MAEINE MOLLUSKS — MACGINITIE 81 



mens from the eastern Pacific (from Icy Cape through Bering Strait 

 to the Pribilofs and Aleutians) . 



Discussion: In some of the specimens the base of the last whorl 

 is convex and in others it is nearly flat. The base may have visible 

 spiral striae or may be smoooth (pi. 2, fig. 11). The axial cords (pi. 

 1, fig. 9) are prominent in some and faint in others, especially in the 

 last whorl. Sometimes these cords evanesce at the periphery and 

 appear again on the base. There is great variation in the strength 

 of the revolving cord or cords. In the adult specimen from Point 

 Barrow there are two spiral cords on the whorls. The color is whitish 

 gray. Several specimens from Maine have a rosy cast. 



Distribution: Parry Islands (Thorson, 1944), Labrador to Rhode 

 Island, Greenland, Iceland, Jan Mayen, Spitzbergen, northern and 

 southern Norway, Russia; Point Barrow to the Aleutians. Point 

 Barrow is a new locality. 



Family Liotiidae 



Genus Molleria Jeflfreys, 1865 

 Molleria costulata (Mollcr, 1842) 



Plate 3, figures 2-5 



Margarita costulata Moller, 1842a, p. 10; 1842b, p. 81. 



Molleria costulata G. Sars, 1878, pp. 127, 343, pi. 9, figs. 8a-c. — Odhner, 1912, 

 pp. 19, 75, pi. 5, figs. 43-47. 



Six living specimens were di"edged: 3 at 453 feet, 1 at 477 feet, 

 and 2 at 741 feet. The larger specimen from 741 feet had 2 fora- 

 minifers on it, one of them completely filling and covering the umbilical 

 opening. 



Other material examined: About 30 specimens from such 

 localities as the Shetlands, Ireland, Spitzbergen, Sweden, Norway, 

 Iceland, Greenland, and Newfoundland. 



Discussion: This species is highly variable. To give some idea 

 of this variation, the specimens from Point Barrow have been divided 

 into three general forms: 



Form 1. One specimen of about 2.75 whorls from 477 feet (pi. 3, 

 fig. 4) and another of about 2.50 whorls from 453 feet (pi. 3, fig. 3). 

 In both the nucleus is intact. The smaller is light tan in color, the 

 larger dark tan to light brown. The axial sculpturing consists almost 

 entirely of incremental lines. In each shell a beaded spiral cord 

 outlines the umbilicus and terminates at the summit of the peritreme. 

 In the larger, three other spiral cords disappear into the umbilicus and 

 in the smaller there are two and the beginning of a third. In both 

 specimens, just posterior to the outer spiral cord there are the begin- 

 nings of axial cords separated by shallow oval depressions. These 



