DALL | REVIEW OF AMERICAN VOLUTID&. 361 
nepionic stage, less than two inches long, and, from the figures, are 
probably referable to this species. 
Specimens were collected by the U. S. Exploring Expedition under 
Wilkes near the mouth of the Rio Negro, Argentina, and by the 
U. S. steamer Hassler in the Straits of Magellan. 
U. S. Nat. Mus., 7484 and 98,461. 
This species seems nearest related to brasiliana and Becki, but has 
been regarded as sufficiently distinct by several good authorities. 
Reeve unites it with swbnodosa under the name of magellanica, but 
it is not the magellanica of Lamarck, who was the first to differ- 
entiate that species. In the absence of a connecting series I prefer 
to let the species stand as distinct. According to Lahille it has 
from three to five plaits and may reach a length of nearly six inches, 
with a diameter of nearly four inches. Strebel unites the variety 
pseudofusiformis Lahille with magellanica (Strebel), and queries if 
the species is not identical with fusiformts Kiener. 
ADELOMELON BRASILIANA Solander 
Voluta brasiliana SoLANDER, Portland Cat., p. 186, no. 3958, 1786. 
Voluta colocynthis Brasiliana Solandri Curemwnitrz, Conch. Cab., XI, p. 
10, pl. 176, figs. 1695, 1696; 1705. 
Voluta colocynthis Dittwyn, Cat. Rec. Shells, 1, p. 574, 1817, LAHILLE, 
Rey. Mus. de la Plata, v1, p. 307 (extras, p. 10, 1895; with varieties: 
lactea; intermedia; globosa (not V. globosa Dittwyn, Cat. Rec. 
Shells, p. 569, 1817); depressa (not V. depressa LAMARcK, Ann. du 
Mus., Paris, 1, p. 479, 1802); pseudomagellanica; carinata (not V. 
carinata ZEKELI, 1852); subcarinata; alternata; and spirabilts. 
Voluta brasiliana D’OrsicNy, Voy. Am. Mér., v, p. 424, pl. Lx, figs. 4-6, 
1841; Krener, Icon. Rec. Shells, Voluta, p. 31, pl. xxx, 1839; 
Sowersy, Thes. Conch., p. 204, no. 28, pl. Liv, fig. 98, 1847; REEVE, 
Conch. Icon., Voluta, pl. xv, fig. 34, 1849; Tryon, Man., tv, p. 98, pl. 
29, figs. 113, 115 (only), 1882. 
Voluta (Cymbiola) brasiliana Crosst, Journ. de Conchyl., xix, p. 300, 
1871; STREBEL, Zool. Jahrb., xxiv, heft 2, p. 92, 1906. 
Habitat.—Shores of eastern South America from Rio Grande do 
Sul, Brazil, to the mouth of the La Plata and south to the Rio Negro 
in Patagonia. Maldonado Bay, Uruguay; young, in 10 fathoms; 
Pwsand:. 
U.S. Nat. Mus., 185,362, 97,044, 9731 and 171,430. 
This well marked species has been known for a century, but it 
is extremely rare to find it in good condition. The typical form 
reaches a length of nearly seven inches, with a width of five and 
one fifth inches, usually with two plaits above which may be several 
obscure ridges. The largest forms, which are called globosa by 
