274 BULLETIN OF THE 



flexuous incremental lines, which do not interrupt the polish, and by faint oc- 

 casional indications of spirals; upper surface of the whorls concave near the 

 sutures, elsewhere flattened, so that the sutural junction is slightly elevated; 

 periphery sharply carinated, base moderately rounded, not impressed near the 

 carina; umbilicus moderate, scalar, its walls smooth and vertical; umbilical 

 margin carinate, an impressed line just outside the carina; aperture wide, mar- 

 gins thin, columella straight, a little thickened, a wash of callus on the body; 

 apparently little if any notch at the end of the umbilical carina. Max. diam. 

 6.5; min. diam. 5.5; alt. 3.0 mm. 



Habitat. Off Dominica, at Station 180, in 982 fms., fine brown ooze, bottom 

 temperature 39°. 7 F. 



This little shell differs from the type of the genus in its want of color, and its 

 scalar instead of funicular umbilicus. It resembles a smooth depressed Basi- 

 lissa in its general aspect, but is not nacreous, and the flexuosity of the margin 

 of the mouth is that of Fluxina rather than of Basilissa. 



Dr. Paul Fischer has placed the Solariidce in the Tsenioglossate division of 

 the Gastropods, rather than with the Ptenoglossa. This arrangement seems 

 more satisfactory than. the old one on several accounts, though the question is 

 beset with difficulties, chief among which is our ignorance of the real characters 

 of the great majority of mollusks, a fact which most systematists are only too 

 ready to overlook. In revealing the Tsenioglossate character of Seguenzia, 

 Prof. VerriH' has done excellent service, though I should be disposed to approx- 

 imate the family to which Seguenzia belongs to the Turritellidce, rather than to 

 forms like Aporrhais. A short-conic partly nacreous Turritella would be very 

 close to Seguenzia, many species exhibiting similar fiexuosities about the mar- 

 gin, while others, like Tachyrynchus, show traces of a canal, and still others 

 marginal sulci. There is no assemblage of species, however, if we include the 

 small trochiform tropical species which have been referred to so many groups 

 and mostly are not known positively to belong to any, which will better repay 

 thorough investigation than those forms which have been referred to the Sola- 

 riidce. Until they have been so investigated, all our classification of them is 

 and will remain unsatisfactory and provisional. 



Genus SOLARIUM Lamarck. 



Solarium granulatum Lamarck. 



Solarium granulatum Lam., An. s. Vert. (ed. Desh.), IX. p. 98. Sby., Thes. Solarium, 



No. 8, figs. 1, 2. 

 Solarium nobile (Bolter.) Hanley, Sby., Thes. Solarium, fig. 36, p. 230, No. 7, 1866. 

 Solarium verrucosum Philippi, Zeitschr. Malak., 1848, p. 72. Sby., Thes. Solarium, 



fig. 35. 



A single broken specimen was dredged off Sombrero, in 54 fms. 



The East and West American forms differ very slightly. If the specimens 

 were found in the same waters, no one would think of distinguishing them by 

 different names. 



