94 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 109 



at 175 feet; 2 of these are 5.5 mm., 1 is 18 mm., and the others average 

 12.2 mm. in length. Nine specimens (from 5 to 17 mm.) came from 

 453 feet; 6 (from 9 to 20 mm.) from 341 feet; and 6 (from 11 to 18.5 

 mm.) from 216 feet. 



Other material examined: Specimens from the Sea Horse 

 Islands, Nunivak Island, St. Paul Island, and the Sea of Okhotsk. 



Discussion: The shells are covered with a yellowish periostracum 

 that is worn away only in a small area at the apex. With the excep- 

 tion of 5 specimens, all of the Point Barrow shells of this species are 

 white inside; the insides of the 5 specimens are marked with radiating 

 lavender rays (pi. 5, fig. 5). Of the specimens examined from other 

 localities, only 3 are from north of the 60th parallel: 1 from the Sea 

 Horse Islands, 1 from "north of Bering Strait," and 1 from the "Arctic 

 Ocean." Nearly all of the specimens examined from south of Bering 

 Strait are characterized by the radiating lavender rays on the inside 

 and even in some of the specimens that appeared white the rays could 

 be detected by holding the shell to the light. 



Distribution: This species ranges from Point Barrow to the 

 Pribilofs, Bering Sea, and the Sea of Okhotsk. Johnson (1934) and. 

 LaRoque (1953) give the Atlantic range as "off Nova Scotia in 150 

 fathoms." 



Genus Velutina Fleming, 1820 



Velutina undata Brown, 1839 

 And var. zonata Could, 1841 



Plate 6, figures 1-3 



Velutina undata Brown ^ in Smith, 1839, p. 102, pi. 1, fig. IS.^Brown, 1849, p. 



255.— Odhner, 1913, pp. 11, 55, pi. 2, figs. 1-10, 15; pi. 5, figs. 27, 28. 

 Velutina zonata Gould, 1841, p. 242, fig. 160. 

 Morvillia undata G. Sars, 1878, p. 147, pi. 21, figs. 7a-b. 



Six specimens were collected: 2 shells (23 mm. and 27.5 mm. long) 

 from Eluitkak Pass on Aug. 10, 1948; 1 shell (10 mm.) from 204 feet; 1 

 living specimen (4.5 mm.) from 217 feet; 2 specimens (8 mm. and 19.6 

 mm.) from 453 feet; and 1 living specimen (15 mm.) from 741 feet. 



Other material examined: One specimen from Lofoten Island, 

 Norway; 2 from Spitzbergen; about 55 from localities from Murray 

 Bay, Quebec, to Eastport, Maine; over 20 from localities from Icy 

 Cape to the Kudobin Islands. 



' European authors list this species as "Velutina undata Brown, 1838," and Sherbom fl932) as "Velutina 

 undata Smith, 1839." The latter date is correct, but the description should be credited to Brown. On page 

 102 of Smith (1839) a heading for the description of this species appears as " Velutina undata. n. s.— Smith," 

 but the end of the description on page 103 is followed by "—R." In a footnote on page 98, Smith states 

 "The descriptions marked B, I owe to Mr. T. Brown, and those marked F, to Mr. Edward Forbes." In 

 view of the heading to the description, it is small wonder that Sherbom credited the description to Smith. 



