NO. 2295. ]^EW NORTH PACIFIC M0LLUSK8—DALL. 359 



incremental lines ; base convex with a rather wide umbilicus ; aperture 

 circular, simple, sharp edged; operculum calcareous, multispiral, 

 centrally depressed on the outer side; height, 1; larger diameter, 

 1.5 mm. U. S. Nat. Mus. Cat. No. 31117. 



Type-locality. — Constantine Harbor, Amchitka Island, Aleutians, 

 in seaweed at low water, W. H. Dall. 



CHLOROSTOMA GALLINA, new variety UMBILICATUM. 



Most of the specimens of CMorostoma gallina are imperforate, 

 some have the umbilical callus concave, formmg a sort of pit, and a 

 rare variety has an entirely open, narrow, deep umbilicus. The 

 types of the latter are U. S. Nat. Mus. Cat. No. 152998, and while 

 in other characters similar, are smaller than the average adult 

 gaUina, measuring, height 22 and diameter 25 mm. They were 

 collected by Turrill at San Quentin Bay, Lower California. Other 

 specimens have been found at San Diego, California. 



CHLOROSTOMA BRUNNEUM, new variety FLUCTUOSUM. 



The common form of hrunneum has a nearly smooth surface or a 

 surface affected by incremental rugosities, but there is another form 

 rather widely spread which exhibits well-marked obliquely pro tractive 

 ribs to the number of 18 or 20 on the last whorl, reaching from the 

 suture nearly to the periphery with narrower interspaces. It is 

 rather less elevated than the average of the typical hrunneum and 

 has a more depressed suture. The types of the variety are U. S. 

 Nat. Mus. Cat. No. 60055 and come from Monterey, California. 



OMPHALIUS MARIANUS, new name. 



This is 0. coronatus Pilsbry, 1889, not of C. B. Adams, 1852, and 

 0. turhinatus Pease, 1869, not of A. Adams, 1851. A new name for 

 the species being needed, the above is proposed. The 0. marianus 

 ranges from Santa Barbara, California, to Panama and Paita, Peru, 

 and is U. S. Nat. Mus. Cat. No. 4033. 



CALLIOSTOMA COSTATUM, new variety CAERULELM. 



Shell resemblmg the ordinary typical form except that the apex 

 and part of the whorls in front of the suture are colored with bands 

 of a brilliant mazarin blue when fresh, but which, unfortunately, 

 fades after a few years m the cabinet. Fresh specimens have a 

 very different aspect from the common shells carrying reddish 

 spiral lines on a yellowish ground. Typical specimens in the National 

 Collection come from Monterey, California, and bear the catalogue 

 number 59808. 



CALLIOSTOMA COSTATUM, new variety PICTUM. 



These shells resemble the type except that on the periphery of the 

 whorl, and sometimes on the whorl between the periphery and the 



