334 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
Bittium nigrum Totten. 
Tampa, abundant on “coon oysters;” Cedar Keys, abundant on the 
mud flats. The specimens exactly resemble New England specimens 
of this widely distributed species. 
Bittium greenii C. B. Adams. r 
Cedar Keys, on “coon oysters,” rather rare. 
Cerithidea scalariformis Say. 
Cedar Keys, near high-water mark. 
Melvill reports * C@. crassilabrum Ad.” from Cedar Keys, which is 
probably this species, and a “ C. costata Wood,” which may be one of the 
others; neither name appears to be known to other authors in connec- 
tion with the fauna of the southern coast or the West Indies. 
Cerithidea turrita Stearns. 
Key West, in the salt ponds, rather rare; all the specimens are some- 
what distorted, perhaps from excess of salt. 
Cerithidea tenuis Pit. 
Mouth of the Manatee River, abundant, but mostly immature. A 
good series should be compared with the preceding species. 
Vermetus lumbricalis L., var. nigricans. 
Sarasota Bay, in masses near high water. All the figures of lumbri- 
calis seem to represent something quite different from the small, black, 
gregarious Vermetus of our Florida coast, which almost makes reefs with 
its solidly aggregated masses whose interstices rapidly fill with other 
solid matter. For this extremely familiar form the varietal term of 
nigricans is therefore proposed until a careful study of the group shalk 
determine what the typical lumbricalis really is. 
Rissoina Qubiosa C. B. Adams. 
Key West, plenty on the reefs at low water. 
Rissoina pulchra C. B. Adams. 
Key West, rare in the same localities as R. dubtiosa. 
Rissoina chesneli Mich. 
Cedar Keys, plenty on the mud flats. The above are all common to 
the West Indies. 
Bythinella obtusa Lea. 
Key West, in the salt ponds, rare; also in the creek at Jacksonville. 
Lea’s species was erroneously attributed to Ohio, and hence has net 
since been recognized, but the specimens agree well with his figure and 
description, and it is probable that his correspondent’s labels got mixed. 
Melaraphe scabra L., vars. 
_Key West, on the mangrove bushes; sometimes ten feet above high 
water. There are numberless varieties, many of which are very beau- 
