94 BITLLETTN 08, UNITED STATES NATIONAL MUSEUM. 



the sides of the ribs but do not cross them; the peripheral and the 

 third posterior to this are of equal strength and stronger than the rest. 

 The space between the third and fourth above the perihery is a little 

 wider than that between the others, which are about equally spaced. 

 The space between the summit and the first spiral line below it is 

 about equal to about double the space included between the other 

 spirals. A finely incised line divides it into equal areas. Sutures 

 strongly impressed, rendered wavy by the ribs. Periphery well 

 rounded, marked by the feeble continuations of the axial ribs and a 

 few distantly spaced spiral striations. Aperture oval; posterior angle 

 obtuse; outer lip thin, columella moderately strong, sinuous and 

 slightly reflected. 



The type (Cat. no. 73993 U.S.N.M.) was collected by Dr. R. E. C. 

 Stearns at Santa Barbara, California. It has nine post-nuclear 

 whorls and measures: Length 4.8 mm., diameter 1.3 mm. 



TURBONILLA (PYRGISCUS) MARSHALLI, new species. 



Plate 8, figs. 8, 8a. 



Shell very small, slender, light yellow, with a darker band imme- 

 diately posterior to the periphery, and another slender one about 

 halfway between the middle of the space between the sutures and the 

 summit. Nuclear whorls depressed, helicoid, two and one-half, hav- 

 ing their axis at right angles to that of the succeeding turns, in the 

 first of which they are about one-fifth immersed. Post-nuclear 

 whorls high between the sutures, flattened in the middle, gently 

 rounded at the periphery and the summit, marked by slender, retract- 

 ive axial ribs, of which 22 occur upon the first and second, 24 upon 

 the third to fifth, 26 upon the sixth, and 24 upon the penultimate 

 turn. Intercostal spaces a little wider than the ribs, moderately 

 well impressed, marked by seven strong subequal series of pits 

 between the periphery and the subsutural color band, and three fine 

 incised lines posterior to this. Periphery of last whorl well rounded. 

 Base moderately long, marked by the feeble continuations of the 

 axial ribs and five subequal, equafly spaced spiral striations. Aper- 

 ture ovoid; posterior angle acute; outer lip thin, showing the ex- 

 ternal sculpture within; columella very oblique, curved, twisted, and 

 slightly revolute. 



The type and another specimen (Cat. no. 163262, U.S.N.M.) were 

 dredged at U. S. Bureau of Fisheries station 2822, in 21 fathoms, off 

 La Paz, Lower CaHfornia. Thfe type has eight post-nuclear whorls 

 and measures: Length 3.6 mm., diameter 0.8 mm. 



