322 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 53. 



MELANELLA (BALCIS) ARNOLDI, new species. 



Plate 40, fig. 8. 



Shell broadly conic, with very slight flexure; milk-white. Early 

 whorls well rounded, separated by a well-constricted suture, later 

 ones almost flattened, appressed at the summit with a very poorly 

 defined suture. Periphery weakly angulated. Base short, well 

 rounded. Aperture broadly oval; posterior angle acute; outer Hp 

 protracted in the middle; inner lip short, shghtly sinuous, reflected 

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

 callus. 



Tlie type (Cat. No. 215765, U.S.N.M.) was collected at Sand Rock, 

 Lower San Pedro Series, Dead Man's Island, Cahfornia. It has 11 

 whorls and measures — length, 5.5 mm.; diameter, 2.1 mm. Another 

 specimen from the same locality is in ^Ir. Arnold's collection; still 

 another from San Pedro is also in Mr. Arnold's collection. 



MELANELLA (BALCIS) COSMU, new species. 



Plate 40, fig. 6. 



Shell very small, broadly conic, flexed to the right; bluish-white; 

 semi translucent; poUshed. The first three whorls well rounded, 

 separated by a moderately weU-constricted suture; the rest sUghtly 

 rounded, with scarcely defined suture. Periphery of the last whorl 

 weakly angulated. Base short, well rounded. Aperture very broadly 

 ovate; posterior angle acute; outer hp strongly protracted a httle 

 anterior to the middle; inner lip curved, reflected over and appres- 

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



The type and three specimens of tliis species (Cat. No. 105580, 

 U.S.N.M.) were collected by Mr. Henry Hemphill at Point Abreojos. 

 The type has nine whorls and measures — length, 2.7 mm.; diameter, 

 1 mm. Mr. Kelsey's collection contains two from the same place, 

 while Mrs. Oldroyd's collection has two from the same locality and 

 two labeled Lower Cahfornia, without specific locality. 



MELANELLA (BALCIS) HALIA, new species. 



Plate 40, fig. 2. 



Shell very minute, translucent, shov/ing the entire internal struc- 

 ture within, shghtly flexed in one direction at the tip. Whorls very 

 evenly rounded, separated b}^ a rather strongly marked suture, pol- 

 ished, wdthout sculpture excepting shghtly impressed varicial streaks 

 at irregular intervals. Periphery of the last whorl well rounded. 

 Base short, slightly inflated, well rounded. Aperture small, oval; 

 posterior angle acute; outer hp thin, shghtly protracted in the mid- 

 dle; inner lip short, shghtly curved, reflected over and appressed to 

 the base; parietal wall covered by a moderately thick callus. 



