SUPPLEMENT PLATE IV. 



Plate IV, is intended to illustrate the Oxfordshire varieties of Trigonia sipnata, Ag. 

 The figures have been selected from specimens liberally placed at my disposal by Mr. 

 Stutterd, of Banbury, taken from his cabinet, and obtained by him at Rollright, near 

 Chipping Norton ; these, together vi^ith the examples figured upon Plates I and II, will 

 sufficiently illustrate the four Oxfordshire varieties of T. signata. 



FIG. 



1. Trigonia signata, Ag., var. Stutterdi, Lye. A double valved specimen in 



the collection of Mr. Stutterd. 

 (Page 9.) 



5 and 6. •,, „ Two other specimens of the 



same variety. My cabinet. 



2 and 4. ,, var. rugulosa, Lye. (Page 8.) My cabinet. 



3. „ var. decurtata, Lye. (Page 10.) My cabinet. 



7. „ var. Zietenii, Lye. (Page 5 .) My cabinet. 



All the specimens figured are from the Inferior Oolite. 



