EXPLANATION TO PLATK VII. 



. 1. Tliiiini-iii Iliii/n (Liiuiit'us). Part of branch (enlarged ). 



'2. T/iiii<ii -i'i llinjii. Two hydrothecse (greatly enlarged). 



M. Tliiiiiirin llinjit. Single hydrotheca (trn-atly I'lilarjri'd). 



-I. Tlniiiii-iii rliyuiix Kirchenpauer. Part of branch (enlarged). (After K.irchenpauer. ) 



5. Thninrin rulmxln Clark. Side view nf liraiirli (ciilar^c'cl ). 



6. Tliiiinriu nilnialn. Front .view nf liranrh (cnlarsri'd). 



7. Thitiiiriii rnliiisla. 1'art of branch with gonangia (enlarged). 



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