NO. 2207. WEST AMERICAN MELANELLID MOLLUSKS—BARTSCH. 329 



MELANELLA (BALCIS) CATALINENSIS, new species. 



Plate 40, fig. 7. 



Shell elongate-conic, slender, doubly flexed, the main flexure being 

 turned to the right, while the extreme tip is slightly bent backward; 

 bluish-white, polished. First two whorls well rounded, separated by 

 a well-constricted suture, the rest moderately rounded on the convex, 

 and shghtly so on the concave side of the spire, separated by a scarcely 

 defined suture. The posterior limit of the whorls shines through the 

 substance of the shell and appears as a conspicuous false suture. 

 Periphery of the last whorl slightly angidated. Base moderately 

 produced, well rounded. Aperture oval; posterior angle acute; 

 outer lip produced at the periphery; inner lip somewhat sinuous, 

 very oblique, slightly reflected and appressed to the base; parietal 

 wall covered with a thick callus. 



The type (Cat. No. 173802, U.S.N.M.) was dredged in Catalina 

 Channel. It has 10 whorls and measures — length, 5.2 mm.; diam- 

 eter, 1.6 mm. 



Number of speci- 

 mens. 



Collection of— 



1 



1 

 1 

 1 



U.S.N.M 



Oldroyd . 

 Cooke... 

 Kelsey . . 



Cata- 

 logue 

 number. 



211822 



Locality. 



Off Santa Rosa Island, sta- 

 tion 2901. 



Off San Pedro 



OS Coronado Islands 



San Hipolito Point 



Remarks. 



48 fathoms, mud bot- 

 tom, .Id" bottom 

 temperature. 



Deep water. 



MELANELLA (BALCIS) FALCATA Carpenter. 



Plate 42, fig. 6. 

 Eulima falcata Carpenter, Proc. Zool. Soc, 1865, p. 280. 



Shell doubly flexed, the anterior portion being turned to the right 

 and the tip backward, yellowish-white. Early whorls decollated, the 

 succeeding turns slightly rounded, more so on the curved than the 

 concave side of the spire, marked by exceedingly fine lines of growth 

 only, separated by a wealdy impressed suture. Periphery of the 

 last whorl subangulated, base moderately produced, well rounded. 

 Aperture ovate; posterior angle acute; outer lip (fractured) ; inner 

 lip short, curved, reflected over and appressed to the base; parietal 

 wall covered by a moderately thick callus. 



Carpenter's type (Cat. No. 123, U.S.N.M.) was collected by Mr.' 

 Rowell at Acapulco, Mexico. It has eight whorls remaining and 

 measmes — length, 7.6 mm.; diameter, 2.2 mm. 



