356 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



axial lamellae regularly disposed with much wider interspaces; the 

 aperture entire, with a simple, not thickened, margin; umbilicus 

 open, moderately wide. Diameter about 4 millimeters, the height 

 about 3 millimeters. U. S. Nat. Mus. Cat. No. 219130. 



Tyj^e-locality. — Dredged in Nazan Bay, Atka Island, Aleutians, in 

 14 fathoms, sand; W. H. Dall. 



This species is not unlike the typical species of the genus from 

 northern Norway, but is more depressed, the whorls less rapidly 

 enlarging and the umbilicus larger. Owing to the character of the 

 nucleus I am led to believe that this genus is nearer to Velutina than 

 to Trichotro'pis, the radula on its part showing no marked difference. 



COCCUJ.INA CASANICA, new species. 



Shell small, brownish or whitish, darker toward the apex, which is 

 at the posterior third of the shell; both slopes slightly convex, the 

 nuclear point always eroded; sculpture near the apex minutely 

 equally reticulate, the sculpture coarser and the radial threads 

 more prominent than the concentric ones toward the margin; inte- 

 rior polished, the muscular impression perceptible but not conspicu- 

 ous. Length, 5.5; width, 4.5; height, 2.25 mm. U. S. Nat. Mus. 

 Cat. No. 222069. 



Type-locality. — U. S. Fish Commission station 4245, in Kasa-an 

 Bay, Alaska, in 95 fathoms, mud; bottom temperature, 48.9° F. 



ASTKAEA (PACHYPOMA) INAEQUALIS, new variety PACIFICA. 



vShell of moderate size, of a reddish color, trochiform, carinate, of 

 more than five flattish whorls, the apex defective; the carina over- 

 hangs a somewhat obscure suture; axial sculpture of numerous (on 

 the last whorl about 70) obliquely protractive, close-set, rounded 

 riblets, which are cut anteriorly into segments by three rather 

 obscure grooves; these riblets bunched in pairs and swollen, undulate 

 the carina, giving it a somewhat stellate profile; on the base from 

 the carina to the umbilical callus are six deep channeled grooves 

 separated by wider interspaces, which are crossed by numerous 

 minute lamellae; the squarish interspaces obhquely nodulous; 

 aperture diamond-shaped, simple, body with a glaze of enaniel; 

 pillar concavely arched, white, with a callous deposit on the umbilical 

 area behind it. Height, 25; maximum diameter, 42 mm. U. S. 

 Nat. Mus. Cat. No. 222320. 



Type-locality. — Pacific Beach, San Diego, California; Miss J. M. 

 Cooke. 



Compared with the typical inaequale this form is much more finely 

 and delicately sculptured, and the whorl is notably constricted above 

 the peripheral keel. 



