    nténce 1:’How are.the combs. spacéd’?    ntence: 2: : From each “balancer in the  istatocyst” a eiliary “groove runs ‘out. uhder  he :dome’‘ and then -splits to ‘connect’ with,  two :adjacent ? comb . rows,” “and .in’ ’ some  species “runs .all the. way .along. thé comb  OWS: