Sentence:  ... the numerous families of coral, which, under the form of tubular, starry, or stony stems, are denominated tubipores, madrepores, and <WSD>isises</WSD>. 
Meaning of the word marked with <WSD> tags:  Any coral of the genus "Isis", or family (noshow=1), composed of joints of white, stony coral, alternating with flexible, horny joints.