Fossils from the Mi ura Peninsula ami its Immediate North. «-5 



(diameter) varying, 10:3,2-4,1. The largest specimen measures 

 a 1 >out 45 millim. in height. 



This is a very variable species, some specimens being much 

 more slender than others. Also the number of varices on the 

 body- whorl varies from four to eight. Also the spiral threads are 

 sometimes so indistinct as hardly to be visible, while in others 

 they are unusually distinct. The length of the canal is also not 

 constant. All these variations can be observed in hundreds of 

 specimens found at Koshiba. 



Sowerby in describing this species had an example with six 

 varices. 



Fossil occurrence. — Yokosuka Zone (Yokosuka); Kanazawa 

 Zone (Kanazawa); Koshiba Zone (Koshiba). 



Living. — Japan (Sowerby). This species seems to be rare at 

 present, for I have never seen it in our conchological collections. 



Genus Purpura. Brugujère. 



56. Purpura luteostoma, (Chemnitz). 



Pl. III. Fig. 27. 



Purpura luteostoma. Küster in Syst. Conch. Cab. Mart. u. Chemn., vol. HE, pt. 1, p. 107. 

 Lischke, Jap. Meeresconch., I, p. 54, II, p. 39. Pilsbrt, Cat. Mar. Moll. Jap., p. 44. 



Purpura bronni. Ddnker, Moll. Jap., p. 5, pl. I, fig. 23. Lischke, Jap. Meeresconch., I, p. 

 53, pl. V, fig. 17, II, 39, pl. IV, fig. 20. 



Jfrtccinum luteoslomum. Chemnitz, Conch. Cab. 11, p. 83, pl. 187, fig. 1800, 1801. 



Two broken specimens which, however, exactly agree with 

 those figured by Dunker and Lischke as Purpura bronni. This 

 Purpura bronni is, according to Tryon (Man. Conch., II, p. 163,) 

 identical with Purpura tumulosa Reeve, while Pilsbry (Cat. p. 

 44) unites it with Purpura alveolala Reeve which he says is 

 synonymous with Purpura clavigera Küst., and Purpura tumulosa 

 Lischke. From this we see that there is a great deal of confusion 

 among the Japanese Purpurae of this group. And this, I am 

 sure, arises from the fact that these so-called different species pass 

 insensibly into one another. But in the systematic conchology 

 we must draw a line of demarcation somewhere; therefore follow- 

 ing Pilsbry, I include Purpura bronni among Purpura luteostoma 

 and treat it as a separate species from the following one. 



