140 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i09 



to be hyaline or pearly.) In these 2 specimens the spire is very much 

 sunken and is visible only from an end view; the aperture extends 

 the entire length of the shell and the outer lip extends beyond the 

 vertex. 



After examining many shells in the D. minuta-hiemalis-globosa- 

 debilis-hyalina complex, it becomes obvious that they all belong to the 

 same species, for there are all types of intergrades. For example, in 

 3 specimens from Spitzbergen (labeled U. subangulatus) there is one 

 in which the apex extends beyond the aperture, one in which only the 

 tip of the apex is visible from the side, and one in which the apex is 

 invisible from the side. 



Distkibution: D. minuta is a new name for the Pacific area of the 

 Arctic, but under the name of D. globosa it has been recorded from 

 Bering Strait northward. Point Barrow is a new locality. Lemche 

 (1948) lists D. minuta from Maine to Massachusetts and the Gulf of 

 St. Lawrence; from Jan Mayen, Spitzbergen, the Murman Coast, the 

 Faroes, the Shetlands, Iceland, northern and southern Norway, 

 western Europe, the Canary Islands, and the Mediterranean. 



Family Scaphandridae 



Genus Cylichna Loven, 1846 

 Cylichna occulta (IVIighels, 1841) 



Plate 4, figure 3 



Bulla striata (not Bruguifere nor Hutton) Brown, 1827, pi. 38, fig. 41; 1844, p. 57, 



pi. 19, figs. 41, 42. 

 Bulla occulta Mighels, 1841, p. 50. — Mighels and Adams, 1842, p. 54, pi. 4, fig. 11. 

 Bulla reinhardti Moller, 1842b (ex Holb0ll, MS.), p. 79. 

 Bulla scalpta Reeve, 1855, p. 392, pi. 32, figs. 3a-c. 

 Cylichna propinqua M. Sars, 1859, p. 49. — G. Sars, 1878, p. 284, pi. 18, fig. 5; pi. 



XI, fig. 5. 

 Cylichna solitaria Friele (not C. solitaria Say), 1878, p. 225. 

 Cylichna occulta Lemche, 1948, p. 78, figs. 31-40. 



One specimen (6 mm. high by 3.5 mm. in diameter) was taken 

 through the ice on Jan. 25, 1950, at a depth of 33 feet; and one (4 by 

 2.4 mm.) was taken near shore on July 13, 1950. Both were taken 

 with a plankton net when it touched bottom. The flesh of these 

 animals was white and the shell is cream colored. 



Other material examined: About 55 specimens (including dead 

 shells) from localities ranging from Point Barrow to Kyska Harbor 

 in the Aleutians; about 35 specimens from Novaya Zemlya, Spits- 

 bergen, Norway, Scotland, and Greenland. These were labeled C. 

 reinhardti, C. striata, C. umbilicata, C. propingua, and C. scalpta. 



