AET. 20 ADDITIONAL MOLLUSKS FROM ECUADOR BAETSCH 17 



covered with a very thick calhis which renders the peritreme com- 

 plete. 



The type (Cat. No. 363094, U.S.N.M.) has five and one-half post- 

 nuclear whorls and measures, length, 3 mm. ; diameter, 1.2 mm. 



MELANELLA (BALCIS) CAPA, nev/ scccies 



Plate 3, fig. 2 



Shell small, slender, falciform, bluish-white, semitranslucent. 

 Nuclear whorls decollated. Postnuclear whorls appressed at the 

 summit, flattened, marked b}^ incremental lines only; the portion at 

 the summit appressed to the preceding turn, marked anteriorly by a 

 conspicuous zone which gives to the whorls the effect of a double 

 suture; in fact, this line is much more conspicuous than the actual 

 suture which is scarcely apparent. Periphery of the last whorl well 

 rounded. Base moderately long, strongly rounded on the left margin. 

 Aperture moderately large, pear-shaped; posterior angle decidedly 

 acute; outer lip slighth' protracted in the middle into a clawlike 

 clement; inner lip somewhat curved, reflected over and appressed to 

 the base for its entire length. 



The type (Cat. No. 363097, U.S.N.M.) has eight whorls, having 

 lost the nucleus and probably the first postnuclear whorls, and 

 measures, length, 3.8 mm.; diameter, 1.4 mm. 



MELANELLA (BALCIS) TL4, new species 



Plate 3, fig. 1 



Shell broadly conic, stout, thick, semitranslucent, bluish-white. 

 Nuclear whorls decollated. Early postnuclear whorls slightly 

 rounded, the rest flattened; the portion appressed to the preceding 

 turn at the summit is limited by a conspicuous line which gives to 

 the whorls a double sutured aspect. Suture well marked. Periph- 

 ery of the last whorl short, inflated, and well rounded. Base short, 

 well rounded. Aperture oval ; posterior angle acute ; outer lip thin ; 

 inner lip short, stout, reflected over and appressed to the base for 

 two-thirds of its length ; parietal wall covered by a moderately thick 

 callus. 



The type (Cat. No. 363096, U.S.N.M.) has seven and one-half 

 whorls and measures, length, 3.9 mm.; diameter, 1.5 mm. 



STROMBIFORMIS HUA, new species 



Plate 3, fig. 3 



Shell moderately large, acicular, slender, bluish-white, semitrans- 

 lucent, showing the internal structure. Nuclear whorls decollated. 

 Postnuclear whorls flattened, appressed at the summit, the appressed 



