570 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 49. 



The first two figures named in the above synonymy have a re- 

 markable likeness to some smooth varieties of the present species. 

 Tryon refers the first to P. scohina Quoy, from New Zealand and the 

 Cape of Good Hope, but some of his other combinations are not so 

 happy that they lead to much reliance on his opinion in this case. 



The name emarginata is founded on a pathological feature of the 

 type specimen, yet it is not obnoxious enough to make it necessary 

 to reject it solely on that account. How Carpenter came to identify 

 this species with saxicola of Valenciennes is a puzzle; the original 

 figure of the latter is clearly a form of Thais lima, exactly duplicated 

 by many specimens from the Northwest in our collection. The 

 reference of saxicola to T. freycinetii is more reasonable, as the 

 relations between that species and T. lima are very close, if indeed 

 freycinetii is more than a subspecies of T. lima. 



The original locality, as for many west coast shells, is given as 

 "New Zealand." As this is erroneous, I name San Miguel Island, 

 California, where the typical form is abundant, as the type locality. 



THAIS EMARGINATA, typical form. 



Shell thick, solid, rotund, with a short spire of about three whorls 

 without the nucleus, the body rude, with coarse nodulous or sub- 

 spinose major spirals, a more or less flaring thickened outer lip, a 

 very arcuate flattened pillar, short and hardly recurved canal, and 

 sealed umbihcal concavity (220975). 



Measurements. 



THAIS EMARGINATA, var. OSTRINA Gould. 



Tillamook, Oregon. 



Shell thinner than the preceding, nearly smooth, the major spirals 

 represented by interrupted bands of dark-brown color but not raised 

 above the general surface, and generally with a more elevated spire 



(32176). 



Measurements. 



Whorls. 



3i 



^ 

 ^ 



Height 

 of shell. 



Height 

 of last 

 whorl. 



Height 

 of aper- 

 ture. 



Breadth. 



