154 



INVERTEBRATA. 



Hamites ? 



Fragment of a small round-sectioned Hamite, with prominei 

 rounded ribs, which are mostly simple — only one of them is seei 

 to bifurcate. They are separated from one another by more thai 

 their own breadth. 



Locality. Upware (Coll. Mr J. F. Walker, of York). 



?Gervillia solenoides, Defrance. 

 Locality. Upware (Coll. Mr J. F. Walker, M.A.). 



Terebratula ovoides, Sowerby. 



Variety rex, Ray Lankester. 



(Plate VIII., fig. 10, a, 6.) 



Terebratula ovoides, Sby., Min. Con., t. 100, p. 227. 

 Terebratula rex, E. Ray Lankester, Geol. Mag., 1870, p. 410. 



A species to which much doubt and considerable interest 

 attaches, on account of its wide distribution in boulders, while it ij 

 unknown in situ. It is a large species, with a very characteristi 

 medial ridge along the large valve, and with the dorsal valve fre- 

 quently flattened in the specimens from Upware, S. Willingham, 

 and Herrimere. 



The lateral beak ridges may be sharp and the lines of growtl 

 may become developed into imbricating squamae. 



Sowerby's original specimens were from a sandstone bouldei 

 " a sandstone containing green sand " found in Suffolk [T. ovoidi 

 and T. lata, Sow., Min. Con., I. p. 227), and I have found it in 

 hard green-grey sandstone boulder at South Willingham in Liai 

 colnshire, also at West Dereham, near Downham Market. 



But its most interesting occurrence is at Herrimere, N. oi 

 Upware on the Cam, for here it occurs associated wdth othei 

 fossil! whose age can be determined, namely, Lower Cretaceouj 

 I have already (see ante, p. 35), given my reasons for believing 

 that this occurrence at Herrimere is not in situ, as has been statec 

 elsewhere {Geol. Mag., 1870), nor of Jurassic age, but that it \i 

 really a boulder of Neocomian sandstone. 



