410 E. Ray Lankester — East Anglian Brachiopoda. 



Immediately above the Olive Shale is a hard band of purple 

 micaceous grit, full of large specimens of Lingula cornea, this bed is 

 well exposed at the Tin Mills. Lying above these purple beds is a 

 bed of grey sandstone, very barren, the only remains yet brought to 

 light being Lingula cornea and carbonaceous markings, and these 

 very scarce and imperfect. This bed may be best examined near 

 Onibury. Immediately above this last rock are the thin, flaggy, 

 micaceous sandstones, the base of the Old Eed, in which beds not a 

 single trace of organic life has yet been observed ; yet I have no 

 doubt that further search will be rewarded by the discovery of 

 traces of Pterygotus, Pteraspis, and Cephalaspis, as they are found 

 both below and above them, and consequently must have lived not 

 very far off during the period of their deposition. 



IV. — Ok a New Large Tbrbbbatula occukring in East Anglia. 



By E. Eat Lankester, B.A., Coutts Geological Scholar, Oxford. 



("With a "Wood Engraving.) 



THE forms which Mr. Davidson in his invaluable Monograph has 

 included under T. ovoides, are so various that it would be 

 possible to refer the shells figured in the plate to that species, but 

 since T. irilineata, from the Inferior Oolite, and T. lata and T. ovoides, 

 from drift-blocks — which I shall endeavour to show are of the very 

 latest Jurassic horizon — are very difi'erent in many respects, I prefer 

 to give a new name to this form, which may find its place near T. 

 ovoides and T. simplex. The specimen drawn. Fig. 1 and \a, is from the 

 collection of Mr. Eoper of Lowestoft, who obtained it, with another 

 specimen, from a gravel-pit at Thorpe in Suffolk. It has the general 

 simple form of 2\ ovoides, but is remarkable for its great size. The 

 imperforate valve is flattened in the mesial line, whilst the perforate 

 valve is deep and raised into a well-pronounced keel in the mesial 

 line extending from the beak ; the foramen is small. The specimen 

 figured is longer than the other in Mr. Eoper's collection, which has 

 the shorter, squarer form of Fig. 2, resembling T. simplex. This 

 fine Terelratula may be known as T. rex. 



In the British Museum and in the Ipswich Museum are portions of 

 a block crowded with a Terelratula. The block was found by Mr. 

 Charlesworth in a gravel -pit near Snape in Suffolk. The specimens 

 in the fragment in the British Museum present a family likeness to 

 T. rex, but they are shorter, squarer, and fuller, the imperforate 

 valve being slightly convex. The block which contains them is 

 evidently the same matrix as that which embedded Mr. Eoper's 

 T. rex, whilst Mr. Eoper's specimens are like unwieldy examples 

 of Sowerby's T. ovoides — bearing the same relation to the well- 

 marked specimens, such as Mr. Eose's from Stow-Bardolph, No. 

 44,503 in the British Museum as do the irregular gigantic speci- 

 mens of T. depressa from Upware to the beautiful and really elegant 

 T. nerviensis of Belgium. It is difficult to look upon the specimens 

 from Snape in this way, and the late Dr. Woodward had, we find, 

 indicated T. homologaster (a Brown Jura species from Wiirtemburg 



