l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



them. The spiral sculpture of the postnuclear whorls consists of 

 three exceedingly feeble threads in the sinal region at the summit on the 

 first two turns. On the third turn an additional thread is added and on 

 the remaining turns, two more. The posterior of these threads render 

 the later whorls finely nodulose. Anterior to the sinal groove three 

 spiral threads are present on the first and second of the postnuclear 

 whorls, and five on the remaining whorls except the last, which has six. 

 Here too an additional slender spiral thread is present between the 

 first and second and the second and third of the strong threads. The 

 suture is given a somewhat false aspect by the appressing of the sum- 

 mit of the whorls against the preceding turn. Periphery well rounded. 

 Base moderately long, marked by the slender axial riblets described 

 above, which become evanescent a little anterior to the middle, and 

 21 spiral threads, which are of almost equal strength and spacing, 

 the last three near the tip of the columella, however, being less strong 

 and a little more closely spaced. The entire surface of the shell is 

 covered with fine granules. Aperture moderately large and rather 

 broad, strongly channeled anteriorly and posteriorly. Outer lip re- 

 inforced by a strong varix, from which the edge of the lip projects as 

 a clawlike element that is bent inward. The callus on the inside of the 

 lip marking the varix is finely denticulated. Fine denticles also mark 

 the somewhat sinuous columellar margin of the aperture. 



Type. — U.S.N.M. no. 430290, collected at station 26 in 33 to 40 

 fathoms between latitude i8°3o'2o" N., longitude 66°22'o5" W. and 

 latitude i8°3o'3o" N., longitude 66°23'o5" W. It has 9.5 whorls and 

 measures: Length, 14.3 mm; diameter, 6.5 mm. 



This species is related to Glyphostoma gabbi, from which it differs 

 markedly in its color pattern and detailed sculpture. 



GLYPHOSTOMA (GLYPHOSTOMA) HERMINEA, n. sp. 



Plate 4, figs. 2, 5, 8 



Shell elongate-come, rather broad, yellowish white. Nucleus decol- 

 lated. Early postnuclear whorls somewhat worn, those remaining 

 marked by broad, stout, slightly retractively slanting axial ribs, which 

 are about as wide as the spaces that separate them and which evanesce 

 at the sulcus immediately below the summit and likewise gradually 

 evanesce on the base. Of these ribs, 10 occur upon the first to third and 

 12 on the remaining turns. On the sinus below the summit the axial 

 sculpture consists of numerous rather closely spaced curved riblets, 

 which render this part slightly crenvilated. The spiral sculpture consists 

 of rather strongly developed, somewhat flattened cords, which in 



