ART. 20 ADDITIONAL MOLLUSKS TROM ECUADOE — BAKTSCH 19 



far more marked than the real suture. Periphery well roundeil. 

 Base rather long, well rounded, the posterior half flesh-colored, the 

 anterior half brown. Aperture pyriform; the posterior angle de- 

 cidedly acute ; outer lip slightly protracted in the middle ; inner lip 

 oblique, slightly curved, reflected over and appressed to the base; 

 parietal wall covered with a thick callus which renders the peritrcmc 

 complete ; edge of the outer lip brown. 



The type (Cat. No. 363101, U.S.X.M.) has nine and one-half 

 whorls and measures, length, 6.5 mm. ; diameter, 1.6 mm. Cat. Xo. 

 363102, U.S.N.^I., contains another specimen. 



STROMBIFORMIS PARIA, new species 

 Plate 3. fig-. 8 



Shell large, acicular, varying in color from bluish-white to brown. 

 Nuclear whorls decollated. Early postnuclear whorls moderately 

 rounded, the latter flattened. Summit of the whorls exceedingly 

 attenuated and appressed. The posterior limit of the bod}^ cavity 

 shines through the substance of the shell and appears as a false 

 suture. The surface of the shell is marked by incremental lines and 

 irregularis^ distributed varices. Periphery of the last whorl well 

 rounded. Base rather long, attenuated, well rounded. Aperture 

 l^yriform; posterior angle acute; outer lip thin, slightly protracted 

 in the middle; inner lip rather stout, reflected over and appressed to 

 the base; parietal wall covered by a thick callus which renders the 

 peritreme complete. 



The type (Cat. Xo. 363103, U.S.X.M.) has seven and one-half 

 whorls and measures, length, 10.3 mm.; diameter, 2.5 mm. Cat. Xo. 

 363101, U.S.X.M., contains eight additional specimens. 



EXPLANATION OF PLATES 



(All figures are those of the types) 



Plate 1 



rag. 



Fig. 1. Turbonilla (^trioturboiiilla) cuiui 6 



2. TurhonlUa (Striofurbonilla) capa, tip 6 



3. Turbonilla (Pyrgiscus) mava 9 



4. Turbonilla {Pyrgiscus) collea S 



5. Turbonilla (Strioturbonilla) hua 4 



G. Turbonilla (Pyrgiscus) mora, detail of sculpture 9 



7. Turbonilla {Chemnitsia) rimaca 4 



8. Turbonilla (Strioturbonilla) ata 5 



9. Turbonilla (Strioturbonilla) caca 5 



10. Turbonilla (Pyrgiscus) aya 9 



11. Pyramidella (Triptychus) olsso>)i 2 



