Calif ornica Pfr, tbe latter having an almost smooth surface. Specimens of T. 

 Stimpson'd are in the cabinets of Messrs. Henry Hemphill, W. G. Binney, and 

 Thomas Bland, the Philadelphia' Academy of Natural Sciences and my own. 



[From the Proceedings of the California Academy of Sciences, August 19, 1872 .] 



Notes on Purpura eanalieulata, of Duelos. 



BY ROBERT E. C. STEARNS. 



This fine species ranges from Unalashka, south to Monterey, California — 

 most of the specimens heretofore distributed being from the intermediate point 

 of Vancouver Island, Specimens from the last named place, large numbers of 

 which I have examined, are less variable in size and form than those from far- 

 ther north, and are generally a more delicate shell. One marked peculiarity of 

 the Vancouver specimens is the wide groove or sulcation following the suture, 

 which appears to be constant, as I have found it in all the specimens from this 

 locality ; it is infrequent in the more northern and southern specimens. The 

 Vancouver shells average l^g inches in length, and the costa? are very promi- 

 nent. The specimens from Unalashka are the largest I have seen, the average 

 length of a large number (60) reaching \% inches, and a few specimens meas- 

 uring \% inch. A variety from Sitka is of a dingy yellow color, (adults) in- 

 ternally of a brownish yellow, sometimes running into a dark reddish brown ; 

 occasionally a banded variety is met with at all of the localities. The shells of 

 this species are generally prolonged anteriorly, which gives a somewhat acute 

 V-shape to that part of the mouth. 



Comparing the specimens, from Unalashka to Monterey, including intermedi- 

 ate places, it will be seen that they vary greatly in size, color and general out- 

 line, as do the other species of Purpurida^ found within the same limits. The 

 general variation from the Vancouver form is in the much larger and ventricose 

 body-whorl, 



