 269883 contains 42 specimens collected by Bartsch 

 near Smith's place, Andros Island. 



U.S.N.M. No. 269569 contains 69 specimens collected by Bartsch on 

 the south side of South Bight on the hill top near Smith's place, mostly 

 under stones. 



U.S.N.M. No. 270165 contains 66 specimens collected by Bartsch in 

 the earth about the edge of large stones on the hill top near Smith's 

 place on the south side of South Bight, Andros Island. 



U.S.N.M. No. 269393 contains 2 specimens collected by Bartsch from 

 Long Bay District, Andros Island. 



I take pleasure in naming this species for G. H. Drew, the eminent 

 British bacteriologist who was a member of the staff of the Carnegie 

 Institution expedition to Andros Island in 1912. 



Leptopisthosiphon, new subgenus 



Opisthosiphons without spiral sculpture on spire, base, or umbilical 



wall. 



Type species : Opisthosiphon (Leptopisthosiphon) coloni, new species. 



KEY TO THE SPECIES OF LEPTOPISTHOSIPHON 



Axial sculpture consisting of strong ribs and fine threads barbouri 



Axial sculpture consisting of strong ribs only colom 



OPISTHOSIPHON (LEPTOPISTHOSIPHON) BARBOURI Clench 



Plate 35, Figure 9 



1933. Opisthosiphon hahamense barbouri Clench, Proc. New England Zool. Club, 

 vol. 13, p. 84, pi. 1, fig. 14. 



Decollated shell elongate-ovate, pale brown, with darker, slender, 

 interrupted spiral bands of brown; peristome soiled white, interior of 

 aperture pale brown. The postnuclear whorls are well rounded and 

 marked by moderately retractively slanting axial ribs between which one 

 or more fine axial threads are present. Some of the strong axial ribs 

 become expanded at the summit where they form conspicuous hollow 

 cusps. These are of paler color than the rest of the shell and thus form 

 a very conspicuous pattern. Suture strongly constricted and rendered 

 irregular by cusps at the summit of the whorls. Periphery well rounded. 

 Base moderately long, well rounded, narrowly openly umbilicated, and 

 marked by the continuation of the axial ribs. Aperture obliquely oval; 

 peristome double, the inner slightly exserted and reflected and appressed 

 to the outer ; the outer moderately expanded and reflected, thick, broadest 

 on the parietal wall, and partly reflected over the umbilicus. The siphon 

 is thick, its free edge almost touching the channel in the suture behind 

 the lip. Operculum opisthosiphonid. 



The specimen described and figured (U.S.N.M. No. 536871) is a para- 

 type received from the Museum of Comparative Zoology. It has 4.2 



