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510 FISHERIES OF THE UNITED STATES. [124] 



spiNAcnm 



175. Squalus acanthias Linn<5. Spined Dog-fish. 



Photograph. 



176. C en troscy minis cwlolcpis Boc. & Cap. Brown Dog- 



fish. 



Cast. 



scymnim:. 



177. Somiiiosias microcephalus (Bloch) Gill. Sleeper 



Shark. 



Photograph. 



PETROMYZONTIDJE. 



178. Petromyzon mariiuis Linn6. Sea Lamprey. 



Cast. 



