376 REPORT OF THE 



The Sea Lamprey has been obtained in Gravesend Bay in March, April and June 

 in small numbers. It does not live in captivity, because its proper food cannot be 

 obtained. 



Clas3 PiSCe3. TI)e Pisf)es. 



Subclass SELACHII. Sharks and Skates. 



Order ASTEROSPONDYLI. Typical Sharks. 



Family PSEUDOTRIAKID^E. 



2. Small-toothed Nurse Shark {Pseiij^otriakis microdon Capello). 



The Pseiidotriakis is known from only two specimens. The first of these was 

 described from Portugal and the second, about lo feet long, was secured at Ama- 

 gansett, Long Island, by the crew of the Life-Saving Station. This example was 

 fully described by Bean in Proceedings, U. S. National Museum, page 147, 1883. 

 It is figured in Oceanic IchtJiyology, and also in part IV, Bulletin 47, U. S. National 

 Museum, pi. IV, figure 14. 



Family GALEIDiE. Requiem Sharks. 



3. Smooth Dog Fish {Mustehis amis Mitchill). 



The Smooth Dog Fish is described by DeKay under the name of the American 

 Hound-fish. DeKay usually found their stomachs filled with small Crustacea and 

 seaweed. The largest one he saw did not exceed 3 feet in length, but he quotes 

 Mitchill's statement that it sometimes reaches the length of 4 feet. 



Ayres says it is the only common shark in Old Man's Harbor and vicinity. In 

 the stomach of one he found shrimps, a small crab, and fragments of a sea clam. 

 This shark has been brought alive from Gravesend Bay in August, September and 

 October. It is very restless and delicate in captivity, often coming to the surface and 

 trying to escape. Specimens were obtained in the Atlantic off Southampton, in 

 Wigo Inlet, and at Islip, in August and September, 1898. 



This little shark is not eaten, but is frequently used for its oil and m making 

 fertilizers. It is a very common fish in the North Atlantic. 



4. Tiger Shark {Galeocerdo tigrinus M. 8z: H.). 



The Tiger Shark, also called Leopard Shark and Spotted Shark, is a common 

 inhabitant of tropical seas, ranging northward occasionally to Cape Cod and to 

 San Diego. It grows to the length of 30 feet, and is noted for its ferocity. 



It arrives in Vineyard Sound, according to Dr. Smith, in August, and remains 



