306 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Mopalia muscosa swanii Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 648. 
Red, ridge arched; less sculptured. (Carpenter.) 
Type in United States National Museum. Type locality, Tatooche 
Island. 
Range. Shumagin Islands, Alaska to Monterey, California. 
Described as Mopalia kennerleyi var. swanii Carpenter. 
Mopalia muscosa kennerlyi Carpenter, 1864 
Supplementary Report, British Association for the Advancement of Science, 648. 
Proceedings, Philadelphia Academy of Natural Sciences, 59:1865. 
Grayi, antea, p. 603, nom. preoc. Sculpture fainter: olive with red: 
ridge angular; post, valve waved. (Carpenter.) 
M. t. M. muscosa forma, indole, sculpturaque simili; sed multo magis 
elevata; plus minusve rubente, plus minusve olivaceo variegata, intus pal¬ 
lida ; granis lateralibus fere aequalibus; liris centralibus haud acutis, inter- 
stitiis rarius cancellatis; suturis undatis, apicibus valvarum prominentibus; 
valva antica octoradiata, radiis granulosis, margine octies inciso; valvis in- 
termediis utraque semel incisis; valva postica mucrone obsoleto, sinu postico 
alto, angustiore, marginibus anticis valde alatis, lateribus posticis semel 
incisis. (Carpenter.) 
Shell like M. muscosa in form, character, and sculpture; but much 
more strongly elevated; more or less reddish; more or less mottled with 
olive, within pale; with lateral grains nearly equal; with central lirae not 
acute; with interstices more rarely cancellate; with wavy sutures, with 
apices of the leaves prominent; with anterior shell octo-radiate, with granu¬ 
lar radii, with the margin eight times incised; with the intermediate leaves 
incised once on both sides; posterior leaf with obsolete edge; with deep 
narrow posterior sinus, with anterior margins strongly winged, with hinder 
sides incised once. (Translation.) 
Type in ? Type locality, Puget Sound ? 
Range. Shumagin Islands, Alaska, to Monterey, California. 
Mopalia muscosa acuta Carpenter, 1855 
Proceedings, Zoological Society of London, 232. Tryon and Pilsbry, Manual of Con - 
chology, 14:297; PI. 64, figs. 75-81. 
C. t. ovata, valde elevata (ad angulum 105°), tenui; olivacea, interdum 
maculis tenebrosioibus; lineis diagonalibus vix monstrantibus; areis latera- 
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