162 REPORT—1883. 
in his work on‘ The Geology of Oxford and tke Valley of the Thames,’ 
' furnishes a list—about forty-eight species—of British Cretaceous 
Polyzoa. In Dr. Mantell’s works, and also in Dixon’s ‘Geology of 
Sussex,’ many species are partially described and figured. 
: The best stratigraphical list of species known to me is the one 
furnished by Mr. Newton in the ‘Catalogue of Fossils in the School of 
Mines—Cretaceous Division,’ and as this is an account of actual speci- 
mens gathered from various horizons and from very wide localities in the 
British area, I shall make it the basis of this Report. As I have only 
partially examined the collection, I must depend upon the species in my 
own cabinet, and those lent to me by Miss E. C. Jelly, for furnishing 
the minute details necessary for this Report. It may be as well, however, 
to give the various horizons in ‘which Polyzoa have been discovered and 
catalogued. 
Lower Greensand, Speeton Clay, &c., 20 species, 13 genera. 
Blackdown Series—Traces only. 
Upper Greensand Series ; t OL? OFS: 16) ey 
Lower Chalk : ; ; é PDS Pasa 
Upper Chalk 3 : : se Sag fO5 f° et 
- Only some of these, according to Mr. Newton, range from the lower to 
the upper beds. 
As in my previous Report on Jurassic Polyzoa, I shall adhere as 
closely as possible to the classification of the Rev. Thomas Hincks, as 
given in the ‘ British Marine Polyzoa,’ beginning with the Cyclostomata. 
Class Potyzoa. 
Sub-order CycLosromara, Busk. 
Family I. Crisp, Busk. 
No fossils, belonging to this family, are at present known to have 
existed in either the Jurassic or Cretaceous epochs. 
Family II. (1880). Tusuiroripz, Hincks. 
1. Sromatopora, Bronn. 4, EnraLopHora, Lamx. 
2.. TupuLirora, Lamarck. 5." DIAsTorora, 5) = paral: 
3. IpmonnaA, Lamouronx. 
Genus Sromatoprora, Bronn, 1825. 
= Alecto, Lamx. 
‘Zoarium repent, wholly adnate, or free at the extremities, or giving 
off erect processes ; simple or branched; branches more or less ligulate. 
Zowcia in great part immersed, arranged in a single series, or in several, 
which take a linear direction or are very slightly divergent.-—‘ Brit. Mar. 
Poly.’ p. 424..! 5 
The typical Stomatopora of the Cretaceous Rocks are of a very simple 
character. Only three species are given by Morris, three by Phillips, 
and one by Mr. Newton in his ‘ School of Mines Catalogue.’ 
1 The nearer we approach the Cainozoic and recent types of Polyzoa, the greater 
is the necessity for extreme caution in our grouping of the fossil forms. I have, 
therefore, in this Report adopted the generic characters of Hincks in his own words, 
and have endeavoured to limit the various groups accordingly. 
