NO. 2207. WEf!T AMERICAN MELANELLID MOLLUSKS—BARTSCH. 327 



mass of the shell as a false suture. Periphery of the last whorl well 

 rounded. Base short, somewhat inflated anteriorly. Aperture ob- 

 lique, broadly oval; posterior angle very acute; outer lip strongly 

 protracted between the base and the posterior angle, the greatest 

 extension falling at the periphery; inner lip obhque, slightly sinuous, 

 reflected over and appressed to the base; parietal wall covered with 

 a strong callus. 



The type (Cat. No. 216820, U.S.N.M.) was dredged in 12 fathoms off 

 Del Monte, Monterey, Cahfornia, by Dr. S. S, Berry. It has 12 whorls 

 and measures — length, 6 mm.; diameter, 2 mm. 



Cat. No., 193697, U.S.N.M., contains another specimen dredged 

 by the United States Bureau of Fisheries steamer Albatross, off 

 Catalina Island. 



MELANELLA (BALCIS) PREFALCATA, new species. 



Plate 42, fig. 4. 



Shell elongate-conic, yellowish-white, doubh^ flexed, the anterior 

 portion being turned to the right and the tip backward. Early 

 whorls slightly rounded, separated by a well marked suture, the suc- 

 ceeding turns appressed at the summit, moderately rounded on the 

 curved side of the shell and slightly so on the concave side of the spire, 

 marked by exceedingly fine lines of growth only. Sutures scarcely 

 indicated. Periphery shghtly angulated. Base somewhat produced, 

 well rounded. Aperture moderately large; posterior angle acute; 

 outer lip decidedly protracted at the peripheral angle; inner lip short, 

 curved, reflected over and appressed to the base; parietal wall cov- 

 ered "vsith a tliick callus. 



The type (Cat. No. 215774, U.S.N.M.) comes from the Lower San 

 Pedro Series, Sand Rock, Dead Man's Island. It has 1 1 whorls and 

 measures— length, 6.9 mm.; diameter, 2 mm. Five additional speci- 

 mens are entered under the same catalogue number and 16 are in 

 Doctor Arnold's collection, by whom they were collected. Three 

 additional specimens without locality are in Arnold's collection. 



The species resembles closely falcaia, but differs from it by its 

 comparatively longer aperture. 



MELANELLA (BALCIS) GRIPPI. new species. 



Plate 42, fig. 5. 



Shell elongate-conic, moderately stout, doubly flexed; the anterior 

 portion is turned to the right, while the tip is bent backward; pol- 

 ished, marked by exceedingly fine lines of growth only; milk-white, 

 except where the dried animal sliines through the textme of the shell 

 where it appears yellowish-brown, or where varices cross the whorls, 

 behind which there is always an opaque area. First five whorls well 



