69 
epidermis olive; ligament external, elongated, preminent; hinge 
with an anterior and posterior series of fine sharp teeth; inter- 
jor subnacreous; pallia} sinus large and deep; anterior adductor 
_ giving off a long oblique pedal line, 
21:1080 Malletia pacifiea Dall, 1897. 
Chignik Bay, Alaska, to Monterey, Cal, 
21:1081 Malletia faba Dall, 1887. 
Queen Charlotte Islands, British Columbia, te Baja Cal, 
serps ovate, inflated shell, about 25 mm long, with a polished 
epidermis, 
21:1082 Malletia californica Dal], 
21:1088 Genus Martesia (Leach) Biainville, 1824, 
Valves lengthened behind when full-grown, by a plain bor. 
der; umbonal valves 1 or 2, dorsal and ventral marerns often with 
narrow reece od valyes; surface impressed with 1 or more fur- 
TOWS, ‘ 
Martesia xylophaga C. B. Adams, 1852, 
San Franciseo, Cal., to Panama, 
21: oes intereallata Cpr,, 1855, 276, Sheli-bering Pid- 
oe 
Farallone Islands to Catalina Igiand, Cal, Bores in large 
shells of Haliotis, its presence sometimes greatly disturbing the 
rightful owner, who often builds the so-ealled blister-pearis as a 
defense; thege blisters are eut out and get as gems in jewelry. 
This is recorded from Magdalena bay, Baja Cal,, but the 2 species 
may have been confused, and the distinguishing characters are 
not accessible te the writer at present, 
21:1085 Genus Muscuiue Bolton, 1798. 
Synonymy: Modiolaria Beck, 1846, 
21:1086 Museulus niger Gray, 1824, (924), 
Aretie Ocean to Oregon; Circumborea!, 
21:1087 Musculus impressus Dall, 1907. 
Petre] Bank, Bering Sea. 
21:1088 Museulus taylori Dall, 1897, (925), 
Vietoria, Vancouver Island. 
21:1089 Musculue laevigatus Gray, 1824. (922), 
Aretie Ocean to Puget Sound; circumboreaj. 
21:1090 Muaseulus diseors Linne, 1768. 
Aretie Ocean to Puget Sound; circumborea}. 
21:1091 Musenlus vernicogsus Middendorff, 1849. 
Bering Sea to Sitke, Alaska. 
21:1092 Musculus marmoratus Forbes 1838. (923), 
Puget Sound; cireumboreal. 
21:1093 Museulus seminudus Dali, 1897, 
Bering Sea to Forrester Island, Alaska, 
21:1094 Mercenaria periaminosa Conr., is Venus p, 
21:1095 Meretrix callosa Conr., is Amiantis c. 
21:1096 Megatebennns bimaculatus Dall, is Clipidelia b, 
