MUSEUM OF COMPARATIVE ZOOLOGY. 273 



I hesitated for some time as to whether this species should he described 

 where I have placed it, or under Cyclostrema. In the absence of the operculum 

 and of the soft parts, it is evident that the question as to its proper classifica- 

 tion can only be decided provisionally, and with due reserve. 



Gottoina compacta n. s. 



Plate XXVIII. Fig. 6. 



Shell small, white, compact, elevated, spirally sculptured, of about four and 

 a half whorls including the nucleus ; outline of the spire convex with hardly 

 any rounding in of the whorls toward the suture, which is nevertheless distinct 

 and finely channelled. Radiating sculpture none, lines of growth not visible; 

 spiral sculpture of fine, close, even, rounded threads, growing gradually smaller 

 from the suture forward ; there is no secondary grooving ; there are about 

 twenty-five threads on the last whorl, but they vary in number and strength 

 with the individual specimen; base full and rounded, imperforate; aperture 

 rounded, pointed behind, and the angle filled with callus; callus continuous, 

 thinnest on the columella. Alt. 2.3 mm.; max. diam. 2.0 mm. 



Habitat. Off Havana, in 84 fms., Sigsbee. Off the coast of North Carolina, 

 U. S. Fish Commission, at Stations 2595, 2596, and 2612. 



Family SOL ARUM}. 



Genus FLUXINA Dall. 



Fluxina Dall, Bull. M. C. Z., IX. p. 51, 1881. 



Fluxina brunnea Dall. 



Plate XXII. Figs. 6,6a. 

 Fluxina brunnea Dall, Bull. M. C. Z., IX. p. 52, 1881. 



Habitat. Station 2, in 805 fms. ; Sigsbee, off Havana, in 80 fms. ; both dead 

 specimens. 



A careful examination of the nucleus in these specimens indicates that it is 

 sinistral and immersed as in other Solariidce. 



An examination of the data relating to the section Episcynia Morch, which 

 has a dextral nucleus, leads to the impression that it does not belong in this 

 family, but perhaps near Adeorbis, or a Vitrinella like multicarinata; at least I 

 can discover no Solariid characters in figure or description. 



Fluxina discula n. s. 



Plate XXIII. Figs. 5, 6. 



Shell small, whitish, polished, of about five whorls, the base of the immersed 

 nucleus looking exactly like a dextral nucleus; surface marked by the fine 

 VOL. xviii. 18 



