Sentence:  ... Before the gates there sat / On either side a formidable shape; / The one seem'd woman to the waste, and fair, / But ended foul in many a scaly fold / Voluminous and vast, a serpent arm'd / With mortal sting: about her middle round / A <WSD>cry</WSD> of hell-hounds never ceasing bark'd / With wide Cerberean mouths full loud and rung / A hideous peal; yet, when they list,would creep, / If ought disturb'd their noise, into her womb, / and kennel there, yet there still bark'd and howl'd, / Within unseen. ... 
Meaning of the word marked with <WSD> tags:  A group of hounds.