MARINE MOLLUSKS — MACGINITIE 75 



the props and the triangular depressions at the sides of the septum 

 (see pi. 4, fig. 2); they lack the calloused ridges, the groove is less 

 pronounced, and there are no rows of chalky-white marks. 



Distribution: In the eastern Atlantic from Franz Josef Land, in 

 the Arctic Ocean south to Scotland and northern England and on the 

 continent along the coast of Norway south to Spain. In the western 

 Atlantic from Greenland and the Melville Peninsula, and from Hudson 

 Bay south to Cape Cod (Farfante, 1947). Magellan Strait, Patagonia, 

 and the Falkland Islands (Odhner, 1912).* In the eastern Pacific from 

 Point Barrow, the Aleutians, the Shumagins, and south of Juneau. 

 This species is new to Arctic Alaska. 



Family Trochidae 



Genus Margarites Gray, 1847 

 Margarites costalis (Gould, 1841, ex Loven MS) 



Varieties 

 Plate 1, figures 1-7 



Margarita striata Broderip and Sowerby (not Leach, 1819), 1829, p. 371. 



Turbo cineretis Couthouy (not Born, 1778), 1838, p. 99, pi. 3, fig. 9. 



Margarita cinerea Gould, 1841, p. 252.— Odhner, 1912, pp. 17, 62, pi. 4, figs. 28-37; 



pi. 5, figs. 1-5. 

 Trochus costalis Gould (ex Lov^n MS), 1841, p. 252. 

 Turbo corneus Kiener (not Linnaeus, 1758), 1847-1848, pi. 19, fig. 2 [text in 1873. 



by P. Fischer, vol. 22, p. 129]. 

 Margarita sordida Hancock, 1846, p. 324 [as substitute for M. striata Broderip and 



Sowerby]. 

 Margarita cinerea var. grandis Morch, 1869, p. 19. — Odhner, 1912, p. 17, pi. 4, 



figs. 34-36. 

 Margarita cinerea var. grandis forma multilirata Odhner,* 1912, pp. 65-67, pi. 4, 



fig. 33; pi. 5, figs. 1, 2. 

 Margarites sordida Dall, 1921, p. 178, pi. 17, figs. 11, 12. 

 Margarites costalis Rehder, 1937, p. 115. 

 Margarites cinerea Morris, 1951, p. 114, pi. 26, fig. 5. 



At least 100 specimens — the majority of which were hving — of 

 varieties of this species were taken from 16 stations at depths ranging 



• In a personal communication Dr. Odhner informs me that he made no personal examination of specimens 

 from these regions but that they were reported by Strebel in 1907 and 1908 and that his specimens are stored 

 to the Riksmuseum. The division of mollusks of the U. S. National Museum sent me lor examination 

 several specimens from the above regions that had been described under the names of Rimula coriea 

 d'Orbigny and Puncturclla falklandica A. Adams and later had been assigned to P. noachina by one con- 

 chologist. The type of R. coriea, from Cape Horn, and another specimen from the west coast of Patagonia 

 are definitely not P. noacMna.. P. coTica has a different apex, the shell is higher and thinner and the apical 

 slit is widest at a different point; there are no props and the calloused ridges are lacking. P. falklandica 

 bears more resemblance to P. noachina, but in at least five specimens from western Patagonia the props 

 are lacking and the septum is shorter than in P. noachina. Further study will be necessary to determine 

 whether or not a few specimens from Magellan Strait actually are P. noachina. 



* Odhner (1912) generously ascribes forma multilirata to MSrch (1869), but Morch did not use "multilirata" 

 as the name of a form, he merely used the word in describing some of the variations of the var. grandin. 

 Consequently, the word had no standing as forma mullilirata until Odhner described and illustrated it 

 in 19)2. 



473771—59 2 



