8 Proceedings of the Biological Society of Washington. 



Subp;enus Anomalosipho Dautzenberg and Fischer, 1912. 



Type Colus dautzenbergi Dall, (=Sipho verkruzeni D. & 

 F. 1912, not of Kol>elt, 1876). 

 Genus Siphonorbis Morch, 1869. 



Type Siphonorbis ebur Morch. Greenland. 

 Genus Kryptos Jeffreys, 1896. 



Type Kryptos elegans Jeffreys. N. E. Atlantic, abyssal. 

 Genus Plicifusus Dall, 1902. 



( Parasipho Dautzenberg and Fischer, 1912. ) Type Fusus 

 kroyeri Moller. Greenland. 

 Subgenus Retifusus Dall, nov. 



Type Tritonium jessoense Schrenck, 1867. Japan. 

 Section Latifusus Dall, nov. 



Type Chrysoddmus griseus Dall. California, abyssal. 

 Section Microfusus Dall, nov. 



Type Chrysodomus acutispiratus Sowerby. Japan. 

 Section Helicofusus Dall, nov. 



Type Chrysodomus laticaudatus Dall. Bering Sea. 

 Genus Exilia Conrad, 1860. 



Type Exilia pergracilis Conrad. Eocene. (Recent ana- 

 logue Chrysodomus kelseyi Dall. San Diego, Cali- 

 fornia. ) 

 Genus Volutopsius Morch, 1857. 



Type Fusus largillierti Petit. Newfoundland Banks. 

 Genus Pyrolofusus (Beck) Morch, 1857. 



Type Fusus deformis Reeve. Arctic seas. 

 Genus Beringius Dall, 1879. 



Type Chrysodomus crebricostatus Dall. Kadiak, Alaska. 

 Genus Liomesus Stimpson, 1865. 



(Buccinopsis Jeffreys, 1867, not Conrad, 1857.) Type 

 Buccimim dalei J. Sowerby. British Crag. 

 G«iuis Ancistrolepis Dall, 1894. 



Type Chrysodomus eucosmius Dall. Bering Sea. 

 Section Japelion Dall, nov. 



Type Buccinum hirasei Pilsbry. Japan. 

 ?Genus Sulcosinus Dall, 1894. 



Type Buccinum f taphrium Dall. Bering Sea. 



I refer Turrisipho Dautzenberg and Fischer, to Siphonorbis; Jumala 

 and Ukko Friele, to Beringius; Neptunea to Chrysodomus; Tritonofusus 

 to the prior Colus, with Sipho Morch not Brown, Neptunella and Sipho- 

 nella. The entire group of Fusinus is separated from Colus by its nuclear 

 characters. 



