dall: mollusca and bkachiopoda. 261 



sinus obsolescent at the suture; canal rather wide, long; operculum wanting. 

 Nucleus eroded. Type S. blanda Dall. 



The characteristic sculpture and form of these little shells is very notable. They 

 resemble in miniature Irenosyrinx without the operculum or carinae. If one may 

 be permitted to judge from a figure only, the Homotoma producta Bellardi, should 

 belong to it. 



Clinura Bellardi, 1875. Shell solid, snort, biconic, the whorls strongly carinate 

 at the periphery and flattened toward the suture; anal sulcus wide and deep, close 

 to the suture ; canal sliort and recurved ; axial sculpture inconspicuous, opercu- 

 lum absent. Type Pleurotoma calliope Brocchi. 



This section is convenient for holding a few species with very marked form 

 which, if rounded instead of carinate and with a less constricted suture, might 

 easily find a place with Gymuobela. 



Bellardiella Fischer, 1883 {Bdlardia B. D. and D., 1882). Shell small, 

 fusiform, with axial and subequal spiral sculpture ; nucleus having the exposed 

 part with a trochoid aspect, and carrying the Sinvsic/era sculpture ; subsequent 

 whorls rounded, with very distinct suture ; anal sulcus at the suture, rather deep, 

 leaving an inconspicuous fasciole ; outer lip thin, simple, sliarp, much produced in 

 arcuate form; pillar simple, obliquely truncate in front, twisted, impervious ; ani- 

 mal inoperculate. Type il/«/*ea:yA-flcj7/5 Montagu. 



It is particularly called to the reader's attention that the above groups are 

 accepted tentatively for the purpose of this paper and that, in so accepting them, 

 subject to future revision, no attempt at a new classificatiou or arrangement of 

 this family is intended. 



Turris (Surcula) fusinella Dall, n. ep. 



Plate 14, figure 7. 



Shell small, slender, delicate, white witli a faint suffusion toward the periphery of 

 pale pinkish, with ten or more whorls ; spire acute, a little shorter than the aperture ; 

 nucleus of three elevated whorls milk-white, glassy, smooth, abruptly changing to 

 the adidt type of sculpture ; fifth whorl with seven, ninth with ten, short axial 

 ribs, chiefly visible on the periphery, crossed by two strong spiral cords, more or 

 less turgid at the intersections; the whorl above these cords is somewhat exca- 

 vated with a nearly smooth surface except for lines of growth and three or four 

 spiral threads, more distinct and numerous on the later whorls ; base bordered by 

 a prominent cord on wiiich the suture is laid, giving the etTect of a prcsuturnl ridge 

 just behind the anal fasciole ; on the base are about 20 more cords with a tendency 

 to alternate in size ; the wliolo surface has minute spiral striae and lines of growth 

 which form a microscopic reticulation only visible with a good lens ; aperture 

 rounded, canal long, slender ; body polished and the sculpture eroded ; pillar 

 white, callous, obliquely truncate in front, slightly twisted, not pervious ; outer 



