88 
Septa :* the upper surface is smooth, with a slight sul- 
cus along the middle and a stria on each side of it; how 
it terminates is at present unknown. 
This species is considered in the French Encyclopedia, 
where it is figured, as perfect at the perforated end, and 
although Mr. Meade and others have kindly lent me their 
best and most complete specimens, I have never seenone 
nearly perfect. The larger figure is about the sizeof Mr. 
Meade’s largest specimen. Mr. Cumberland, indeed, 
considered it a new Genus and named it Lyra Meadi, in 
compliment to our worthy friend, whom I esteem so 
much, but the term Lyra is so apt I could not resist 
applying it to the specific name. The analogy of many 
species of similar construction, although not so much 
elongated, show that it cannot, with propriety, at pre- 
sent be separated from the perforated and plaited Tere- 
bratule, for want of distinguishing characters, (although 
they may hereafter be divided) till those further removed, 
being imperforate, are more settled. 
I found some specimens in the green sand at Chute 
Farm, near Horningsham, chiefly silicized. 
# I have observed indications of similar septa in the beaks of some 
Spirifers. 
