156 VINE: FOSSIL POLYZOA : ADDITIONS TO THE CRETACEOUS LISTS. 
Habitat : On Broken Shell embedded in Blue Clay. 
Horizon and Locality : Gault, Folkestone. 
V. Hippothoa ? 
On the outer surface of a small bivalve shell in my possession 
are several peculiar organisms, which closely resemble in some of 
their Zooecia at least, Hippothoa simplex d'Orb. (Terr, Cret. pi. 711, 
fig. 6), but the habit of the Zoarium is more tortuous than the frag- 
ments depicted. In other respects the Gault forms are more like the 
creeping stolons of species of Aetea, similar to those depicted by 
Hincks' (British Marine Polyzoa, pi. 1, figs. 8 and 12). I can only 
indicate the existence of this peculiar polyzoon in the hope that 
better examples may be found. 
Horizon : Gault, Barnwell, Cambridge. 
D'Orbigny, in one of the appendices to his work on Cretaceous 
Bryozoa (p. 1082) divided the then known French Geological 
Formations into several minor divisions, or stages, to each of 
which he gave a characteristic name. In some of these French 
divisions, previously to the commencement of d'Orbigny's labours, 
Polyzoa, or Biyozoa had been recorded, and these are fully referred 
to in the " Prodrome de Paleontologie" by the same author. In the 
Paleozoic formations 66 species had been described. In the 
Jurassic rocks 93 species ; and in the Cretaceous formation, which 
was divided into the following stages, 17 Neocoinian, 18 Aptian, 
19 Albian, 20 Cenomanian. 21 Turonian, 22 Senonian, and 23 Daman. 
D'Orbigny, after the completion of his labours on the Bryozoa. 
catalogued about 1073 species. Of course a number of these were 
ficticious, but as the whole are well described and illustrated we owe 
to the illustrious author a debt of gratitude for his painstaking 
and discriminating labours on the Cretaceous Bryozoan Group. 
In the "Albian" division (No. 19) only 22 species are recorded 
by d'Orbigny, but the number which were really proper to the French 
Albian rocks were only 16, the other 6 species are otherwise accounted 
for. In this paper I have given descriptions of 4, probably 5, species 
found on the British Gault, and in the hope of stimulating enquiry 
in this direction I append the names and references to the plates and 
