THE NAUTILUS. 117 



SOME VARIETIES OF WESTERN OLIVELLAS. 



BY T. S. OLDROYD. 



Conrad described Olivella pedroana from a fossil found at San 

 Pedro, in 1854, but the figure is more like what Carpenter de- 

 scribed as 0. intorta ; this is plentiful in the Upper San Pedro, 

 and not at all like 0. boetica Cpr., described by him in the re- 

 port of the British Association for Advancement of Science, 

 published in London in 1864. The following is Carpenter's 

 description, not a very full one, 0. boetica, narrow, dull, thin. 

 This has erroneously been called anazora, tergina, petiolata and 

 rufifasdata. Habitat between San Diego and San Pedro, Santa 

 Barbara, Monterey, Oregon, the region on each side of the 

 Columbia River, Puget Sound and Vancouver Island. Type 

 locality not given. Sowerby in Thesaurus Conchyliorum, Vol. 

 4, gives the type locality as British Columbia. They are quite 

 plentiful at Departure Bay, Vancouver Island, but most of 

 them are a reddish brown in color; they are also found in Puget 

 Sound and all along the coast of British Columbia, and Alaska 

 up in the Bering Sea. All of the northern 0. boetica are much 

 the same in shape but in the farther north they grow larger and 

 more beautifully striped, a creamy white with zigzag markings 

 of brown, these have also been found in Puget Sound, and it 

 would be more practicable to call the northern specimens all 

 the same. The 0. boetica in the region between San Pedro and 

 San Diego vary from those in the north, both in color and 

 shape; in fact, though it is not generally known, there are two 

 distinct varieties in this region, different in size and shape, the 

 smaller of the two which I will describe is also found in lower 

 California, living, and is very plentiful in the upper Pleistocene 

 at San Pedro. 



Olivella biplicata Sowerby was described in the Tankerville 

 Catalogue in 1825. The type locality is Monterey; it is also 

 found further south in San Luis Obispo County. Although 

 they vary somewhat in shape of spire yet they are easily dis- 

 tinguished, being thicker, broader, and with a much larger 

 callus spot than the San Pedro variety. Those found in the 



