TURRIDAE 187 



Anterior to the shoulder three ill-defined spiral cords are present on all 

 but the last two whorls, on which there are four, the penultimate having 

 four, while on the last turn intercalated cords appear between these. Base 

 rather long, marked by the continuation of the axial ribs, which become 

 slightly enfeebled anteriorly and the same type of sculpture as that 

 characterizing the shell anterior to the angle. Columella stout, about as 

 long as the base, marked by obliquely slanting, closely approximtaed, 

 spiral cords, which vary in size and spacing. Aperture narrowly auricu- 

 late, decidedly channeled anteriorly and posteriorly. The anterior chan- 

 nel is deep and well rounded and is situated immediately below the sum- 

 mit. The lip posterior to the sinus is somewhat thickened. Anterior to the 

 sinus the lip is much thickened but tapers to an edge and is slightly pro- 

 tracted. The inside of the outer lip immediately anterior to the channel 

 bears a decided denticle. The inner lip is appressed to the columella as a 

 small callus and thickened on the parietal wall.s*" 



Genus CRASSISPIRA Swainson, 1840 



Crassispira^*" tanipaensls Bartsch and Rehder PI. 38, fig. 270 



Alt., 22; max. diam., 7.3 mm. Ten whorls. 



Shell elongate-turreted, chestnut-brown; interior of the aperture livid. 

 The first nuclear whorl is well rounded, smooth, succeeded by a fraction 

 of a turn in which faint, closely spaced, retractively curved, axial riblets 

 are present, which in turn merges into the postnuclear sculpture. Postnu- 

 clear whorls rendered somewhat shouldered at the summit by a strong 

 spiral cord, which is followed anteriorly by a broad siphonal channel, an- 

 terior to which the whorls are marked by strong, somewhat sigmoid, 

 axial ribs extending to the insertion of the columella. These ribs are 

 about half as wide as the spaces that separate them; of these, 19 are 

 present on the last turn and 17 on the antipenultimate, the early whorls 

 being eroded in the type. In addition to the axial ribs, the whorls are 

 marked by fine incremental lines, which are decidedly retractively curved 

 in the subsutural channel. The spiral sculpture consists of deeply incised 

 lines, which leave the spaces between them as slightly elevated, flattened 

 ribs; of these, 3 cross the axial ribs posterior to the suture. The base, 

 which is moderately long, is similarly marked, and here the incised lines 

 are broader and separate 4 well-differentiated cords, which render the 

 axial ribs nodulose at their junction. Columella short and stout, marked 

 by 9 spiral cords, which decrease in width from the insertion of the col- 

 umella anteriorly. Aperture elongate pear-shaped; outer lip with a pro- 

 found sinus a little below the summit; anterior to the sinus it is pro- 

 tracted into a clawlike element with a mere indication of stromboid notch- 

 ing anteriorly; the inner lip extends over the columella as a broad callus 

 leaving a narrow umbilical chink at its anterior end. A callus extends 

 over the parietal wall.^^s 



Crassispira tampaensis bartschi L. Perry PI. 39, fig. 271 



Alt., 24; max. diam., 7; spire, 13 mm. Shell elongate, turreted, 



chocolate- or mahogany-brown; nucleus and postnuclear whorl 



smooth; riblets and faint spiral striations begin on first half of 



3*6 Bartsch and Rehder: Proc. U.S. National Museum, vol. 87, No. 3070. 



3*^ Lat., crassus, thick, fat; spira, coil, twist. 



3*8 Bartsch and Rehder: Proc. U.S. National Museum, vol. 87, No. 3070. 



