Walker — New Brachiopoda from TJpware, <^c. 455 



deltidium large, in two pieces. The dorsal valve is slightly convex, 

 and scarcely indents the ventral valve. The ventral valve is like- 

 wise convex, or sub-carinate, and is slightly compressed at the sides. 

 The loop extends nearly to the front of the dorsal valve. Length 

 I'lin. to l"3in. ; width 0*6in. to 0'9in. ; thickness about 0*5 in. ; of 

 mature specimens. 



This species is tolerably abundant in the Lower Greensand 

 deposit at Upware. I regarded it as a variety of Terehrirostra 

 neocomiensis, d'Orb., and indicated it under that name in my paper 

 on the Upware deposit ; but it appears to differ from that species, as 

 was pointed out to me by Mr. Davidson, especially in the deltidium 

 being in two pieces, and in the shorter length of the beak. The 

 loop is that of a Waldheimia, and, considering the resemblance of 

 the shell to Terehrirostra neocomiensis, it would seem to confirm 

 Mr. Davidson's supposition of the probable identity of Waldheimia 

 and Terehrirostra. W. Davidsonii varies somewhat in form, being 

 sometimes longer and narrower, sometimes broader and flatter, than 

 the specimens figured. 



I have named this fossil in honour of T. Davidson, Esq., F.E.S. 



Waldheimia Woodvmrdii, sp. n.. Figs. Sa.-d. — Shell rather 

 elongate ovate, external surface smooth, ventral valve strongly 

 keeled. Keel much arched towards the beak, the sides nearly flat, 

 so that a transverse section of the shell forms a nearly equilateral 

 triangle. Beak short, slightly recurved, truncated by a rather large 

 foramen. Dorsal valve ovate, rather convex towards the hinge- 

 margin, and slightly grooved along the centre ; indenting the ventral 

 valves at the front margin. Loop (as indicated by internal cast. 

 Fig. 3d ) about half the length of the dorsal valve Dimensions : 

 length l-4in. ; width 0*9 in. ; greatest depth 0-8 inches. 



This shell, which is very rare, occurs at Upware. I referred it to 

 T. hippopus, Eoemer, in my paper on that deposit. It appears to 

 approach most closely to T. hippopus of any of the Cretaceous species ; 

 but differs in its more elongated form, in the triangular shape of its 

 transverse section, and in having the frontal portion of the dorsal 

 valve nearly flat, so that the ventral valve is very slightly indented. 

 Of Jurassic forms of Terehratula, this species approaches nearest to 

 T. resupinata and T. carinata. 



I have named this remarkable species after the late Dr. S. P. 

 Woodward, to whom science is indebted for many valuable obser- 

 vations in connection with the Brachiopoda. 



Terehratula Dallasii, sp. n.. Figs. 1 and 2. — Shell ovate, length 

 exceeding the width, much inflated, often globose, smooth exter- 

 nally, marked with a few lines of growth, especially on the frontal 

 surface. Beak short, rather straight, truncated by a large foramen, 

 partly margined by a rather wide deltidium, formed of one piece, 

 and generally diminished by the encroachment of the hinge margin. 

 Loop extending nearly half the length of the dorsal valve. Dimen- 

 sions of a globose specimen (Fig. 1) : length 1-2 in. ; width 0-9 in. ; 

 depth 0"9oin. ; of an angular form (Fig. 2) : length 1*1 in. ; width 

 0'8in. ; depth (at the front margin) 1 inch. 



