248 VINE : NOTES ON POLYZOA FROM THE CORN BRASH OF THRAPSTON. 
Since these papers were written I have been allowed to examine, 
study, and select, from more than six hundred fossils, a certain 
number on which Polyzoan encrustations were found. The whole of 
these fossils belonged to Mr. Thomas Jesson, F.G.S., to whose previous 
kindness, by way of loans and gifts, I owe so much. Altogether, 
on the 600 fossils, there were considerably more than 1,200 colonial 
polyzoan growths ; and the whole of these were of such varying habits 
that I almost despaired of ever being able to fix the types for serial 
description. However, rather than further delay the publication of 
notes on the Cornbrash Polyzoa, I make a provisional selection of two 
groups, Stomatopora and Proboscina, in the hope that at some future 
time I may be able to add to the present list of species. 
Before I give a detailed examination of the Cornbrash Stomato- 
pora and Proboscina, I think that it will be both wise and useful to 
future students if I give preliminary studies of the peculiarities of 
the Jurassic forms already described, especially as regards British 
rocks. 
The Genus Stomatopora, Bronn. (1825), may be considered as 
equal to the Genus Alecto (1821), previously described by Lamouroux ; 
the reason assigned for the change of name was, that Leach (1815) 
had already used the term Alecto for an altogether different group of 
fossils. In his " Petrifactions of Germany " Dr. Goldfuss employed 
the word Aalopora for Jurassic species, properly belonging to the 
Stomatopora, or "Alecto" group. Up till 1848 the whole of these 
generic terms were indifferently used by authors. Milne Edwards, 
Johnstone, and d'Orbigny (Prodr. de Palaeont.) used the word 
Alecto, and Reuss (Foss. Polyp, der Wiener.) employed the term 
Aulopora. In his Pabeont. Francaise, Terrains Cretaces (1852) 
d'Orbigny used the word Stomatopora for all those uniserial species 
which were found encrusting foreign bodies, not only in the Cretaceous 
rocks of France, but in other horizons as well. Altogether twenty- 
two species are accounted for, an<l as the synopsis which prefaces the 
descriptive text of the author gives the status of our knowledge of 
this group up till 1852, including the Cretaceous species, it may 
be useful to insert the list here, in d'Orbigny's own phraseology :* 
* Op. cit. p. 834, Ed. 1852^ 
