206 Miscellanies. 
sea voyage, and had not been bottled up for weeks. Prince Albert was 
at Lord Northampton’s soiree on Saturday, and I showed him many fossil 
teeth and bones and infusoria with the microscope. Prof. Owen, who 
has been following up his odontography, that is, microscopical examina- 
tion of fossil teeth, has discovered a remarkable structure in the large 
conical teeth of Jaeggar’s Mastodonsaurus—the calcigerous tubes—the 
medullary or pulp canals, and the dentine are distributed in the most in- 
tricate and labyrinthine manner you can conceive; and in consequence, 
Mr. Owen has named the animal the Labyrinthedon. A part of the skull 
has been found in Warwickshire, in the red sandstone, and although but 
a fragment, presents anatomical characters which prove the original to 
have belonged to the Batrachian family, and not to the Saurians.. He be- 
lieves - that it is to some reptile of this kind that the impressions (the. so 
called Chirotherium) on the red sandstone, are to be attributed. The 
sedtionsof mak teeth are made in the same manner as those of fossil 
2 as figured and described by Mr. Witham; and they present 
the most. hesintifak objects imaginable; but you will doubtless see Mr. 
Owen’ s book, in which they are admirably represented. - Mr. Owen’s me- 
moirs, whether he be right or wrong in ascribing the foot-marks of the 
oa sandstone to the reptiles that Jaegger describes as Mast 
are admirable essays on a most interesting department of alcoontalit 
You will be delighted with his beautiful elucidation of the form and struc 
ture of the original animals from a new fragment of the upper jaw a 
few teeth. He has, perhaps prematurely, given-a restoration of the 
rinthodon, representing it as a Batrachian, with a head like a crocodile. 
“Ross and Powell are the two rival opticians. whose microscopes sare 
in demand. From ten to forty or fifty guineas is the price of the best.” ~ 
Another correspondent* says, “I have one which, in its simple form, 
has cost me eighteen guineas, and will cost’fifty to complete it. I learn 
‘that they are made much cheaper at Berlin and at Paris, where Mr. 
Donne has constructed a very good one for thirty-six francs.” © 
The correspondent first named, adds: “‘ Fossil infusoria in: flint are’ 
now greatly in vogue, particularly Xanthidia, like those figured in Man- 
tell’s Wonders of Geology. You have them living in the water at West. 
Point. But Ehrenberg’s grand folio work has induced an active search 
after living a animalcules, and my son ie my tore in a stream wae us, 
almost every form figured by Ehrenberg.” | 
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