J. F. Walker — L. Greensaiid Brachiopoda. 561 



Mr. Davidson, and I now propose to give the result of the examina- 

 tion of the new forms in this paper ; also to more fully describe a 

 Bhynchonella from the Inferior Oolite of Lincolnshire, which I 

 have named Bhynchonella Grossii. 



Among the Upware specimens, the following new species and 

 varieties have been met with : — 



Terehratula Seeleyii, n. sp. Figs. 6, 7, and 8. — Shell elongated, ovate, 

 moderately convex, shell surface smooth, marked by faint concentric 

 lines of growth ; ventral valve convex, curving regularly to the beak, 

 which is very slightly recurved, and is truncated by a large round 

 foramen ; beak ridges slightly rounded, space between them and the 

 deltidium flat ; deltidium in one piece, large and moderately wide ; 

 dorsal valve elongated, moderately convex, the front margin not 

 plicated, rounded; the shell becomes thin towards the front and 

 lateral margins ; greatest width about the middle of the shell. 

 Loop short. Dimensions of the specimens figured : length 1 -5 in., 

 breadth 0*9 in., thickness 0*7 in.; and length 0-9 in., breadth 0-6 in., 

 thickness 0-35 in. I have much pleasure in naming this fossil in 

 compliment to H. Gr. Seeley, Esq., F.G.S. This species is well 

 marked by its elongated form and absence of plications. 



Terehratula depressa. — The specimens referred to this species vary 

 so much from each other that it is necessary to distinguish the fol- 

 lowing sub-species, in addition to the sub-species T. cyrta, nobis. 



Var. T. uniplicata, Figs. 1 and 2. — Shell someAvhat triangular in form, 

 with one wide mesial fold ; shell surface smooth, marked by faint con- 

 centric lines of growth, greatest width about the middle of the shell ; 

 from thence it tapers to the beak, which is nearly straight, and is 

 truncated by a large circular foramen ; beak ridges rounded ; deltidium 

 wide, in one piece. At the front margin there is a wide central fold, 

 formed by a depression of the ventral and a corresponding elevation 

 of the dorsal valve. Loop short. Dimensions of the figured speci- 

 men ; length 2*4 in., breadth 2-1 in., thickness 1-2- in. 



Var. Terehratula Gantahridgiensis, Figs. 3, 4, and 5. — Shell mode- 

 rately convex, surface smooth, marked by concentric lines of growth; 

 beak slightly recurved, deltidium wide, in one piece ; front margin of 

 the ventral valve slightly elevated at the centre, then depressed, and 

 again elevated ; dorsal valve has two ridges which rise from near the 

 centre of the valve, and terminate at the front margin, having between 

 them a wide central depression. Loop short. Dimensions of the speci- 

 men figured: length l"7in., breadth 1-25 in., thickness 1*05 in. This; 

 form varies considerably with regard to the thickening of the front 

 margin ; some specimens have the front margin thinner and more 

 rounded than the specimen figured, but retain the same form of pli- 

 cation, being reverse to the var. T. uniplicata, which has the central 

 elevation on the dorsal valve and the depression on the ventral valve. 

 T. Gantahridgiensis difiers from T. Dutempleana in having the beak 

 less recurved and the front margin more rounded. This variety 

 approaches T. prcelonga in the plications, but differs from that species 

 in its greater width, form of its beak, etc. 



Terehratula Davidsoni. — I have obtained a very small specimon of 



