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 O. intorta; this is plentiful in the Upper San Pedro, 
and not at all like O. 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, O. boetica, narrow, dull, thin. 
This has erroneously been called anazora, tergina, petiolata and 
rufifasciata. 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 O. 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 O. 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 
