63 
The same author also remarks, Die Urwelt Russlands, 1840, p. 22: 
“T found also in Odinsholm fragments of other species, viz: Calymmene 
variolaris Brong. (at that date both 4. punctatus and £. variolarzs were 
Classed under the name of C. vartolaris), which belongs to the genus 
Cryptonymus. * * * JI discovered near Reval an interesting small 
Species of Cryptonymus, which has a tail similar to Ca/ymmene punctata, 
Dalm. 
Hmmerich, Zur Naturgesch. der ‘T'rilobiten, 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: 
_ “Eyes smooth, the glabella inflated and club shaped, the tail with many 
Yinged axis and few pleurae. 
“FE. 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 naime.”’ 
The author includes 2. punctatus and two of Portlock’s species, 
Ampbhion multi-segmentatus and Ogygia rugosa. 
This description, like that of Eichwald, only points out its type. 
Almost all the authors on ‘T'rilobites have used it, with the exception of 
Angelin, Richwald 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- 
nae in a long caudal spine or blunt point with 9-ro plurae, such as— 
Enerinurus punctatus Brunn, Ordovician and Silurian of Norway, Swe- 
den and England, 
ee VES Hell ie ese Silurian of New York. 
Pee CEE OMMOCHINICG iid ile Ordovician of Russia. 
—Schisticola SLOUMOQUISt civics lei en Ordovician of Sweden. 
Be OURS ELA) iiss seiaseersGvec eur ies cris eu Silurian of New York. 
De -SMACOSt ATA SHIUi isis icici divisesivess Ordovician, North Wales, &c., &c. 
And the genus Cryptonymus for Kichwald’s second type Z. variolaris 
3rong., in which the genal angles of the head are not prolonged into 
S i . -TA s 4° “ . en! 4 
Pines, ‘Ihe pygidium has few axial joints and few pleurae. Such as— 
Encrinurus variolaris BIOORG iicectiar rr ayererts Silurian of England. 
ee Dated FeSWell ics ice .... Pentland Hills, England, 
Oe PONE FA OT ones. ccs sens ecasieev te tases ies Reg. E Sweden. 
—— laevis ATU GI Gece cia hie iersie se Reg. D Sweden. 
—— Bowningi ORES TG i i ect ies Silurian, Australia. 
——Indianensis Kindle Silurian, Indiana, 
Under whi i | 
Inder which we have included the species described under the genus 
Cromus Barrande, 
