THE NAUTILUS. 



VOL. XXIV. AUGUST, 191O. No. 4 



PURPURA CRISPATA AND SAXICOLA. 



BY E. G. VANATTA. 



In the following notes I follow Dr. W. H. Dall in using the 

 generic term Thais in place of the familiar name Purpura. 

 THAIS PLICATA Mart. 



The species usually called Purpura crispata from the west coast 

 of America was first named Buccinum plicatum Martyn 1789. The 

 figures in Martyn's Univ. Conchology, pi. 44, represent the large 

 foliated form, one being brown with white shoulder, and the other 

 all brown. Buccinum lamellosum Gmel. 1790, and Buccinum com- 

 positum (Chem.) Desh. 1843, were based on the same figures or 

 copies of them. Polyplex rugosus Perry 1811, is also the brown 

 form with white shoulder. Buccinum crispatum Dillw. 1817, and 

 Murex ferrugineus Esch. 1829, are entirely brown. Murex lactuca 

 Esch. 1829 (not Bolt.), is the white form of this species. 



T. p. VAR. SEPTENTRIONALIS Rve., Conch. Icon. (Purpura) III, 

 pi. 10, f. 50, is a name for the rather high spired forms without the 

 longitudinal foliation. 



THAIS LIMA Mart. 1789. 



Buccinum lima Martyn, Univ. Conch., pi. 46, has many spiral 

 costse. It lias the following synonyms: Purpura canah'culataDesb. 

 1839, Purpura attenuata Rve. 1846, Purpura decemcostata Midd. 

 1849, Purpura analoga Fbs. 1850 and Purpura beringiana Midd. 

 1851; the latter name is for specimens with the costae more spaced. 



THAIS EMARGINATA Desh. 1839. 



Purpura emarginata Desh. Rev. Zool. 1839, p. 360, Las usually 



