METHODS OF STUDY. 



19 



the mollusks which you may find, it has seemed best 

 to essentially follow the order adopted by Dr. P. P. 

 Carpenter, in his report on ' ' The ]\Iollusks of Western 

 North America." 



Many very small shells will be but briefly described, 

 and where there are several varieties of the same 

 species, the principal ones only will be noticed. Still, 

 I trust that every shell which ordinar}^ collectors will 

 be likely to gather upon this coast may be identified 

 by the engravings or the descriptions. 



Sometimes the same species has received several 

 distinct names, given by men who were not aware 

 that it had been named before, or who have named 

 two or more varieties of the same species. 



In such cases, I have endeavored to give the most 

 approved name, sometimes referring to the others as 

 synonyms. For the study of such perplexing points, I 

 would refer my readers to the larger books and to the 

 reports of learned societies. 



Chrysodorniis liratiis^ Mart., li-ra^-tus, is a species 

 from Alaska, having a fusiform shell three inches 

 long, brown in color, and marked by a few sharp spiral 

 ridges, especially prominent on the body whorl. 



Anachis penicillata^ Cpr., An^-a-kis pen-i-sil-la^-ta, 

 has a minute, slender, brownish shell, consisting of 

 six finely-ridged and sculptured whorls. Its length 

 is only one-fourth of an inch. This, and the next 

 species, y4;/<^<;///^ siibhirrita^ Cpr., sub-tur'-ri-ta, which 

 is smaller and has fainter ribs, are both found in 

 southern waters, that is, from the region of Santa 

 Barbara to the coast of Mexico. 



By the term ribs, I would indicate little ridges 

 which run across the spiral lines. The word is used 



