ON NEW BRACHIOPODA. 165 



roundecl at sides and front ; exterior surface smooth ; beak 

 slightly projecting ; foramen cncroacliing on both valves, 

 round ed. 



Obs. — I liave five examples of this shell from tlie Oolite 

 of Hampton. The interlor of the dorsal valve possesses a 

 well defined circular rldge, entirely encircling the inner 

 portion of the shell. In this species I have been unable to 

 observe any trace of a central septum, which in those 

 previously figui-ed is well defined. The examples that 

 oecur in the Coral Eag, at Lyneham, are of the same 

 species, and are equally rare. 



Zellania oolitica, Moore. 

 PI. I, figs. 18-20. 



Shell suiall, triangulär, rather longer than wide; front 

 rounded ; valves tapering to the beak, smooth, distinctly 

 punctuate, thickest at the umbo ; sides thick, flattened ; 

 hinge-line very short ; foramen rounded. 



This species is found with the Z. Davidsonü and Z. 

 Laboucherei. It is a thicker and more triangulär shell than 

 the former, and is devoid of the strise noticed on that shell. 

 In its triangulär and less syrametrical form it is to be 

 distinguished from Z. Laboucherei ; and it also wants the 

 concentric llnes on the valves characteristic of that species. 

 The shell structure of the genus is shown by the Z. oolitica 

 to be distinctly punctuate. 



Under the microscope the shell shows a number of 

 widely-separated, circular punctuations, which are arranged 

 in longitudinal lincs. 



Lept^na Davidsonii, Eug. Deslongchamps. 

 PL L, figs. 21, 22. 

 The figures representing the above species are taken 



