DALL: MOLLUSCA AND BRACHIOPODA. 313 
MUREX Linne. 
Murex (Alipurpura) centrifuga Hinps. 
Murer centrifuga Hinds, Zool. Voy. Sulphur, Moll., 1844, p. 8, pl. 3. figs. 7, 8. 
West coast of Veragua in fifty-two fathoms, sand, Hinds; U. S.S. “ Albatross,” 
station 3391, Gulf of Panama, in 153 fathoms, mud, bottom temperature 55°.8 F. 
U.S. N. Mus. 123,019. 
The operculum is concentric with the nucleus a little above and to the right of 
the apex. It has no Purpuroid markings on the reverse side. 
Murex (Phyllonotus) humilis Broperrir. 
Murex humilis Broderip, P. Z. S. Lond., 1832, p. 176; Reeve, Conch. Icon., 1845, 
3, Murex, pl. 13, fig. 50 b. 
St. Elena, west coast of Nicaragua, Cuming; U. 8. S. “ Albatross,” station 
2798, in Panama Bay, in 18 fathoms, sand. U.S. N. Mus. 110,615. Also on 
the beach of Perico Island, Panama Bay. 
Tritonalia FLEMING. 
Tritonalia Fleming, Hist. Brit. An., 1828, p. 567 (in corrigenda) ; type, Murer 
erinaceus Linné. 
Ocenebra (Leach MS.) Gray, Ann. Mag. N. Hist., 1847, 20, p. 269; Gray, P. Z. S. 
Lond., 1847, p. 183 No. 10; same type. | 
Ocinebru H. and A. Adams, Gen. Rec. Moll., 1853, 1, p. 74; Fischer, Man. de 
Conchyl., 1883, p. 642. 
It is somewhat surprising that, notwithstanding the above names and dates 
have been frequently cited, Fleming’s name, twenty years prior to the publica- 
tion of Leach, has been ignored. 
Murex (Tritonalia) diomedaeus Da tt, n. sp. 
Plate 12, figures 4, 5. 
Shell small, reddish brown with (on the last whorl four, on the antepenultimate 
whorl five) spinose varices and about seven whorls, of which nearly three are 
nuclear and defective; spire subtabulate with two strong, rounded revolving 
ridges, the posterior larger and forming the shoulder, and at the varices forming 
a long, anteriorly guttered and longitudinally anteriorly lamellose, posteriorly 
imbricately longitudinally laterally threaded, recurved spine; on the body be- 
tween varices there are three or four other similar ridges, smooth, except for 
very fine revolving striae, and ending in similar but shorter spines, in front of 
