HE NAUTILUS. 



VOL. XXX. NOVEMBER, 1916. No. 7 



EULIMASTOMA, A NEW SUBGENUS OF PYRAMIDELLIDS AND REMARKS 

 Off THE GENUS SCALENOSTOMA. 



BY PAUL BARTSCH. 



Additional material received by the United States National 

 Museum makes it necessary to create a new subgenus for the 

 Pyramidellida typified by Odostomia (Scalenostoma) dotella Dall 

 and Bartsch (Bull. 68, U. S. N. M., p. 230, 1909). Scalenostoma 

 must be referred to the family Melanellidae (= Eulimidae) . 



There is a wonderful resemblance between Eulimastoma and 

 Scalenostoma as far as texture of shell and sculpture are con- 

 cerned, and it was this resemblance and the absence of repre- 

 sentatives of the genus Scalenostoma that caused me to consider 

 this a Pyramidellid in the past. Material now at hand shows 

 that Odostomia (Eulimastoma') dotella Dall and Bartsch has an 

 obliquely tilted, deeply immersed nucleus, a Pyramidellid 

 character, while Scalenostoma has the usual attenuated, acute, 

 non-sinistral tip. 



The following synonymy should be noted : 



Scalenostoma Deshayes, Cat. Moll. He de la Reunion, pp. 58- 

 60, PI. vii, figs. 26-8, 1863. Type Scalenostoma carinatum Des- 

 hayes=Subeulima Souverbie, Journ. de Conch, xxiii, p. 296, 

 1875. Type Subeulima lamberti Souverbie. 



The west American members of the genus Scalenostoma are: 



SCALENOSTOMA RANGII (de Folin). 



Chemnitzia rangii de Folin. Les Meleagrinicoles p. 61, PI. 6, 

 fig. 1, 1867. Odostomia (Scalenostoma) rangii, Dall and Bartsch 

 Bull. 68, U. S. N. M., p. 230, PI. 30. fig. 2, 1909. Odostomia 



