302 Bidletin Vanderbilt Marine Museum, Vol. VII 



References: Siphonaria gigas, Sowerby, G. B., Sr., in Ben- 

 net, C, Fourth Earl of Tankerville's Cat. Mollusca, Appen- 

 dix, 1825, p. 6.— Reeve, L., Conch. Icon., 1856, vol. IX, 

 Siphonaria, pi. 1, fig. 3, March, 1856.— Dall, W. H., Proc. 

 U. S. Nat. Mus., 1910, vol. XXXVII, pp. 205, 290. 



Siphonaria characteristica, Reeve, L., Conch. Syst., 1842, vol. II, 

 pi. 138, fig. 3; Conch. Icon., 1856, vol. IX, pi. 2, fig. 8, of 

 Siphonaria. 



Superfamily: DOCOGLOSSA 



Family: PATELUDAE 

 Subfamily: Naeellinae Thiele 



Genus: NACELLA Schumacher 



Section: PATINIGERA Dall 



Nacella aenea Martyn variety magellanica Gmelin 



Plate 116 



Type: This species was first described by Thomas Martyn, 

 in 1784, from shells collected in the Straits of Magellan and de- 

 posited in his cabinet. The variety magellanica was established 

 by Gmelin on specimens from the Straits of Magellan, who also 

 described a variation of magellanica under the name areolata, 

 now regarded as merely a synonym. His types are deposited at 

 Upsala. 



Various forms of the variety magellanica have been described 

 under different names, i. e., Patella atramentosa, P. venosa and 

 P. chiloensis by Lovell Reeve, whose types are deposited in the 

 British Museum, and Patella meridionalis , P. metallica, P. pupil- 

 lata and P. tincta by M. Rochebrune and Mabille from shells col- 

 lected by the French government's Mission Scientifique du Cap 

 Horn, 1882-83, and deposited in the Paris Museum. 



Material examined : Eighteen specimens taken on the shores 

 of Clotilde Island, Chiloe Archipelago, Chile, February 12, 1935. 



Distribution : This species and its variety are known from 

 the littoral zone of the Magellanic Province. 



Technical description: One of the largest shells in the 

 present series has a long diameter of 50 millimeters, a short di- 

 ameter of 40 millimeters and an altitude of 6 millimeters, while 



