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21:0568 Genus Scalenostoma Deshayes, 1863. 
| Melanellids having an acute keel at the periphery of the 
whorls. 
21:0569 Scalenostoma rangii (De Folin 1867 sub Chemnitzia). 
Type locality: ——-Negritos; or Margarita Island, Panama. Dall. 
and Bartsch have previously referred this to Odostomia. 
21:0570 Scalenostoma babylonia (Bartsch 1912 sub Odostomia). 
Type locality:—San Hipolito Point, Baja Cal, 
21:0571 Genus Strombiformis Da Costa, 1878. 
Very attenuated, slender Melanellids, with very narrow elon- 
gated aperture, having the inner lip appressed to the attenuated 
basal portion of the preceding whorls; marked with 1 or more 
spiral color bands. Type, S: glaber. 
21:0572 Strombiformis riversi. Santa Monica canyon, Cal. (Fos- 
sil). 
21:0573 Strombiformis alaskensis. Dutch Harbor, Alaska. 
21:0574 Strombiformis californica. San Diego bay, Cal. Cata- 
lina Isl. 
21:0575 Strombiformis townsendi. Gulf of Cal. 
21:0576 Strombiformis lapazana. La Paz, Baja Ca. 
21:0577 Strombiformis almo. Off Santa Rosa Is., Cal. Off San 
Diego. — 
21:0578 Strombiformis fuscostrigata (Cpr. 1864 sub Eulima). 
Cape San Lucas. 
- 21:0579 Strombiformis panamensis, Panma. 
21:0580 Strombiformis barthelowi. Santa Maria bay, Baja Cal. 
21:0581 Strombiformis hemphilli. Point Abreojos, Baja Cal. 
21:0582 Strombiformis burragei. Gulf of Cal. 
21:0583 Strombiformis varians (Sby. 1834 sub Eulima). Xipixapi. 
21:0584 Strombiformis proca (De Folin 1867 sub Eulima). 
Type locality—Negritos; or Mangarita Island, Panama. 
21:0585 Strombiformis elegantissima (De Folin, 1867 sub 
Eulima). 
Type locality—Negritos; or Margarita Island, Panama, 
21:0586 Strombiformis acuta (Sby. 1834 sub Eulima). Bay of 
Montiji. 
21:0587 Genus Niso Risso, 1826. 
Melanellids having the base broadly vimibittented: Type, N: 
eburnea. 
21:0588 Niso splendidula (Sby. 1834 sub Eulima). 
Type locality:—Sancta Elena, Ecuador. Panama. 
21:0589 Niso excolpa.' Gulf of Cal. 
21:0590 Niso interrupta (Sby. 1834 sub Eulima). 
Type locality:—Gulf of Nicoya, Costa Rica. Panama. 
21:0591 Niso lomana. Off Pt. Loma, Cal. 
21:0592 Niso hipolitensis. San Hipolito Point, Baja Cal. San 
Diego. . 
21:0593 Niso imbricata (Sby. 1834 sub Eulima). Ecuador. 
21:0594 Niso? antiselli Anderson & Martin, 1914. 
Type locality:—-Lower Miocene, San Luis Obispo Co., Cal. 
21:0595 Genus Stilifer Broderip, 1832. 
Melanellids with a mucronate apex, globular form, and the 
inner lip not appressed or adnate to the attenuated base of the 
preceding whorl. Type, S: astericola. 
21:0596 Stilifer astericola Broderip, 1832. Galapagos Islands. 
21:0597 Genus Mucronalia A. Adams, 1860. 
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