1) Eretmochelys imbricata 2) Hawksbill 3) Hawksbill turtle 4) Marine turtle 5) Sea turtle 6) Tortoiseshell turtle 1) Hawksbill 
• (n.) A sea turtle (Eretmochelys imbricata), which yields the best quality of tortoise shell; -- called also caret.
Hawk'bill` (-bĭl`) noun (Zoology) A sea turtle ( Eretmochelys imbricata ), which yields the best quality of tortoise shell; -- called also caret . 
USS Hawkbill was an American Balao Class submarine of 1525 tons displacement launched in 1944. USS Hawkbill was powered by diesel engines providing a top speed of 21 knots, carried a complement of 75 and was armed with one 4-inch gun, two 20 mm Oerlikon anti-aircraft guns; six 21 inch bow torpedo tubes and four 21 inch stern torpedo tubes.