ON CRETACEOCS POLYZOA. 325 



the junction of the Micrastcr cor-angninum and M. cor-testudinarium zones. 

 The Polyzoa, identified and otherwise, are as follows: — 



Stomatopora ramea, Blainv., 'Man. d. Act.,' pi. 78, fig. 6, Harefield. 



„ sp., Rickmansworth. 



Idmonea (crisina) snbgracilis, d'Orb., ' Terr. Cret.,' p. 738, pi. 614, 



Watford. 

 Entalophora (Clavisparsa) clavafca, ' Terr. Cret.,' p. 776, pi. 621, 

 Watford. 

 „ (Clansa?) obliqua, d'Orb., /. c, p. 896, pi. 623, Watford. 



,, proboscidea, forma raripora, d'Orb., I. c, pis. 621 and 62o, 



Watford. 

 Bicavea dilatata, d'Orb., ' Terr. Cret.,' p. 956, pi. 776, Watford. 

 Truncatula alternata, d"Orb., ' Terr. Cret.,' I. c, pi. 797, Watford. 

 Domopora clavata (Ceriopora, id., Goldf.), d'Orb., ' Terr. Cret.,' 



p. 988, Watford. 

 Actinopora (Apsendesia) diademoides, d'Orb., I. c, p. 764, pi. 643, 

 Harefield. 



Besides the species identified at Watford are the following, indicated 

 by generic names only : — 



Stomatopora (Alecto), Diastopora, Vincularia, Membranipora, and 

 Eschara, sp. 



At Harefield, Rickmansworth, Bushey, Letchmore, and Colnej Street, 

 species (nnnamed) of the following genera have been found, probably in 

 the ' Flint Meal ' from the hollows of flints : — 



Alecto, Diastopora, Defrancia, Cellepora, and Escharina. 



Of the undetermined species I cannot speak, not having as yet' seen 

 the material (' Geol. Lond. and Part of Thames Valley,' p. 80, vol. i.). 



IX. Polyzoa, Charlton, near Woolwich. 



I am not awai'e whether any record has been given of Polyzoa having 

 been found in the Charlton Pit. In 1860 I was living at Woolwich foi' a 

 short time, when I collected both Tertiary and Cretaceous fossils. Re- 

 cently, while examining some of the larger forms, I found the following 

 species of Polyzoa encrusting M. cor-anguinum and Echinocorys vulgaris, 

 but they are by no means fine examples of colonial growths like those 

 found on Gravesend or Chatham fossils : — 



Stomatopora gracilis, Bronn. 



,, Dixoni, Yine. 



Membranipora fragilis, d'Orb, 

 Micropora Roemeri, Lonsd. 

 Cribrilina sp. Too much worn for specific determination. 



X. Polyzoa, Norfolk, Sussex, and Kent. 



For this section of my labours there only remain now the Polyzoa of 

 the Upper Chalk of Norfolk and of Suffolk to chronicle. This I must do 

 on the authority of Professor Morris, as 1 have only a very few fossils on 

 which I could rely for information. The Polyzoa in Sussex are evidently 

 — ^_iudging by Lonsdale's labours, as described and illustrated in Dixon's 



