506 pnocEsmms of the national museum, vol.xxxhi. 



them. The space l)etween the second and third lines appears slightly 

 nodulose on the ril)s. Periphery of the last turn angulated, crossed 

 by the continuations of the ribs, which disappear as they pass on to 

 the short and well-rounded base. Base marked by 13 continuous 

 incised spiral lines of about equal strength which are much more 

 closely spaced near the mnbilicus than the periphery, the distance 

 between the succeeding striations diminishing in regular ratio from 

 the periphery to the umbilical area, the first two below the periphery 

 beitig considerably more distantly spaced than the rest, the spaces 

 inclosed between them being about equal to the space inclosed 

 between the spiral lines on the spire. Aperture subquadrate, posterior 

 angle acute, outer lip thin, showing the external sculpture within; 

 columella slender, oblique, somewhat twisted and slightly revolute. 



The type (Cat. No. 173081, U.S.N.M.) has 9 post-nuclear whorls 

 and measures: Length 6.4 mm., diameter 2 mm. It was collected 

 by Mr. H. N. Lowe at Long Beach, California. Another specimen is 

 in the collection of the University of California from Station No. 1'22, 

 near Redondo. Another (Cat. No. 176622, U.S.N.M.) was dredged 

 by Mr. John Paine in 8 fathoms off Catalina Island. Five (Cat. No. 

 196230, U.S.N.M.) were collected by Mr. H. N. Lowe at San Diego, 

 and four additional specimens from the same locality are in Mr. 

 Lowe's collection. One, collected at Station No. 83, off San Diego, is 

 in the collection of the University of California. 



A specimen collected by Mr. S. S. Berry in 29 fathoms off" New 

 Monterey, Monterey Bay, California, is provisionally placed here 

 until more material can be examined. It agrees with T. {P.) morcld 

 in general form and type of sculpture, but is much more slender and 

 has more ribs. 



This species is nearest related to Turhonilla {Pyrgiacus) latifundia 

 Dall and Bartsch, from the post-Pliocene of San Pedro, California. 



TURBONILLA (PYRGISCUS) ANTESTRIATA, new species. 



Plate XLV, figt^. 4, 4a. 



Shell large and strong, light brown. Nuclear whorls 2^, small, 

 smooth, forming a depressed rounded helicoid spire, which projects 

 somewhat beyond the left side of the outline of the spire of the later 

 whorls and has its axis at a right angle to the axis of these, being 

 about one-fourth immersed in the first turn. Post-nuclear whorls 

 slightly rounded, ornamented by low, rounded, narrow, vertical axial 

 ribs which become decidedly flattened and enfeebled near the summit 

 of the turns; there are 9 of these ribs on the second, 20 upon the fifth, 

 and 28 upon the penultimate post-nuclear turns. Intercostal spaces 

 about double the width of the ribs, shallow, rounded, crossed b}^ 6 

 equal and equally spaced, strongly incised, spiral lines which extend 



