i 
arguments mainly upon a consideration of the rock and its fossils as seen 
at Hunstanton.’ Further on (p. 593), the authors state certain premises, 
the last of which is as follows: The fossils of the Red Rock at Hunstan- 
ton ‘are chiefly Gault species, and are such as would constitute a deep- 
sea fauna contemporaneous with that of the shallower and muddier water 
in which the Gault of the South of England was formed. ... From 
these premises we come to the inevitable conclusion that the Red Rock of 
Hunstanton must be the equivalent of the Ganlt, and not of its upper 
division only; but that it is a condensed representative of both Lower 
and Upper Gault, formed outside of the limits of the area reached by 
_ mud-bearing currents.’ 
Having given these statements on the authority of Messrs. Hill and 
_ Browne, I will now leave the whole consideration of the question as to the 
horizon of the Red Chalk Polyzoa to others who may be better able to 
decide ; but, instead of giving a consecutive list of the species as already 
described by me from the Hunstanton Red Rock,! I will break the list 
into two parts, showing, first, the species peculiar to the formation ; and, 
secondly, the species whose identities approach nearest to the species 
already described and illustrated by d’Orbigny ard others. This desire 
on my part to keep down the introduction of too many ‘new species’ 
into my list, and so loading our nomenclature, has its disadvantageous 
side, for even those forms which I have placed under d’Orbigny’s names 
may merit separate illustration, as well as the notes on their peculiarities 
already given in the paper referred to. 
ON CRETACEOUS POLYZOA. 395 
I. Species new, and, so far as yet known, peculiar to this Horizon. 
1. Proboscina irregularis, Vine. This species varies much on different 
fossils. 
uberrima, Vine. 
(gracilis, Reuss), var. Reussii, Vine. 
a3 subelegans (approaches nearest to P. subelegans, 
d’Orb., Pergens). 
Hunstantonensis, Vine. Abundant and peculiar. 
-f var. ampliata, Vine. 
% Jessoni, Vine. 
gigantopora, Vine. 
3 dilatata, var. Cantabrigiensis, Vine. (Only a cast found 
on a Red Chalk fossil.) 
10. Diastopora Hunstantonensis, Vine. Most abundant, on various 
ee em OO BD 
fossils. 
a1. rf as variety. The ‘cells’ differ slightly 
from those of the type. 
12. H foecunda, Vine. Not common. 
13. * Jessoni, Vine. Very fine. 
14,, + (Berenicea) contracta, Seeley. 
15 ¥ (Cellulipora) sulcata, Seeley. 
16. Reptomulticava favus, Seeley. 
17. Membranipora Gaultina, var., Vine. 
» Quart. Journ. Geol. Soc. August 1890, pp. 454-486, one quarto plate xix. 
