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DALL: MOLLUSCA AND BRACHIOPODA. 409 
Lima martiali Mabille et Rochebrune, Miss. du Cap Horn, Moll., 1889, p. H.124; 
Orange Harbor. 
Lina (Limatula) pygmaea Smith, Chall. Rep., Lamell., 1885, p. 292. 
US NM, t Albatross,” station 9777, Magellan Straits, in 20 fathoms, gravel ; 
U. 8. N. Mus. 96,192; also at station 2778, in 61 fathoms, bottom temperature 
Al 9 Y, Kerguelen Island, Smith; South Orkneys, Scottish Antarctic 
Expedition ? 
From the material available it seems that there are two species of Limatula in 
the Magellanic region, one of which was described as above indicated, by Philippi, 
as having smooth radial ribs and the submargins without radial sculpture. 
One form, which I identify as pygmaea, has the smooth submargins large, and 
extending nearly to the ventral border, without any radial sculpture upon them 
Whatever, and with the concentric sculpture of the disk confined to incremental 
mes. The number of ribs visible at the ventral margin does not exceed fifteen. 
In neither of the species is there any medial sulcus. The very young show a dis- 
tinct though minute taxodont provinculum, but the adult does not show the 
unge denticulations of Zimaea; although the general form and sculpture recalls 
Limaea rather than the Limatula of the Northern hemisphere. 
Lima (Limatula) falklandica A. Apams. 
p matula falklandica A. Adams, P. Z. S. Lond., 1863, p. 509. 
tma (Limatula) hodgsoni E. A. Smith, Nat. Antarct. Exp., Nat. Hist., 1907, 2, 
Moll. p. 6, pl. 3, fig. 8. 
in - Albatross,” station 2781, off the coast of Southern Chile, or West- 
M gonia, in 348 fathoms, mud, bottom temperature 499.9 F. U. S. N. 
NS Also ee ho 2784, and 2787, in 61 to 194 fathoms, mud, 
itis: an 48 s 54 E Falkland Islands, A. Adams; South Orkneys, 
4, 181 Antaretio Expedition. 
L poem ot which a good many specimens were collected, differs from 
levine Me nn by having short and very small, smooth submargins, and in 
Dx dr ribs smaller, much more numerous, and obscurely divided into 
pem $ i E. median with about fifteen strong ribs ; an anterior with about 
de, Ln = y much smaller ribs; and a posterior with about fourteen similar 
Seal Jen kj becoming obscure. All these ribs are elegantly sculptured by 
im E regularly spaced lamellae, which in crossing the ribs rise to 
lg. 8h) z scales exactly as figured by Smith for L. hodgsoni, as above cited 
- In some cases the scales are closer than in others, but this seemed the 
on] s urn $ 3 Ap ‘ i 
Wi en variation. I am not sure that Z. hodysoni is specifically identical 
zn 
tl 
e (S repe sii the former is more than twice as large as the latter, but 
Bi insi M of the former given by Smith seems identieal in every other 
oka h our shells. I separate Jolklandica from pgymaea + martiali, because 
en mentions the concentric sculpture, while Philippi and Mabille 
shells to have “smooth ” ribs. 
