23 
place. In dried colonies of Catenaria parasitica I have sometimes 
found the zooecial rows ending in similar cylindrical internodes, 
but in this species I have not yet been able to find traces of a 
similar metamorphose. The distal wall of Chlidonia is provided 
with one single-pored  rosette-plate, while in Cat. parasitica there 
is aa transverse row of similar rosette-plates. A simple operculum. 
Diazeuxidae Jullien. To this family, at present only con- 
taining the genus Diazeuxia, I must further  refer Chorizopora 
Brognarti, Microporella impressa (Haplopoma n.g.), Schizoporella 
venusta (Trypostega n.g.) and the species of the genus Hippothoa 
which I think must be merged in Diazeuxia. While in all other - 
families of Camarostega the zooecia in the growing edge of the 
colony are only calcified in their posterior part, in this family the 
calcification always keeps pace with the growth. The thin-walled, 
finely striated zooecia are provided with pore-chambers, and the 00e- 
Cia which possess an atrium, and are connected with a rudimen- 
tary distal wall are covered either by kenozooecia (Diazeuxia, Hip- 
pothoa, Haplopoma).… or by rudimentary zooecia (Trypostega) or by 
avicularia (Chorizopord). 
Reteporidae. This very natural family not only contains spe- 
cies growing in free ramose colonies, with or without reticulation, 
but also a number of incrusting species (f. i. Schizotheca fissa, Rliyn- 
chopora bispinosa, Schizoporella scintillans). The zooecia, whose 
walls are very compact and strongly calcified, are provided with a 
distal bow, generally beaded, and with very few single-pored ro- 
sette-plates. Generally the distal wall has only a single, and each 
lateral wall two rosette-plates. The o0cecia are hypostegial and 
originally free"). In all the species growing in free colonies the 
back-side of the colony is invested with a layer of kenozooecia, very 
seldom possessing a distinct cavity (f. i. in R. tesselata, R. lata, 
R. Wallichiana) and immediately continued in the layer of keno- 
7) G. M. R. Levinsen, Mosdyr, Tab. VI, Fig. 27. 
