63 
The same author also remarks, Die Urwelt Russlands, 1840, p. 22: 
“TJ found also in Odinsholm fragments of other species, viz: Calymmene 
variolaris Brong. (at that date both £. punctatus and F. variolaris were 
classed under the name of C. variolarzs), which belongs to the genus 
Cryptonymus. * * * I discovered near Reval an interesting small 
species of Cryptonymus, which has a tail similar to Calymmene punctata, 
Dalm. 
Emmerich, Zur Naturgesch. der Trilobiten, 1844, p. 16, gives the 
following description of his new genus Encrinurus. The name was taken 
from the resemblance of the tail to a Crinoid stem., Der schwan and 
Encrinites: 
‘* Byes smooth, the glabella inflated and club shaped, the tail with many 
ringed axis and few pleurae. 
‘“\E, punctatus Wahl. is so different from all other trilobites that it is 
entitled to form a separate genus; it unites the clavate glabella of the Asaphus, 
and has the facial suture and eyes like Calymmene. * * On account of its 
peculiar shaped pygidium, I have given it the above name.’ 
The author includes 4. punctatus and two of Portlock’s species, 
Amphion multi-segmentatus and Ogygia rugosa. 
This description, like that of Eichwald, only points out its type. 
Almost all the authors on Trilobites have used it, with the exception of 
Angelin, Eichwald and Vogdes. 
To retain both genera Emmrich’s Encrinurus might be used for 
E. punctatus for a group of species having the genal angles of the head 
produced into spines, the pygidium, with a many jointed axis, termin- 
ating in a long caudal spine or blunt point with g-ro plurae, such as— 
Encrinurus punctatus Brunn, Ordovician and Silurian of Norway, Swe- 
den and England. 
Mi OAS ETalllll oso o sepa sere sere cekssleiiemiersies chasm nine Silurian of New York. 
Seebachites GlimitGiteee -eeesartemrechica: teieecnctecei suse Ordovician of Russia. 
SOU GIGOLA, ANG HAG PORIS{E 6500 coscones. opaassenncscHees Ordovician of Sweden. 
OMA SHE Val ei asejacateteiaeneierac chetgecis iisioassevetecicentsslonaihs Silurian of New York. 
Bex COSta tay Oa liteecssmeysesclcecnelecerce Ordovician, North Wales, &c., &c. 
And the genus Cryptonymus for Kichwald’s second type &. variolaris 
Brong., in which the genal angles of the head are not prolonged into 
spines. ‘The pygidium has few axial joints and few pleurae. Such as— 
MUCOUS VaALlOlaTS IBLOM See scence. eee auieea sec ne ance Silurian of England. 
SxauanSamelaSwiellleensecreeeenccceerse eeeaeee ens Pentland Hills, England, 
OMEUSU SWAG S Slitting cetera tas che vices scatiseretar esis siege at crerteinnro as Reg. E Sweden. 
NLCNG Swett le Miide Serre crescent vis Sseitnde mecnecnc ates Se seeises deerece Reg. D Sweden. 
BOWMAN TOS MSIWS sc cneade nedddeaen rane de aeoscenAnsaa sacs Silurian, Australia. 
Igrelniamvena Sise erin GE 5 a Satrie acs crocacesee aeeccie ete entero ¢ vesieyearer Silurian, Indiana. 
Under which we have included the species described under the genus 
Cromus Barrande. 
