1904.] NATURAL SCIENCES OF PHILADELPHIA. 505 



some enterprising Portuguese on Nantucket, and is employed in various 

 kinds of fishing about the island. 



The set-nets, used in the fall for catching bonito, are hung in the 

 "Cod" of the Bay — the sheet of water enclosed by the arm of the 

 island called Great Pomt. 



Collections of Nantucket fishes have been made by the senior writer 

 and presented by him to the Academy of Natural Sciences of Philadel- 

 phia. The * affixed to certain species indicates that material from 

 this source has been examined. 



In conclusion, we wish to thank the members of the "Petrel Com- 

 pany " for their kindness and interest in helping us in this work. 



PETROMYZONTIDiE. 

 Petromyzon marinus Linnaeus. (" Lamprey.") 



Specimen taken in the pound, April 28, 1904, about 3 feet in length. 



GALEORHINID^. 

 ♦Mustelus canis (Mitchill). 



Found associated with Squalus acanthias. 



Prionace glauca (Linnceus). ("Blue Dog." "Man-eater.") 



Caught with the sand shark (Carcharias littoralis), but by no means 

 so common. 



"Sharking" is one of the sports of the island. Those caught are 

 not used now commercially. Some years ago, when "sharking" was 

 carried on regularly at Wawinet, a village at the head of the harbor, 

 the livers of all the sharks caught were saved, dried out in the sun and 

 the oil shipped away. 

 Carcharliinus obscurus (Le Sueur) 7 



About 6 or 8 examples probably of this or some closely related 

 species have been taken at various times at or near Great Point. A 

 large example was taken by the senior writer during the summer of 

 1877, weighing 650 pounds. It measured 11 feet 6 inches. 



SPHYRNID^. 

 *Sphyrna zygaena (Linnaeus). 



Two examples seen. One washed ashore many years ago, and another 

 taken in a set-net September 25, 1903. The latter examined by the 

 junior writer. 



ALOPIID^. 

 Alopias vulpes (Gmelin). ("Thrasher.") 



Two examples seen. Both taken at Great Point, one with a line 

 and the other in the pound. The tail of the latter measured 7h feet. 



