DALL: MOLLUSCA AND BRACHIOPODA. 383 
end; no external ligament, lunule or escutcheon; ends subequal, the anterior 
more rounded, the posterior roundly pointed, the extremes slightly above the 
equator of the disk; surface smooth, except for lines of growth; interior white, 
dull, the scars hardly visible; margins entire and prominently arcuate basally; 
resilium strong, internal; hinge plate with about twelve anterior and fourteen pos- 
terior teeth, separated by a chondrophore large for the size of the shell. Lon. of 
shell, 8; alt. 5; diam. 3.75 mm. 
U.S. S. “ Albatross,” station 3360, Gulf of Panama, in 1672 fathoms, sand, 
bottom temperature 42° F. U.S. N. Mus. 122,909. 
MALLETIINAE. 
MALLETIA DeEsmovutins. 
Malletia Desmoulins, Actes Soc. Linn. de Bordeaux, Feb., 1832, 5, p. 85; type, 
M. chilensis Desm. 
Solenella Sowerby, P. Z. 8. Lond., 1832 (Dec.), p. 197; type, S. norrisit Sowerby ; 
Conch. Man., 1839, p. 99, fig. 188. 
Ctenoconcha Gray, Syn. Brit. Mus., 1840; ed. 1842, pp. 77, 91; Sowerby, Conch. 
Man., 1842, 2d ed., p. 128; Orbigny, Voy. Amer. Mer., Moll., 1846, p. 548. 
Neilo A. Adams, P. Z. S. Lond., 1852, p. 92; type, NV. cumingi Adams, /.c., p. 98, 
= Nucula australis Quoy et Gaim., Voy. Astrolabe, Zool., 1833, 8, p. 471, 
pl. 78, figs. 5-10. 
The type is from Valparaiso, Chile, in 14 to 45 fathoms, mud; Cuming. 
Malletia magellanica MasiLtite anp RocHEBRUNE. 
Malletia magellanica Mabille et Rochebrune, Miss. Sci. du Cap Horn, Mollusques, 
1889, p. H 114, pl. 8, fig. 1. 
Malletia hyadesi Mabille et Rochebrune, op. cit., p. H 114, pl. 7, fig. 8. 
Punta Arenas, Magellan Strait, Hyades. U.S. S. “ Albatross,” station 2779, 
Straits of Magellan, in 77 fathoms, ooze, bottom temperature 47° F. Also at 
station 2780, in 369 fathoms, mud, temperature 47°, and 2772, off Cape Virgins, 
in 31} fathoms, sand. U.S. N. Mus. 96,238. 
This species differs from I. chilensis Desmoulins, by its smaller size, more 
ovate form, less conspicuous marginal indentations, and a larger number of ante- 
rior hinge teeth. The WM. hyadesi is only a somewhat larger and older specimen 
than that figured as M. magellanica. I have no doubt of their identity. J. 
magellanica Smith, is much more acutely pointed behind. 
Malletia inequalis DaLt, n. sp. 
Shell oval, compressed, the anterior side longer, surface smooth, or showing 
only incremental lines, covered with a thin polished brownish olive periostracum ; 
