97 



Fig. ö5. Thecocarpus niger Nutt 

 Kolonie in Ranken auslaufend mit Corbulae. 

 (1. Fig. 82.) 



Fig. 66. Hydrothek von oben mit Doppel- 



zilhnen. fl. Fig. 84.) 



Fig. 67. .lunge Corbula mit einer Hydrothek an der Basis jedes Corbulablattes. (I. Fig. 85.) 



angle of 35°, with deeply notched borders, wifch 4 teeth on either .side, 1 tooth in 

 front strongly curved inwards, with the back edge fused with the stera. There is a tbin 

 transverse septum in the lower part of the calyx, dividing the interior into two parts ; 

 there are two transverse septa in each Joint of the branchlets, one continous with that of 

 the hydrotheca, the other arising from the base of the lateral uematophores. Front-nemato- 

 phore tubulär, the greater part united with the hydrotheca, and projecting a short distance 

 beyond the mouth of the calyx. Neniatophores of stem short, strongly built, 2 to each 

 Joint, 1 above and 1 below the branch. 



Gonosome. Corbula comb-shaped, not-closed, consisting of from 15 to 20 

 metamorphosed branches with indistinct joints and with tubulär, opposite nematophores 

 on either side. There is a hydrotheca at the base of each metamorphosed branch, and 

 Abh.d. II.Kl. d. K.Ak. d.Wiss.III. Suppl.-Bd.2.Abh. 13 



