188 Marine Shells of the Western Coast of Florida 



following turn; succeeding whorls bear increasingly stronger ribs 

 and spirals; 11 whorls, sutures distinct, wavy. A strong, undulating 

 subsutural cord angulates summit of whorls above a wide concave 

 sulcus; the sulcus shows one, two or three unequal spiral threads 

 overlying retractively curved incremental lines. Below sulcus the 

 axial ribs extend to suture below. Ribs and interspaces crossed by 

 three elevated ridges separated by wider interspaces. On body whorl 

 eight strong revolving ridges cross and nodulate the axial ribs; 

 interspaces have fine spiral threads; nine revolving cords below, 

 beginning at columella; aperture pyriform, dark within; outer lip 

 with moderately deep notch in the subsutural sulcus; columella 

 callus; anterior canal slightly oblique; operculum dark, shape of 

 aperture, apical nucleus. 



This subspecies differs from C. tatnpaensis in having definite 

 spiral threads in the subsutural sulcus, one or two more axial ribs, 

 more generally distributed spiral striation and the uniformly dark- 

 colored aperture. 



Dredged in four to seven fathoms, with C. tampaensis. 



Crassispira sanibelensis Bartsch and Rehder PI. 39, fig. 272 



Alt., 25.8; max. diam., 9.9 mm. Seven or eight whorls. 

 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, followed by a 

 turn with rather closely spaced axial riblets and an indication of spiral 

 threads with the possibility of nodules at their junction. Postnuclear 

 whorls moderately rounded, appressed at the summit, 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 addi- 

 tion to the coarser spiral sculpture, microscopic spiral lines are present 

 on the entire surface. Base moderately long with a narrow umbilical 

 chink at the tip, marked by four spiral cords, which slightly decrease in 

 size anteriorly. Columella stout, stubby, with six heavy cords and several 

 slender threads anterior to these. Aperture oval, decidedly channeled an- 

 teriorly with a deep sinus immediately anterior to the cord at the sum- 

 mit. Anterior to the sinus the outer lip is protracted into a clawlike 

 element that bears a series of nodules corresponding to the cords on 

 the outside; inner lip heavy and reflected over the columella. A callus 

 extends over the parietal wall joining the heavy cord at the summit.^*^ 



349 Bartsch and Rehder: Proc. U.S. National Museum, vol. 87, No. 3070. 



