618 JIE. C. B. WEDD ON THE [NoV. 1 898, 



sp. ?) may be recorded, the foraminifer on the authority of 

 Mr. F. Chapman. In a slice of this rock Mr. Chapman noticed also 

 other fragments of foraminifera, which, he states, may be Haplo- 

 jihragmium and Valvulina. 



In the ' passage-beds ' (2 6 of the field-section) Thecosmilia 

 annularis, Flem., occurs abundantl)', and has not been previously 

 found at Up ware. 



From the two exposures of Elsworth Rock, 



Ammonites {Cardioceras) MaricB, I Ehynchonella varians, Schloth. 



d'Orb. JDiastcpora {Berenicea) diluviana, 



A. (Peltoceras) Eugenii, Rasp. | Lamk. 



are new to the Elsworth Eock fauna. 



The Woodwardian Museum has also the following unpublished 

 species from the Rock at Elsworth and St. Ives : — 



Ammonites {Cardioceras) cordaU(S,\dkY. Lima suhantiqiiata. Ecem. (Els- 



c\vcavatv-s, Sow. (St. Ires.) worth.) 



Alaria bis]?inosa ?, Phil. (Elsworth.) Opis Phillipsi, Mor. (Elsworth.) 



CeritJiit'.m, s^. (St. Ives.) i Waldheimia onargarita ? , 0pp. (Els- 



Trochus, sp. (Elsworth.) worth.) 



Cypricardia glabra, Bl. &. H. (Els- Hyboclypus gibherulus, Ag. (St. Ives.) 



worth.) I 



A word may be said about the common ^Serjndce^ of the Upware 

 rocks. ' JSer^nila tetragona, Sow.,' appears in the published list of 

 Upware Rag species, and ' Serpula sp.' in the Elsworth list ; in 

 the Woodwardian Collection * Serpula triccrniiata , Sow.,' Elsworth 

 Rock, is found : also ' Serpula sulcata, Sow.,' Oxford Clay. These 

 and the Serpula which forms the thick bed at the top of the Oxford 

 Clay are all unquestionably one and the same form, and that form 

 does not agree with Sowerby's figure and description of S. tetragona, 

 Sow., or with good examples of it in the AYoodwardian Museum 

 from the Oxford Clay elsewhere. They all appear to belong to 

 Vermilia sulcata, Sow. There occur, however, among the thick 

 m.asses of the Serp)iila-hed, and singly on Grgplicea. occasional tubes 

 somewhat like Sowerby's S. tricarhiata, if this be really a distinct 

 species, but otherwise appearing to be possibly only the first stages 

 of the tube of Vermilia sulcata. 



Discussion. 



Afr. HiTDLESTON Commented on the fortunate circumstance that 

 so remarkable a development of limestone in the midst of the Eenland 

 clays was suf&ciently near Cambridge to attract the attention of 

 geologists, so that any fresh exposures of importance might be 

 recorded from time to time. On the whole, it was satisfactory to 

 find that the original conclusions of Blake and Hudleston as to the 

 relations of Rag and oolite to each other had been more or less 

 confirmed by most of the subsequent writers. In such a series mere 

 stratigraphy counted for very little ; one could not trust the beds 

 when once out of sight, while in the present paper abundant evidence 

 of undulation and reversal of dip had been brought forward. 



