ß4 Art. 6. — M. Ydkoyama : 



Fossil occurrence. — Yokosuka Zone (Yokosuka and Otsn). 

 Living. — Northern, Central and Western Japan, East coast of 

 Africa. 



57. Purpura alveolata, Keeve. 

 Pl. III. Fig. 10. 



Purpura alveolatj. Reeve, Conch. Icon., vol. Ill, spec. 60, pl. XI, fig. 60. Dunkkr, Index 

 Moll. Mar. Jap., p. 40. Pilsbry, Catal. Mar. Moll. Japan, p. 44. 



Purpura clavigera. Küster in Syst. Conen. Cab. Mart. u. Chemn., vol. Ill, pt. 1, p. 186, pl, 

 31 a, fig. 1. Lischke, Jap. Meeresconch., vol. I, p. 54, pl. V, figs. 12-14. 



Purpura lumulosa. Lischke, Jap. Meeresconch., vol. I, p. 56. pl. V, figs. 15, 16. 



Two young specimens partly broken, but agreeing with those 

 figured by Lischke as Purpura clavigera and Purpura, tumulosa, 

 which surely are mere synomyms of Purpura alveolata Reeve. 

 Tryon considers this latter species as a variety of Purpura 

 hippocasianeùm- Lam. (Man. Conch., II, p. 162), an opinion 

 which I am not at all against, for this group of Purpura as above 

 stated is vary variable in form. 



Fossil occurrence. — Yokosuka Zone (Yokosuka); Naganuma 

 Zone (Naganuma). 



Living. — Central and Western Japan, Chile, Panama. 



Family Tritonidae. 



Genus Triton* Montfort. 



58. Triton (Priene) oregonensis, Redfield. 



Pl. III. Figs. 19, 20. 



Triton oregonensis. Redfield, Ann. Lye. Nat. Hist. New-York, 1846, vol. 4, p. 165, pl. XI, 

 Fig. 2 ab. Lischke, Jap. Meeresconch., vol. Ill, p. 31. Küster in Syst. Conch. Cab. Mart. u. 

 Chemn., p. 247, pl. 66 : fig. 2. Dünker, Index Moll., p. 30. 



Tr tonium cancellatum. Middendorff, Mai. Ross. II, p. 164, pl. HI, figs. 1, 2. Schrenck, 

 Nordjap. Moll., p. 431. 



Tritonium oregonense. von Mariens, Mal. Blätter., XIX, 1872, p. 30. H. and A. Adams, 

 Genera, vol. I, p. 104. 



Priene oregonensis. A. Adams in Journ. Proe. Linn. Soc, 1864, vol. VII p. 106. Pilsbry, 

 Cat. Mar. Moll. Japan, p. 47. 



There are numerous specimens of this beautiful species, but 

 not a single large one in perfect preservation. It is easily 

 recognized by its broadly fusiform shape, rounded whorls, many 



