‘the shell beneath the posterior portions of the lateral 
lobe.. The inferior structure and mechanism of this ‘ 
part of the fossil trilobite, is thus, we believe, for the — 
first time developed. Ina fine group of the Dudley 
fossils deposited in the cabinet of the Geological So- — 
ciety of Pennsylvania, a similar inferior reflected: 
edge may be seen beneath the buckler of the Asaphus 
Debuchii. It is not uncommon in many of the recent 
Crustace Rand 3 is strikingly exhibited — the lower | 
edge of the Limulus polyhemus. 
The Asaphus Myrmecophorus was found in a hard | 
ash coloured carbonate of lime in Genesee County, 
N. Y., by Mr. J. C. G. Kennedy, and was ahem 
by him to the Philadelphia Museum. = 
The perfect animal, the fossilized 
which is above described, must have bee 
inches in length, which is much longer than any 
Asaph we have ever seen. Indeed, it -is conte bit 
doubtful whether it be a true Asaph or not. Although — 
there appears to have been no membranaceous de- 
velopment extending beyond the abdominal arches, 
still its depressed form, and the relative proportions 
of the middle lobe, seem to place it among the Asaphs. 
_ Asarnus? Cryrrurus.* Green. Cast No. 41. | 
- Cauda acuta; articulis terminalibus obscuris ; parte 
_. =» marginali vix membranacea; corpore convexo, = 
a tolerably perfect fragment of the abdomen ‘an 
es 
-* The Greek for “concealed tail.” 
