ae Genus Tenth. Hasionvrrunes. ‘1G 
Body contractile. 
Buckler oculiferous and not tbat ibe are zim 
bdomen trilobate, with 8 articulations. Grohe 
Tail, costal arches covered, middle lobe naked. 
oat he asaphus expansus of Dalman, and several — 
other known species may be arranged under ‘this a 
genus. i. hae mC 
As Count Rasoumowsky has given no specific ap- 
pellation to the fossil above alluded to, we propose to 4 
call it after his own name, Hemicrupturus Rasoumow- 
skii. We examined the fine specimen from which | 
our cast is taken in the cabinet of the Baltimore Col- 
lege, and for this favour we are indebted to the. aes 
ness of Dr. J. J. Cohen, one of the Professors i in that 
rising institution. | ea be 
The following list includes all the genera and sper 
cies of the Trilobite Family, hitherto described as 
far as known to the author. It is taken from bes ng 
La Beche’s Manual of Geology.. Me mit | 
Bt Aa fi phn 
NAMES, AUTHORS, LOCALITIES. _ : 
Ait 
Calymene Blumenbachii, Al. Brong. _ asus | Se ey 
Macrophthalma, — do. 
Variolaris, do. 
Tristani, ooh he 
‘ Bellatula, Dalman. 
Ornata, — iui ta 
Verrucosa, ie oa 
: vr. i 
ah f id hs : Peers gouk 
Tae. ee j Ba 
