MAZATLAN UNIVALVES 477 



Hob. St. Elena, Cuming. Mazatlan ; extremely rare ; L'pool 



fy Havre Coll. 



Tablet 2230 contains one of three very small shells, contain- 

 ing 5 nuclear whirls, remarkable for two very fine spiral keels 

 and a shagreening of the surface, and (in this specimen alone) 

 for a long process from the labrum not seen afterwards. The 

 normal portion displays a sculpture which may develop into 

 P. muricata. 



Tablet 2231 contains an adult sp. with Bryozoa, &c. 



-A"" 606. PtiKPUEA BISERIALIS, Blainv. 



Blainv. Monogr. Purp. in Nouv."Ann. Mus. vol. i. p. 238, no. 75, 

 pi. 11, f. ILMke. in Zeit. f. Mai. 1850, p. 180, no. 49. 

 (Non. Hani, in Rve. Condi. Ic. pi. . sp. .) 

 =Purpura bicostalis, Rve. Conch. Ic. pi. , sp. 28. MJce. 

 loc. cit, p. 181, no. 50. P. P. (7., Cat. Prov. (Non. Blainv. 

 loc. cit. p. 238, no. 76: ? Lam. An. s. Vert. vol. x. p. 82, 

 no. 34 Non DOrb. B. M, Cat. Moll. p. 42, no. 365, [? +356 

 pars.] ) 



=Purpura undata, Vol. Rec. Obs. vol. ii. p. 315. C. B. Ad. 

 Pan. Shells, p. 80, no. 76 : non Lam. An. s. Vert. p. 67, 

 no. 10 : D'Orb. B. M. Cat. Moll. p. 42, no. 364. 

 PVar.=Purpura undata, Eyd. fy Soul. Voy. Bonite t pi. 39, 



f. 1719 : B. M. Cat. p. 24, no. 192. 



+ Purpura hsemastoma, Mice, in Zeit. f. Mai., 1847, p. 182, 

 no. 15. Comp. Buccinum hsemastoma, Linn., Syst. Nat. 

 p. 1202. 

 + Purpura consul, MJce. loc. cit. 1850, p. 180, no. 48. (Non 



Lam. loc. cit. p. 63, no. 6.) 



Comp. Purpura hsematura, Vol. Voy. Venus, pi. 8, f. 3, 3#. 

 Comp. P. Moridana, Conr. Journ. Ac. Nat. Sc. Phil. vol. vii. 

 pt. 2, 1837, p. 265, pi. 20, f. 21. = P. hamastoma, D'Orb. 

 B. M. Cat. Moll. p. 41, no. 356, (maxima pars.) 

 M. Blainville having described this shell from (young) Maz- 

 atlan specimens, brought by M. Botta, at the same time stating 

 that it represents P. hsBmastoma on the W. Coast of America, 

 "differing in its smaller size, and by its constantly having 7 

 pliciform tubercles on the labrum" (the figure however pre- 

 senting 8), there can hardly be a doubt that his species is that 

 here intended, and not the shell attributed to it by Messrs. 

 Hanley and Eeeve, which has but a remote resemblance to 

 Blainville's figure. 



