NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 16 



Genus YOLDIA Moller, 1842. 



Section MEGAYOLDIA Verrill, 1897. 



YOLDIA THRACIAEFORM1S Storer, 1838. 



Boston Journ. Nat. Hist., vol. 2. p. 122.— Godxd, Inv. Mass., p. 97, fig. 66. 

 Arctic Ocean to Oregon. Also Atlantic. 



YOLDIA SECUNDA Da", 1916. 



Proc. U. S. Nat. Mus., vol. 52, No. 21S3, p. 398. 

 Southeastern Alaska, in deep water. 



YOLDIA BERINGIANA Dall, 1916. 



Proc. U. S. Nat. Mus., vol. 52, No. 2183, p. 399. 

 Bering Sea to Anacapa Island, California. 



YOLDIA MONTEREYENSIS Dall, 1893. 



Nautilus, vol. 7, No. 3, p. 29; Bull. Nat. Hist. Soc. Brit. Col., No. 2, p. 9, pi. 



2, tig. 16. 

 Chirikoff Island, Alaska, to San Diego, California. 



YOLDIA MARTYRIA Dall, 1897. 



Bull. Nat. Hist. Soc. Brit. Col., No. 2, p. 9, pi. 2, fig. 15. 

 Kasaiin Bay, Alaska, to Gulf of California. 



YOLDIA VANCOUVERENSIS, Smith, 1880. 



Ann. Mag. Nat. Hist., ser. 5, vol. 6, No. 34, p. 28!>. 

 Vancouver Island (Smith). 



Section YOLDIA. s. s. 



YOLDIA MYALIS Couthouy, 1838. 



Boston Journ. Nat. Hist., vol. 2, p. 62, pi. 3, fig. 7. 

 Arctic Ocean to Puget Sound. Also Atlantic. 



YOLDIA COOPERI Gabb, 1865. 



Proc. Cal. Acad. Sci., vol. 3, p. 1S9; Pal. California, vol. 2, pi. U\ fig. 54. 

 San Francisco Bay to San Diego, California. 



YOLDIA LIMATULA Say, 1831. 



Anier. Conch., pi. 12. — Han ley, Mon. Nuculidae, pi. 1, fig. 9. 

 Arctic Ocean to San Diego. Also Atlantic. 



Section CNESTERITJM Dall, 1898. 



YOLDIA SCISSURATA Dall, 1898. 



Trans. Wagner Inst., vol. 3, pt. 4, p. 595. 

 Arctic Ocean to Gulf of Georgia. 



YOLDIA SEMINUDA Dall, 1871. 



Anier. Journ. Conch., vol. 7, p. 153; Bull. Nat. Hist. Soc. Brit. Coll, No. 2. 



p. S. 

 Okhotsk and Bering Seas to Sitka, Alaska. 



YOLDIA ENSIFERA Dall, 1897. 



Bull. Nat. Hist. Soc. Brit. Col., No. 2, p. 9, pi. 2, fig. 4. 

 Southeastern Alaska to San Luis Obisp-, California. 



YOLDIA ENSIFERA PLENA Dall, 1908. 



Proc. U. S. Nat. Mus., vol. 31, p. 2.16. 

 San Diego, California. SO fathoms. 

 167980— 21— Bull. 112 2 



