48 BULLETIN OF THE 



Seguenzia ionica Watson. 



Watson, loc. cit., p. 589. 

 Station 33, 1,568 fms. Station 41, 860 fms. 



Seguenzia delicatula n. s. 



Shell somewhat resembling S. carinata Jeffreys, but with the sides of the 

 cone rather concave than convex, an acute apex, and quite dift'erently sculp- 

 tured. Whorls seven, the nucleus prominent, rounded, transparent ; the next 

 two whorls irregularly reticulately sculptured with the transverse sculpture 

 following the lines of growth ; the remainder having fine revolving liroe en- 

 tirely covering the whorl above and below ; a raised band just above the 

 suture or basal margin, across which pass squarish bands half the width of 

 their interspaces, composed each of several threads following the lines of 

 growth, lost on the middle upper surface of the whorls and reappearing as 

 flexuous plications below the sutures. Base plano-convex, crossed by lines of 

 growth which appear as slight plications near the umbilicus and as nodules 

 (18-20) on the strong umbilical rib. Otherwise much as in S. carinata. Alt. 

 5.0. Basal diam. 6.0. Umbilical diam. 1.0 mm. 



Station 2, 805 fms. 



Basilissa alta Watson [loc. cit., p. 597). 

 Station 43, 339 fms. 



Basilissa costulata Watson {loc. cit., p. 600). 



Yucatan Strait, 640 fms. Sigsbee, Station 50, 119 fms; Sand Key, 15 

 fms. 



I apply this name provisionally to a shell which may prove to be the adult 

 of Watson's species, but which requires further investigation. If so, the mouth 

 is well provided with thick internal denticulations when grown, and the pillar 

 is stout and involved. It seems to have no operculum ! 



Leptothyra (induta var. ?) albida n. s. 



Shell stout, solid, heavy, very nacreous, variable in form and sculpture, 

 rather elevated for the genus, dead white or brownish externally, with the 

 usual solid shelly operculum. Whorls five, rounded, apex obtuse, suture dis- 

 tinct ; sculpture of stout revolving ribs, varying from three to six on the upjier 

 side of the whorl crossed by slight plications, most noticeable just below the 

 sutures, but distinguishable also on the base ; the ribs may be few and widely 

 separated, or numerous and close set ; they may near the sutures be nodulated 

 July 12, 1881. 



