NO. 2207. M'EST AMERICAN MELANELLID MOLLVSKS—BARTSCH. 341 



lip is edged with pale brown. Early whorls moderately well rounded, 

 separated by a well-impressed suture; succeeding turns flattened and 

 separated by a scarcely defined suture. Surface marked by exceed- 

 ingly fine retractive lines of growth and an occasional narrow varicial 

 streak. Periphery of the last whorl well rounded. Base somewhat 

 produced, well rounded. Aperture elongate ovate; posterior angle 

 acute; outer lip thin; inner lip strong, curved, reflected over and 

 appressed to the base throiighout its entire length; parietal wall 

 glazed with a thick callus. 



The type and three specimens (Cat. No. 251391, U.S.N.M.) were 

 dredged by the United States Bureau of Fisheries steamer Albatross 

 at station 2S22 off La Paz, Gulf of California, in 21 fathoms on gray 

 sand and broken shell bottom. The type has 13 whorls and meas- 

 ures — length, 11 mm.; diameter, 2.5 mm. 



The following additional specimens have been examined: 



STROMBIFORMIS LAPAZANA, new species. 



Plate 46, fig. 3. 



Shell narrowly subulate, polished, tip yellowish-white, the rest 

 flesh-colored with a broad translucent zone of light brown, which is 

 edged on either side by a narrow vary dark band, the anterior one 

 of which marks the periphery, while the posterior faUs a little ante- 

 rior to the middle of the space between the summit and the suture. 

 Early whorls rounded, separated by a well-marked suture, all the 

 rest flattened, marked by feeble lines of growth and an occasional 

 pale bro'^Ti retractive varicial streak. Suture poorly defined. Pe- 

 riphery of the last whorl well rounded. Base produced, well rounded. 

 Aperture elongate-ovate, slightly effuse anteriorly; posterior angle 

 acute; inner lip short, curved, revolute, reflected over, and appressed 

 to the base; parietal wall covered with a moderately thick callus. 



The type and 43 specimens (Cat. No. 211388, U.S.N.M.) were 

 dredged by the United States Bureau of Fisheries steamer Albatross 

 at station 2823, in 2Qh fathoms off La Paz, Gulf of California, on 

 broken shell bottom. The type has 13 whorls and measures — length, 

 7.8 mm.; diameter, 1.3 mm. 



