MOLLUSCA (except CEPHALOPODA). 131 



Clay fossils are the long tubes formed by the boring Gallery 



lamellibranchs Teredo and Teredina, allies of the modern „ 1^^^^' 



''ship-worm." Pyrula Smithi and Xenopliora extensa are 5, 



noticeable gastropods. Aporrhais Soiuerhyi is a gastropod 



from Oldhaven Gap. Characteristic of the Woolwich beds 



are Gorhicida [Cyrerta] duhvichensis, Corhida regidhiensis, Pitli- 



arella Bickmani, a freshwater shell, and Ostreo. hellovacina, 



of which a fine mass is exhibited. From the Thanet Sands 



come Gyprina Morrisi, Pholadomya cimeata, and Meretrix 



orhicularis. In the middle of the Gallery stands a slab of 



" Bognor Eock " from the London Clay of Bognor, largely 



composed of shells or the casts of shells of Cardita Brong- 



niarti, Glycimeris [Axinacct] hrevirostris, Volsclla [Modiola\ 



elegans, Vohita denudata, Pyrida Siyiithi, Natica hantoiiiensis, 



and the annelid Vermctus hognoriensis. Other masses of the Between 



same age from Fareham, Hants, are placed on the wall ; one 'W'all-cases 



is full of shells of the lamellibranch Pinna affinis, the other and 



(Plate V.) contains in addition Glycimeris hrevirostris and 4 & 5. 



the smaller G. decnssata. 



Cretaceous. This series is rich in specimens desciibed 

 by G. A. Mantell, Samuel Woodward, James Sowerby, Table-cases 

 J. de C. Sowerby in Dixon's *' Geology of Sussex," H. Woods, 

 and others. Except those from the estuarine or lacustrine 

 deposits of the Wealden series, all are marine. First come Table-ease 

 the shells from the Upper and Middle Chalk and Chalk e. 

 Eock, in other words from those zones that are of Senonian 

 and Turonian age. Among these the lamellibranchs of the 

 genus Inoceramus are conspicuous and their disintegrated 

 shells enter largely into the composition of the Chalk : 

 /. Cuvieri may attain a width of 18 inches, some large pieces 

 of its hinge are shown ; /. lahiatus gives its name to a Wall-case 

 Turonian zone ; the original specimen of the widely dis- 5a. 

 tributed /. Crippsi is of historical importance, ^pondylns Table-case 

 spinosus with the long spines well preserved (Fig. 70), and 6. 

 the five-ribbed fan-shell Neithea quinqiiecostata (Fig. 71 a), 

 are characteristic of the Upper Chalk; the gastropod P/e?^- 

 rotomarict perspectiva is Turonian. Here too are tubes of 

 Teredo amphisbwna, and several specimens of the curious 

 Badiolites Mortoni, one of the Eudista3 (see p. 143). 



Following on these are shells of Cenomanian age, Table-cases 

 coming from the Lower Chalk, Upper Greensand, and Chalk 6 & 7. 

 Marl. Here may be noted the cocks-comb oyster Alcctryonict 

 carinata, the scollops Cldamys Beaveri and C. asper, of which 

 the latter gives a name to the " Pecten asper zone," the 



