154 
from the “ Pea Grit”? of the Cotteswold Hills, which he had 
compared with examples in foreign Museums, especially with 
those of the Museum of Caen, in Normandy. 
After a brief reference to the existing species of Polyzoa, Mr. 
Loner spoke of those of the Oolites as having been very little 
studied, and not described at all by any English writer; the only 
systematic account of them being contained in a memoir by 
Jutzs Harmiis, published in 1844, in the Memoires de la Société 
Geologique de France. 
Mr. L. described the Zoids of the Polyzoa, and their relation 
to the compound structure of which they form part, illustrating 
his description by a copy from Professor Auuman’s figure of 
Lophopus crystallinus, a British fresh-water form. He pointed 
out that the Zoid of the Polyzoa differed from the Zoids of the 
Actinozoa and the Hydrozoa, more particularly in having an 
intestine and anus, the other Zoids having only one orifice 
and no intestinal canal. He held that Zoids of the Polyzoa, 
like the Polyps of other compound forms, could not properly 
be regarded as complete animals, but only as the feeding and 
digesting organisms by which the whole structure is nourished. 
He next referred to the division of the Polyzoa into two 
orders, the “ Cheilostomata”? and the “ Cyclostomata”—that 
this division is based on a difference in the cells, but more 
particularly on the presence of opercula in the orifices of the 
cells in the Cheilostomata, which are wanting in the Cyclos- 
tomata. He pointed out the confusions, discrepancies, and 
even self-contradictions in the way in which this division has 
been applied to the Cretaceous and Oolitic forms by D’Orzieny, 
Micueuw, Hacenav, and Haris, particularly in reference to 
the Mesenteriporide and the Escharide, which were supposed 
by all these writers, except Mrcueni, to belong to different 
orders, the Mesenteriporide to the Cyclostomata, and the 
Escharide to the Cheilostomata. 
Mr. L. thought that the well-preserved specimens of Mesen- 
teroporide which the Cotteswold beds furnished, showed that 
they were very intimately connected with the Hscharide of 
later periods; and he held that the latter group were only 
