NO. 2207. WEST AMERICAN MELANELLID MOLLUSKS—BARTSCH. 321 



The following additional specimens have been examined : 



Number of speci- 

 mens. 



11. 

 8.. 

 1.. 

 5.. 

 7.. 

 20. 

 2.. 



Collection of— 



U.S.N.M.... 



do 



do 



do 



do 



Baker 



nutton 



6 : Cooko 



2 Kelsev... 



18 Oldroyd.. 



3 ! U.S.N.M. 



17 i Oldroyd.. 



2 



1 



1 



3 



Cooke. 



U.S.N.M 



Johnston 



Oldroyd 



Catalogue 

 number. 



251264 

 215763 

 273993 

 127543 

 130613 



106516 

 268583' 



Locality. 



Lower California. . . 



San Diego 



do.^ 



San Hipolito Point. 



do 



do 



do 



do 



do 



do 



Point Abreojos 



do 



Mapdalona Bay 



Lower California. . . 



do 



do 



Remarks. 



On Haliotig. 



J Type. 

 MELANELLA (BALCIS) LASTRA, new species. 



Plate 40, fig. 3. 



Shell small, conic, only very shghtly flexed; bluish-white, semi- 

 translucent; polished, marked by exceedingly fine lines of growth 

 only. The first three whorls well rounded, separated by a well- 

 impressed suture, the rest very slightly rounded, with a scarcely 

 defined suture. Periphery well rounded. Base short, well rounded. 

 Aperture very broadly oval; posterior angle acute; outer lip decidedly 

 protracted a httle anterior to the middle; inner hp short, curved, 

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

 thick caUus. 



This species is similar to M. peninsularis, but is uniformly more 

 slender, with the varices much less conspicuously marked. 



The type and three specimens (Cat. No. 105519, U.S.N.M.) were 

 collected by Mr. Henry Hemphill at Point Abreojos, Lower Cahfomia, 

 The type, an adult shell, which has lost probably the first two whorls, 

 retaining eight, measures — length, 4.1 mm.; diameter, 1.6 mm, 

 Another, an immature specimen of nine whorls, measures — length 

 2.6 mm.; diameter, 1 mm. 



The following additional specimens have been examined: 



77403— Proc. N. M. vol. 53—17- 



Type. 

 -21 



