That one of these creatures guards an area named after four nymphs who were Atlas's daughters.
According to Propertius, one of these creatures protected a tiny city twenty miles away from Rome in exchange for a basket of food from a fearless beautiful virgin.  According to Pliny's Natural History, they dwell alongside elephants in Ethiopia, but the largest types of them are to be found in India. According to the Theogony, Lamia and one of these animals can be found by the waters of Styx. Another creature of this type eventually became connected with the North Pole after it was subdued. That one of these creatures guards an area named after four nymphs who were Atlas's daughters. A pair of them pulls the chariot of Medea. While at Colchis, Jason plants the teeth of these creatures in order to appease King Aeetes. Another one of them guarded the golden apples of the Hesperides before it was incapacitated by Heracles. For 10 points, identify this type of creature exemplified by Ladon, which became the constellation of Draco.
According to Propertius, one of these creatures protected a tiny city twenty miles away from Rome in exchange for a basket of food from a fearless beautiful virgin.  
dragons or serpents