NO. 2 NEW TURRITID MOLLUSKS BARTSCH 23 



outside of the columella is marked by a few strong spiral cords. Aper- 

 ture very strongly channeled posteriorly and anteriorly. The posterior 

 channel falls immediately below the summit and is deeply incised. A 

 strong varix is present about half a turn behind the edge of the outer 

 lip which is protracted to form a clawlike element anterior to the 

 sinus. The inner lip appears as a heavy callus, which is reflected over 

 the columella and extends up on the parietal wall. 



DARBYA LIRA, n. sp. 



Plate 6, figs. 4, 5 ; plate 7, figs. 6, 8 



Shell elongate-conic, pale yellow, with a faint brown band encircling 

 the whorls a little anterior to the sinal sulcus at the summit. Nuclear 

 whorls 1.5, smooth, well rounded. Postnuclear whorls well rounded, 

 marked on the first three turns by a submedian row of distantly spaced 

 cusps. On the succeeding whorls these cusps become elongated into 

 ribs that extend from the sinal sulcus at the summit anteriorly to the 

 suture, becoming weaker toward the suture. Of these ribs, lo occur 

 upon the first whorl, 12 upon the second and third, and 14 upon the 

 remaining whorls except the last, which has 16. The spaces that sepa- 

 rate these ribs are a little less wide than the ribs. In addition to this 

 there are numerous fine lines of growth, which slope retractively in 

 the sulcus at the summit and protractively anteriorly. The sulcus at 

 the summit is without spiral sculpture, whereas in the region anterior 

 to it both ribs and intercostal spaces are crossed by rather strong, low, 

 rounded, spiral cords, of which four occur upon the fifth to seventh, 

 five upon the eighth, seven upon the ninth, and eight upon the last 

 whorl between the summit and suture. These spiral cords are more 

 or less equal. Suture rendered conspicuous by the slightly sloping 

 shoulder of the summit of the whorls. Periphery well rounded. Base 

 short, marked by the feeble continuation of the axial ribs and by seven 

 spiral cords which are of unequal strength. Columella short and 

 stubby with a strong, broad fold opposite the varix on the outer lip 

 which is separated from the parietal wall by a concave groove; 

 marked by seven rather broad spiral cords, which are separated by 

 narrow channels. Aperture short, decidedly channeled anteriorly 

 and posteriorly, the posterior channel being deeply notched and at the 

 summit of the shell. There is a broad varix half a whorl behind the 

 aperture, the outer lip being protracted between the sinus and the 

 basal portion. The inner lip is appressed to the columella as a heavy 

 callus which extends over the parietal wall. 



