374 PKOCEEDINGS OF UNITED STATES NATIONAL MUSEUM, 



Marsenina ampla Verrill, sp. nov. 



Traus. Coun. Acad., v, pi. 42, figs. 3, 3a. 



Shell broad-oval, white, nearly opaque, fragile, with conspicuous lines 

 of growth, but otherwise smooth ; whorls scarcely two ; last whorl very 

 large, constituting nearly the entire shell, and nearly concealing the first 

 whorl, which ai^pears only as a minute incurved nucleus, situated in an 

 apical depression. Aperture broad, oblong-oval, showing the interior 

 of the spire to the apex. Outer lip thin, distinctly expanded and slightly 

 shouldered near the suture, somewhat straight along the right and left 

 sides, regularly rounded in front, slightly excurved where it joins the 

 inner lij), which consists of a narrow and thin coating, conformable to 

 the columella surface, but with a distinct, narrow groove, and with the 

 edge slightly raised as a narrow lamina in the umbilical region. The 

 columella-edge is sigmoid and very much incurved in the umbilical 

 region. 



Length, 11""" 5 breadth, S"""' ; depth of last whorl, 5"™. 



Eastport, Me. Dredged in 1868, by the writer. 



/ 



Velutella cryptospira (MiddeiiiL). 



G. O. Sars, Moll. Reg. Arct. Norv., p. 149, pi. 21, figs 9 a-c. 



A good living example of this shell was taken by us in 1877, off Hali- 

 fax, Nova Scotia, in 57 fathoms (station 82). 



The shell is very thin, translucent, yellowish horn-color, flexible, and 

 but slightly calcified, with no sculpture except fine lines of growth. 

 The spire is small, incurved, and depressed, so that the apical whorl is 

 not visible in a front view. The aperture is elongated. The outer lip 

 expands rather abruptly posteriorly, and is prolonged anteriorly. 



Length, 8'"'"; breadth, 5'""'; length of aperture, 6.5™". 



Trichotropis conica MiJller. 



KiOyei's Ti<lss., iv, p. 85, 1842.— G. O. Sars, op. clt., p. 163, pi. 13, fig. 3. 



A single dead, but large and characteristic, sj^ecimen of this very dis- 

 tinct species was taken in the Gulf of Maine, off Cape Sable, Nova Scotia, 

 in 75 fathoms, by the United States Fish Commission i)arty, on the 

 " Speedwell ", in 1877. It is easily recognized by its conical spire and its 

 flattened base, covered with revolving grooves and ridges. The revolv- 

 ing ribs on the spire are stronger than those on the base, and unequal. 



Rissoa (Cingula) harpa Verrill, sp. nov. 



Shell small, white, translucent, acute-conical, with five very convex, 

 rounded whorls and deeply impressed sutures; body-whorl large; api- 

 cal whorl vei'y small, smooth, regular. Sculi)ture very regular, well- 

 raised, rounded, transverse ribs, about twenty-six on the last whorl, sep- 

 arated by sj)aces rather wider than the ribs ; and fine, close, microscopic 

 spiral lines, which cover the interspaces. Aperture nearly circular, 

 slightly effuse in front. Outer lip thin, regularly rounded ; inner lip 

 retiexed in the umbilical region, and continued on the body-whorl only 



