ball: 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 tlie 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 choudrophore 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. 



ITIALLETIA Desmoulins. 



Malletia Desmoulins, Actes See. Linn, de Bordeaux, Feb., 1832, 5, p. 85 ; type, 



M. ckilensis Desm. 

 Solenella Sowerby, P. Z. S. Lond., 1832 (Dec.), p. 197 ; type, S. norrisit Sowerby ; 



Conch. Man., 1839, p. 99, fig. 138. 

 Ctenoconcha Gray, Syn. Brit. Mus, 1840; ed. 1842, pp. 77, 91; Sowerby, Conch. 



Man., 1842, 2d ed., p. 128; Orbigny, Voy. Amer. Mer., Moll., 184G, p. 543. 

 Neilo A. Adams, P. Z. S. Lond., 1852, p. 92 ; type, N. cumimji Adams, /. c, p. 93, 



= Nucula australis Quoy et Gaim., Voy. Astrolabe, Zool., 1833, 8, p. 471, 



pi. 78, figs. 6-10. 



The type is from Valparaiso, Chile, in 14 to 45 fathoms, mud; Cuming. 



Malletia magellanica Mabille and RocnKBRDNE. 



Malletia magellanica Mabille et Rochebrune, Miss. Sci. du Cap Horn, MoUueques, 



1889, p. H 114, pi. 8, fig. I. 

 Malletia kyadesi Mabille et Rochebrune, op. cit., p. II 114, pi. 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 3H fathoms, sand. U. S. N. Mus. 96,233. 



Tiiis species dilfcrs from M. chilensis Desmoulins, by its smaller size, more 

 ovate form, less conspicuous marginal indentations, and a larger number of ante- 

 rior hinge teeth. The M. hi/adesi is only a somewhat larger and older specimen 

 than that figured as M. magellanica. I have no doubt of their identity. M. 

 magellanica Smith, is much more acutely pointed behind. 



Malletia inequalis Dall, n. sp. 



Shell oval, compressed, the anterior side longer, surface smooth, or showing 

 only incremental hues, covered with a thin polished brownish olive pcriostracum ; 



