ot 
_ Sides of the body, and forms a sort of hem; below 
the central portion of the tail it makes a short acute 
projection, which seems to be supported by a short 
costal elongation of the middle lobe. Length two 
_ Inches and a half. 
The A. Micrurus was found in the black fetid 
limestone of Trenton Falls, by M. H.-Webster, Esq., 
_ and by him placed in the rich collection of trilobites 
in the Albany Institute. The limestone in which 
this Asaph is embedded, is almost one entire mass of 
petrifactions. The general aspect of the A. Micru- 
rus is very similar to that of a calymene—but jude- 
ing from its structure, it could never contract its 
shell into a spherical figure. Its minute tail, and 
narrow membranaceous expansion round the terminal 
edges of the lateral lobes are quite peculiar, and de- 
termine it to be an Asaph. 
: Soniuluye 
Asapuus Weerererrert.* Green. Cast No. 20. 
& 
Clypeo postice arcuato, sulcatos; abdominis articu- 
lis duodecim; cauda vix membranacea; cute corea- 
cea vixX punctata. 
The contour of this beautiful Asaph is very regu- 
larly ovate; unlike most of the remains of this genus, 
the buckler is still attached to the abdomen, though 
* I have named this species in compliment to my friend, John 
P. Wetherill, Esq., whose magnificent cabinet of fossils in the 
Academy of Natural Sciences of Philadelphia, will ever remain 
as a monument of his discrimination, enterprise, and liberality. 
- y, 9 
sf Z 
é YVYL ‘i _e - v 4 a \ F as Khe 
- 2 4 - Fa, 
A * ie ee Me i o# peg : 
f ¥ i f- { pe Soin , t 2 ss rae are j 4 A, 
Pert? ts why ie Se {z. te "P Vy FO lane pO & . 
