10 NOTICE OF UNDESCRIBED ZOOPHYTES 



having its horizontal ramus some what straightened ; its depth 

 about the fourth part of its length. And — 



Thylacotherium Bucklandii, (Didelphis Bucklandii, Bro- 

 derip), having its horizontal ramus narrower and more curved. 



Such are the zoological characters at present known of 

 this genus of fossil Mammalia. 



Art. II. — Notice of Undescribed Zoophytes from the Yorkshire 

 Chalk. By John Edward Lee, Esq. 



Professor Phillips, in his " Illustrations of the Geology of 

 the Yorkshire Coast," has observed, that " the interesting re- 

 mains of Spongice are nowhere so well developed as in Eng- 

 land, and perhaps nowhere in England, so well as in 

 Yorkshire. On the shore near Bridlington, they lie exposed 

 in the cliffs and scars, and being seldom enclosed in flint, 

 allow their organization to be studied with the greatest ad- 

 vantage." 



This locality however, does not seem to have attracted the 

 attention it deserves : the chalk cliffs from Sewerby to the 

 Danes' Dyke on the south of Flamborough Head abound in 

 Zoophytes, and a diligent collector will not be long in obtain- 

 ing an extensive suite of specimens ; the chalk is of such a 

 nature as to admit of being easily worked, so that the fossils 

 may be cleared without much difficulty, and their characters 

 properly exposed. The labour however has only commenced : 

 the varieties in form, and the gradations from one to another, 

 are almost endless, and the difficulty in determining species 

 is so great, that it almost operates as a bar to the study of 

 these remains ; still as every additional fact respecting them 

 must be of some value, where so little comparatively is known, 

 I shall endeavour to give a description of several species 

 which appear to me to be new; and should it afterwards 

 prove that I have been mistaken, they can then be referred 

 to their proper situations. — Two of the species described seem 

 to be Siphonice ; four, or perhaps five, may for the present be 

 considered as sponges, and one seems to be a Udotea. 



It is a curious fact, that though the locality from which 

 these fossils were obtained, is extremely rich in Zoophytes, 

 yet the rest of the Yorkshire chalk is comparatively barren : 

 this is particularly the case with the southern part of the 

 range ; I have sought almost in vain, for any specimens 

 worthy of preservation, in the numerous chalk pits from Mar- 

 ket Weighton to Hessle. 



