NO. 2295. ifEW NORTH PACIFIC MOLLUSKS—DALL. 357 



ASTRAEA (PACKYPOMA) BARBARENSIS, new species. 



Shell of moderate size, trochiform, white, covered by a reddish- 

 brown periostracum, with six or more flattish whorls, the nucleus 

 defective; suture rather obscure, not appressed; axial sculpture of 

 (on the last whorl about 30) rounded, protractively oblique ribs, 

 with equal or wider interspaces, reaching from the suture to the 

 periphery which they undulate; haKway from the suture to the 

 periphery these are cut into segments by three deeply incised 

 grooves; there may be, near the periphery, a few intercalary short 

 ribs; there are also fine, close, inconspicuous incremental lines; on 

 the base inside the undulate border are five strong regularly beaded 

 cords with narrov/er channeled interspaces; aperture subquadrate, 

 the upper part of the outer lip much produced; the body glazed, 

 the pillar concavely arcuate, ending in a blunt projection, behind it 

 a porcellanous white semilunar callus around the imperforate umbili- 

 cal depression; height of shell, 26; of aperture, 12; diameter, 37 

 mm. U. S. Nat. Mus. Cat. No. 223819. 



Type-locality. — U. S. Fish Commission station 2945, off Santa 

 Cruz Island of the Santa Barbara group, California, in 30 fathoms, 

 gravel, bottom temperature 56° F. 



The operculum, blackish brown inside, of about two whorls, 

 resembles that of P. inequale, but is more slender and somewhat 

 concave. 



ASTRAEA (PACHYPOMA) SPIRATA Dall. 



Pachyvoma inaequale var. spiratum Dall, Na'atiliis, vol. 24, p. Ill, 1911. 



Shell trochiform, elevated, solid, of a reddish color with nacreous 

 substratum, of more than six carinated flattish v^^horls, the apex, 

 eroded; suture obscure, slightly overhung by the carina which is 

 blunt and undulated; axial sculpture of (on the penultim_ate whorl 

 about 20) protractively oblique rounded irregular ribs extending 

 from the suture to the edge of the carina with wider interspaces, 

 and cut into nodules by three or four equally spaced spiral grooves; 

 the evident, almost lamellose, retractively oblique incremental lines 

 cross the ribs and interspaces almost at right angles; the flattish 

 base has five sharp channeled grooves with regularly spaced wider 

 squarish interspaces between the imperforate depressed umbilical 

 area and the carina; aperture obliquely rhombic, simple, the body 

 with a thin glaze, the pillar nacreous, concavely arcuate, the outer 

 lip simple produced above; height of shell, 32; of last whorl, 19; of 

 aperture, 11; maximum diameter, 31 mm. U. S. Nat. Mus. Cat. 

 No. 222318. 



Type-locality. — Gulf of Cafifornia; Miss J. M. Cooke. 



This is the most elevated and smallest of the subgenus in west 

 American waters. The examination of a number of specunenB 



