40 E. A. WALFOED ON THE STEATIGEAPJEICAL 



Teigoxia eoemosa, Lyc. — Though it may appear unsatisfactory 

 to class T. Brodiei. T. formosa, and T. striata from the same 

 horizon and locality, yet certain well- developed shells of the 

 " Brodiei " type pass away into forms which agree so well with 

 moderate-sized examples of T. formosa that it seems to be necessary 

 either to make 2\ Brodiei a variety, or to admit the former into 

 the Oxfordshire list. Locahty : Hook Norton, beds A and B^ 



Teigonia steiata, Miller, is found sparingly and in an indifferent 

 state of preservation in the beds A or B^ of Otley Hill. In Glouces- 

 tershire, according to Wright *, it occurs in the " Cynocephala 

 stage," whilst Lycett records it from the zone oiAm. HumpTiresianus 

 only, referring the shell from the lower zone to T. formosa, 

 T. striata is catalogued as common in the Lincolnshire Limestone. 

 Other Survey Memoirs f quote it from the Great Oolite. 



Teigonia signata, Ag. — The four varieties of this species figured 

 by Dr. Lycett in his Supplementary Monograph, occur in an 

 admirable state of preservation in the higher divisions of the 

 Inferior Oolite of North Oxfordshire. In the beds C of Hook 

 Norton the first forms appear associated with Astarte minima, 

 BJiynchonella spinosa^ and many other species of mollusca, but they 

 become the dominant fossils in the superior stages of other localities. 

 The matrix of the latter stages is either sandy or an intensely hard 

 compact siliceous limestone, from which the extraction of the shells 

 is exceediugly difficult. A bored bed occurs above the Upper Tri- 

 gonia-layer at Hook Norton. Some undescribed forms of Trigonice^ 

 to which I shall presently allude, were procured by me some years 

 since from the Trigonia-bed at Sharpshill near Hook Norton. At 

 the Priory Farm by Chipping Norton and at Gray ton Quarry near 

 Whichford numerous specimens of the several varieties may yet be 

 obtained, but in other localities they are now rare. T. signata, var. 

 Stutterdi, and var. decurtata, have both been found in C of Hook 

 Norton and Otley Hill ; and though Dr. Lycett has referred the 

 former to the superior beds, probably it would be better to restrict 

 the varietal name to the shell of the lower beds (figs. 9 and 10, 

 pi. ii. Foss. Trig., Supp. 2), which is like those found at Cold Com- 

 fort near Cheltenham, and distinct from its allies of the later 

 deposits. T. signata, vars. Zietenii, rugulosa, and decurtata, occur 

 in the higher series. 



Though in Yorkshire T. signata belongs to the zone of Ammonites 

 Humphresianus, in the soath-west of England Lycett gives the Upper 

 Trigonia-grit as its only horizon. 



Teigonia sprNTJLOsA ?, Young and Bird. — A solitary and, unfor- 

 tunately, imperfect example from bed B^ of Hook Norton has many 

 points of resemblance to the shell figured by Lycett (pi. iii. fig. 6, 

 Brit. Foss. Trigonise). The tubercles are more distinct than in any 



* ' A Monograph of the Lias Ammonites,' by Dr. T. Wright, F.R.S., p. 146 

 (Mem. Pal. See. 1879). 



t ' On the Geology of the country around Banbury,' by E. Hull, F.G.S., 

 pp. 24, 25 (Mem. Geol. Surv. 1864). 



