ball: mollusca and brachiopoda. 337 



of the pillar ; there is a heavy callus on the body which is attenuated at the side 

 of the umbilicus, while in solutus the callus is comparatively thin on the body and 

 has a broad reflection nearly covering the narrow umbilicus. TLe shell has about 

 four whorls, and an adult measures-, alt. of shell, 22.0; of last whorl, 19.5 ; of 

 aperture, 14.0 ; max. diam. 18-0 mm. 



Stations 2778 and 2779, Magellan Strait, in 61 to 77 fathoms, ooze, bottom 

 temperature 47° F. U. S. N. Mus. 97,126 and 106,873. Also at Laredo Bay 

 iu the strait. 



After careful and repeated comparisons I cannot make this shell agree with any 

 of those illustrated in Strebel's valuable account of the shells of this vicinity, and 

 it is certainly not identical with the shell figured by Gould as his Natica soluta. 



Polinices (Euspira) constrictus Dall, n. sp. 



Shell solid, smooth except for lines of growth, polished white or grayish, hav- 

 ing five and a half whorls ; apex rather pointed, slightly elevated, with a closely 

 appressed suture, immediately in front of which the whorl is slightly but distinctly 

 constricted, beyond this the whorl is fully and evenly rounded ; the edge of the 

 whorl at the suture is vertically striated by the more emphatic incremental lines, 

 but these striae do not pass in front of the constriction ; under a good lens the 

 entire surface is seen to be microscopically closely evenly striated ; aperture ovate, 

 outer lip thin and sharp, body with a thick callus, proximal end of the pillar 

 heavily callous, but the callus, though partially overflowing the umbilicus, has no 

 umbilical lobe or sulcus such as is seen in Neverita ; anterior part of the pillar 

 wide, depressed ; umbilicus narrow, funicular, with a spiral impressed ascending 

 line anteriorly. Alt. of shell, 20.0; of last whorl, 18.0; of aperture, 13.0; max. 

 diam. 17.0 mm. 



U. S. S. " Albatross," station 2780, Magellan Strait, in 369 fathoms, mud, bot- 

 tom temperature 47°.0 F. U. S. N. Mus. 97,065. 



An elegant little species having somewhat the aspect of a small Neverita. 



Polinices (Euspira) litorinus Dall, n. ep. 



Shell small, solid, de[)rcsscd, with almost exactly the form of Littorina palliata 

 Say, milk-white with a pale straw-colored periostracum, and al)out tlircc and a 

 half whorls; surface smooth, except for faint incremental and occasional obsolete 

 spiral lines, not polished ; suture distinct, almost appressed ; whorls rounded ; 

 aperture ample, ovate ; outer lip sharp, body with a heavy white callus, which 

 extends downward and almost entirely fills the umbilicus, leaving only a miuute 

 fissure open; the umbilical region but slightly indented; operculum ]>aucispinil, 

 light brown, horny, of about two whorls, the nucleus in the anterior fourth of its 

 total length. Alt. of shell, 9; of last whorl, 8.5; of aperture, 7.5; max. diam. 

 8.5 mm. 



VOL. xnn. — NO. 6 22 



