14 Dall and SartscJi — The Pi/raviideUida. 



Peritreme not continuous, aperture not 

 rissoid 



Subg. Liostomin (). Sars., 1878. 

 Type, lUtisoeUa? ehvTiiea 



Slimpson. 



D- Varices present 



Shell smooth, axial sculjatvire indicated by a few varices, spiral 

 sculpture wanting 



Siibg. Oceanida De Folin, 1870. 



Type, Oceanida (jradata De Fol. 



A^ Early postnuclear whorls sculpture;! differently Froin the later ones 

 Early post nuclear whorls loosely coiled, plain; later ones closely 

 coiled with a spiral keel at the periphery and one at the summit 

 of the whorls; base spirally lirate 



Lysacme subs>'. nov. 



Type, CTtry.saUida rlauHilifin'mia Cpr. 



Early post nuclear whorls axially ribbed, succeeded by one or 

 two strongly spirally and faintly axially lirate whorls; the rest 

 of the whorls are marked by a reticulated sculpture consist- 

 ing of raised axial and spiral cords 



Subg. Obtortio Hedley, ]8!)9. 



Type, Iiissoa pyrrhacme Melville 



and Standen, 1899. 



DESCRIPTIONS OF NEW SPECIES THAT ARE TYPES OF 

 SUBGENERA DEFINED IN FOREGOING SYNOPSIS. 



Pyramidella (Sulcorinella) dodona sp. nov. 



Shell small, elongate-conic, milk-white. Nuclear whorls one and one- 

 half, smooth, obliquely immersed in the first postnuclear whorl. Post- 

 nuclear whorls flattened, moderately shouldered at the summit, having 

 a strong spiral sulcus at the periphery. Base of the last Avhorl well 

 rounded and strongly umbilicated. The summits of the whorls fall a 

 little anterior to the peripheral sulcus of the preceding whorl and cause 

 the part of this, exposed between the sulcus and the summit of the 

 next whorl, to appear as a narrow raised spiral band. Entire surface of 

 the shell crossed by many axial lines of growth and numerous subequal- 

 ly and closely spaced spiral striations. Sutures subchannelled. Aper- 

 ture ovate, posterior angle obtuse, outer lip thin, columella somewhat 

 curved and reflected having a strong oblique fold a little anterior to its 

 insertion; parietal wall covered by a thin callus. 



