46 E. A. WAIFOED OX THE STEATIGEAPHICAL 



A single valve, and the only one I have hitherto seen, was got by 

 me from the lower zone of the Great Oolite in the railway-cntting 

 at Ashford Bridge, near Stonesfield. 



Teigonia Wajlfoedi ?, Lye. — T. Walfordi is one of the allies of 

 T. Paind, but differs from the latter in its more erect and narrowed 

 contour and in its subtuberculate costse and their arrangement. 

 The types of the shell were got from Stow-on-the- Wold : the 

 Oxfordshire variety from the Great Oolite of Milton, near Burford. 

 The latter form varies from the type in the less massive character 

 and disposition of its ornamentation. The figure has been wrongly 

 numbered in Supp. no. 2 to Lycett's Brit. Foss. Trigoniae, pi. ii., and 

 should appear as fig. 6, not fig. 8. 



Teigoxia clatkrata, Ag. — The contour of the shell, curvature of 

 the rows of tubercles, and the disposition and number of the rows 

 seem to me to agree so well with Agassiz's species, that I prefer to class 

 the Oxfordshire shell with it, notwithstanding the want of a definite 

 horizon in the description by Agassiz *. The number and curvature 

 of the rows of tubercles of Lycett's T. tuheradosa are very distinct; 

 as in Eigaux and Sauvage's T. davulosa they are more numerous, 

 and there is in those species an absence of that downward curvature 

 or inflexion which T. clathrata seems to present. The markings on 

 the area are worn, but appear to hav^e been fine. I have noted in 

 other Trigonice, e. g. T. signata, that the fineness or coarseness of the 

 area-markings is often due to the state of preservation of the fossil ; 

 the bolder area-markings seem to underlie the others. The only 

 example I have seen of Agassiz's species is in the collection of Mr. B. 

 Thompson, P.G.S., who has kindlj' lent it for my examination. It 

 was got from the Forest Marble or Cornbrash of Kidlington, Oxon. 

 T. clathrata is quoted by Terquem and Jourdyf from the zone of 

 Ammonites Parhinsoni of their Bathonian of the Moselle region. 



Teigoxia Goldefssi, Ag. — In "Whiteave's ' List of the Fossils of 

 the Cornbrash at Islip and Kidlington ' this species finds a place. It 

 maj", however, be the T. Painei of Lycett, who has stated his reasons 

 for rejecting T. Goldftissi as a British species J. Sharp tabulates it 

 from both Great and Inferior Oolite of the ^^Northamptonshire 

 district §. 



Teigoxia. electa, Mor. & Lye. — The Forest Marble of Kirtlington 

 has yielded, so far as I know, the only Oxfordshire specimen. The 

 intensely hard matrix makes the extraction of complete shells well- 

 nigh impossible. 



Teigoxia ttjeeeculata ?, Lye. — The same Forest-Marble stratum 

 at Kirtlington, in which is found T. fiecta, has also supplied me 

 with a small tuberculate Trigonia agreeing in many points with the 



* * Memoire sur les Trigonies,' par L. Agassiz. tab, ix. fig. 9, & p. 22. 



t " Monographie de I'etage Bathonien dans le departement dela Moselle " par 

 O. Terquem et E. Jourdy, pp. 109 & 161. Mem. Soc. Geol. de France, 1869. 



j ' Mon. Foss. Trigoniae,' by Dr. J. Lycett, p. 59. 



§ "The Oolites of IS'orthamptonshire " by S. Sharp, F.S.A, F.Gr.S. ; Quart. 

 Journ. Geol. Soc. vol. sxvi. pp. 383 & 388. 



