NO. 1790. 



WEST AMERICAN ALABINA—BARTSCH. 



417 



immediately surrounding the umbilical area is free from ail spiral 

 sculpture. Aperture very broadly ovate; outer lip thin, showing the 

 external sculpture within; columella slender, strongly curved and 

 slightly revolute; parietal wall glazed with a thin callus. 



The type (Cat. no. 195219, U.S.N.M.) comes from San Pedro, 

 California, and has 8 post-nuclear whorls and measures: Length 

 7.5 mm., diameter 2.7 mm. 



Specimens examined. 



Cata- 

 logue 

 num- 

 ber. 



Locality. 



Number of 

 specimens. 



195219 

 191578 

 32205 

 50449 

 1093G8 

 160095 

 198585 

 198589 

 20G607 



213010 



213011 



195220 

 212035 



212036 



San Pedro Bay, California. . 

 Terminal Island, California. 



San Diego, California 



do 



.do. 

 .do. 

 .do. 

 .do. 



United States Bureau of Fisheries, station 3568, San Diego Bay, California (4 fathoms, 



hard, broken shell bottom) 



United S tales Bureau of Fisheries, station 3573, San Diego Bay, California ( 1 } fathoms, 



mud and sand bottom) 



United States Bureau of Fisheries, station 3572, San Diego Bay, California (2 fathoms, 



mud and sand bottom) 



Southern California 



United States Bureau of Fisheries, station 3564, San Diego Bay, California (5 fathoms, 



sand, mud, and shell bottom) 



United States Bureau of Fisheries, station 3566, San Diego Bay, California (3 fathoms, 



sand and shell bottom) ". 



2 

 41 

 26 

 3 

 1 

 2 

 1 

 1 



24 



5 



11 



3 



57 



ALABINA TENUISCULPTA PHALACRA, new subspecies. 



Plate 61, fig. 5. 



Shell broadly elongate-conic, light chestnut brown. Nuclear 

 whorls 2h, small, increasing regularly in size, smooth. Post-nuclear 

 whorls slightly shouldered at the summit, marked by slender, axial 

 ribs, of which 18 occur upon the first to fourth, 20 upon the fifth and 

 sixth, and 24 upon the penultimate turn. Upon the early whorls the 

 ribs are almost vertical ; on the last two they are decidedly retractive. 

 Here also they are less regular. In addition to the axial ribs, the 

 whorls are marked by three obsolete spiral cords, of which one is 

 median, another a little nearer to the median cord than the summit, and 

 the third about halfw^ay betw^een the median and the suture. Periph- 

 ery and base of the last whorl inflated, the latter narrowdy umbilical, 

 marked by five subequal subobsolete cords. The space immediately 

 about the umbilical area is smooth. Aperture very broadly ovate; 

 posterior angle obtuse ; outer lip thin, showing the external sculpture 

 within; columella slender, curved, and slightly revolute; parietal 

 w^all glazed w^ith a thin callus. 



The type and another specimen (Cat. no. 32205a, U.S.N.M.) come 

 from San Diego. The type has 8 post-nuclear whorls, and measures: 

 Lejigth, 7.5 mm.; diameter, 3 mm. 



Proc. N. M . vol. 39—10 29 



