DALL: MOLLUSCA AND BKACHIOPODA. 313 



I»IUREX LiNNE. 



Murex (Alipurpura) centrifuga Hinds. 



Murex centrifuya Hinds, Zool. Voy. Sulphur, Moll., 1844, p. 8, pi. 3. figs. 7, 8. 



West coast of Veragua in fifty -two fathoms, saud, Hinds ; U. S. S. " Albatross," 

 station 3391, Gulf of Panama, in 153 fathoms, mud, bottom temperature 53°. 8 F. 

 U. S. N. Mus. 123,019. 



Tlie 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 Broderip. 



Murex humilis Broderip, P. Z. 8. Lonil., 1832, p. 17G ; Reeve, Conch. Icon., 1845, 

 3, Murex, pi. 13, fig. 50 b. 



St. Elena, west coast of Nicaragua, Cuming; U. S. S. "Albatross," station 

 2798, in Panama Bay, in 18 fathoms, sand. U. S. N. Mus. 110,615. Also ou 

 the beach of Pcrico Island, Panama Bay. 



Tritonalia Fleming. 



Tritonalia Fleming, Hist. Brit. An., 1828, p. 5G7 (in corrigenda) ; type, yfurex 



erinacens Linne. 

 Ocenebra (Leach MS.) Gray, Ann. Mag. N. Hist., 1847, 20, p. 209; Gray, P. Z. S. 



Lond., 1847, p. 133 No. 10; same type. 

 Ocinebra H. and A. Adams, Gen. Kec. Moll., 1853, 1, p. 74 ; Fischer, Man. de 



Conchyl., 1883, p. 042. 



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 Dall, n. ep. 



Plate 12, figures 4, 5. 



Shell small, reddish brown with (on the last whorl four, on the antepenultimate 

 whorl five) spiuuse varices and about seven whorls, of which nearly three are 

 nuclear and defective ; spire subtabulatc 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 laniellose, posteriorly 

 imbricately longitudinally laterally threaded, recurved spine; ou 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, iu front of 



