74 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Pyramidella (Syrnola ?) winkleyi new species. 
PI. 11, fig. 1. 
Shell broadly and regularly elongate-conic, semitranslucent, light 
yellowish brown (nuclear whorls decollated). Post-nuclear whorls 
moderately rounded with appressed summits marked only by lines of 
growth and exceedingly fine microscopic spiral striations. Periphery 
and base of last whorl rather inflated, the latter rather short, both well 
rounded and marked like the spaces between the sutures. Aperture 
ear-shaped, posterior angle acute, outer lip very thin; columella 
slender, twisted and somewhat revolute, provided with an oblique fold 
a little below its insertion. 
The unique type, cat. no. 203,745 U. S. N. M., was collected by 
Rev. H. W. Winkley from the Branford River, Conn. It has eight 
whorls and measures: length, 5.8 mm.; diameter, 2.0 mm. 
TURBONILLA Risso. 
Turbonilla Risso, Hist. nat. Europe Merid., vol. 4, p. 224, 1826,= Elusa 
A. Adams, Ann. mag. nat. hist., ser. 3, vol. 7, p. 297, 1861. 
Shell cylindro-conic, many whorled, generally slender, columellar 
fold single, varying in strength^ outer lip entire; shell usually smaller 
than in Pyramidella and larger than in Odostomia. 
Type, Turbonilla tijpica Dall and Bartsch = T. plicatula Risso (not 
Turbo plicatula Scacchi). 
Key to the Subgenera of Turbonilla. 
A. Spiral sculpture absent, or, if present, consisting of exceedingly fine 
microscopic lines only. 
a. Axial ribs obsolete on the later whorls .... Ptycheulimella. 
aa. .Axial ribs not obsolete on the later whorls. 
b. .Axial ribs terminating at the periphery of the last whorl 
Chemnitzia. 
bb. Axial ribs continuing over the base of the last whorl 
Turbonilla. 
AA. Spiral sculpture present, always stronger than mere microscopic lines. 
c. Spiral sculpture consisting of fine incised lines . . Strioturbonilla. 
cc. Spiral sculpture consisting of strongly incised grooves . Pyrgiscus. 
