FEW FLOKIDA MOLLUSKS — BARTSCH AND EEHDER 135 



Genus CRASSISPIRA Swainson 



Crassispirella, new subgenus 



Shell large. The first nuclear whorl well rounded, smooth, suc- 

 ceeded by a fraction of a turn in which faint, closely spaced, retrac- 

 tively curved axial riblets are present, which in turn merges into the 

 postnuclear sculpture. Postnuclear whorls well rounded, the anterior 

 third marked by strongly elevated spiral threads ; the posterior two- 

 thirds by strong axial ribs and spiral threads. The latter pass in 

 equal strength over both ribs and intercostal spaces. Base marked by 

 the continuation of the axial ribs, which evanesce on reaching the 

 pillar, and sj^iral threads. The pillar is rather short, stout, with 

 an obsolete fasciole a little posterior to the tip, marked by spiral 

 threads a little wider than those on the base. In addition to this, 

 the entire surface of the whorls is marked by lines of growth and 

 spiral striations. The sinus falls in the concave area between the 

 summit and the posterior termination of the axial ribs and is moder- 

 ately broad, deep, and reflected. Anterior to the sinus the outer lip 

 is protracted into a clawlike element that terminates anteriorly in a 

 notch a little posterior to the tip. Inner lip slightly sigmoid, re- 

 flected over and appressed to the base. Parietal wall covered by a 

 moderately thick callus, which is not developed into a conspicuous 

 hump at the parietal wall. A little distance behind the outer lip 

 there is a weakly developed varix. Operculum unknown. 



Type: Crassispira {Crassispirella) rugitecta (Dall) { = Turris 

 rugitecta Dall). Lower California. 



CRASSISPIRA (CRASSISPIRELLA) SANIBELENSIS, new species 



Plate 17, Figuees il, 12 



Shell elongate-turreted, brown, with the intercostal spaces flesh- 

 colored, the edge of the aperture corresponding to the dark color 

 outside, but the interior is livid. First nuclear whorl smooth, fol- 

 lowed by a turn with rather closely spaced axial riblets and an indi- 

 cation of spiral threads with the possibility of nodules at their junc- 

 tion. Postnuclear whorls moderately rounded, appressed at the sum- 

 mit, marked by broad, low axial ribs, which terminate at the anterior 

 extremity of the broad siphonal channel. These ribs are broader 

 than the spaces that separate them. In addition there are numerous 

 threadlike incremental lines. The spiral sculpture consists of heavy 

 cords of which the first one is on the shoulder anterior to the summit. 

 Two strong cords appear anterior to the sutural sinus on all but the 

 last two of the remaining turns; on these, three cords are present 

 that render the broad axial ribs nodulose, the nodules having their 

 long axis parallel with the spiral sculpture. In addition to the 



