WEST AMERICAN PYKAMIDELLID MOLLUSKS. 



39 



The type has seven post-nuclear turns and measures : Length 3 mm., 

 diameter 1 mm. It is Cat. no. 195942, U.S.N.M., and comes from 

 Monterey, California. Another specimen (Cat. no. 160488, U.S.X.M.) 

 was collected by Doctor Dall at the same place. 



TURBONILLA (CHEMNITZIA) KELSEYI, new species. 

 Plate 2, figs. 16, 16a. 



Shell small, semitransparent. Nuclear whorls small, two and one- 

 fourth, depressed, helicoid, having 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 moderately rounded, orna- 

 mented by somewhat sinuous, slightly protractive, rounded axial 

 ribs, which are lower and somewhat expanded at the slightly shoul- 

 dered summits of the whorls; 14 of these appear upon the third, 16 

 upon the fourth, 18 upon the fifth, 20 upon the sixth and seventh, 

 22 upon the eighth, and 24 upon the penultimate post-nuclear whorl 

 of the type. Intercostal spaces only moderately impressed, about as 

 wide as the ribs. Sutures well impressed. Periphery of the last 

 whorl well rounded. Base moderately long, well rounded. Aper- 

 ture suboval, posterior angle obtuse; outer lip thin, showing the 

 external sculpture within; columella short, stout, twisted, provided 

 with a weak fold at its insertion. 



The type (Cat. no. 46506, U.S.N.M.) comes from San Diego, Cali- 

 fornia. It has lost the nucleus and probably the first two ])ost- 

 nuclear turns, and measures: Length 4.7 mm., diameter 0.9 mm. 

 The nuclear whorls were describetl from a specimen of lot Cat. no. 

 56789, U.S.N.M. ' 



The following specimens have been examined : 



U.S.N.M. 

 Cat. no. 



56789 

 152197 

 152314 



60916 

 162435 



46503 

 106513 

 162432 



No. Of 

 speci- 



Depth, 

 fath- 

 oms. 



3 



22 



2 10 



2 



I r:::: 



2 i 



1 I 



Locality . 



Santa Barbara, California 



San Pedro, California 



Ocean Beacli, San Diego, California. 



San Diego, California 



Pacific Beach, San Diego, California. 

 Todos Santos Bay, Lower California 



Point Abreojos, Lower California 



San Ignacio, Lower CaUfornia 



Disposition of 

 material. 



U. S. Nat. Mus 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



Named for Prof. F. W. Kelsey. 



TURBONILLA (CHEMNITZIA) RAYMOND!, new species. 



Plate 2, figs. 17, 17«. 



Shell acicular, milk-white. Nuclear whorls small, two and one- 

 half, forming a low, helicoid spire, the axis of which is almost at right 

 angles to that of the succeeding turns, in the first of which the nuclear 

 spire is about one-fifth immersed. Post-nuclear whorls well rounded, 



