VINE : BRITISH PALEOZOIC CTENOSTOMATOUS POLYZOA. 79 
dently of each other we should have both arrived at similar conclu- 
sions respecting the peculiar group of organisms now under considera- 
tion, and although 1 may have been the first to suggest the relation- 
ship, the honour is due to him for first adopting the sub-order Cten- 
ostomata into his elaborate synopsis, and afterwards to found a new 
genus for the reception of new types. The only family given by 
Ulrich (op. cit., p. 367) is Ascodictyonida?. 
Before venturing to give further details respecting the problematic 
affinities of the fossil forms now being described, it may be well to 
draw attention to the following remarks on recent Ctenostomata 
derived from a study of the species referred to by Mr. Hincks (Brit. 
Mar. Polyzoa,. 1880). 
The Sub-order Ctenostomata, Busk, is divided by Mr. Hincks 
into two distinct and characteristic groups. 
Group (a j Halcyonellea, Ehrenberg (Brit. Mar. Polyzoa, p. 490). 
Group (b) Stolonifera, Ehlers, ( ,, „ p. 512). 
Mr. Busk, however, in his Challenger Report,* accepts the first 
of these divisions, Halcyonellea, but re-establishes (in part) Johnston's 
name for the Stoloniferous group. 
Division II. Vesicularina (pars.) Johnston. (Challenger Report, 
pt, ii., p. 32). 
I pass over group (a) because, at present, I have no knowledge 
of any fossil forms that could be referred to it, and I accept Mr. 
Hincks' divisions of group (b) on account of its fuller diagnosis. 
II. Stolonifera. Ehlers (Hincks Brit. Mar. Polyzoa, p. 512). 
Zoarium, horny, or membranous. Zocecia developed by budding 
from the inter nodes of a distinct stolon or stem. As the fossil forms 
appear to me to have relationship with some, at least, of the recent 
Ctenostomata, I select for remarks those families only, with their 
principal genera, where the relationship seems to be more superficially 
apparent. 
Family IV., VesiculariiD;E. 
Zooecia, contracted below, not closely united to the stem at the 
* Report on the Polyzon, Part II, 1886. 
