Description of several new Trilobites. 343, 
Arr. XVIII — Description of Several New Trilobites ; bie 
acos Green, M. 
Genus Cry pheus—Gireen. 
Body ovate oblong ; convex ; ieilotate; contractile. 
Buckler with two reticulated, oculiform tubercles. 
Arches of the lateral lobes sustaining a second series of ribs. 
Tail elongated, membranaceous, lobate. 
The generic term which we have applied to this proposed group 
of animal remains, is derived from the Greek, and is analogous in 
its signification to that of Calymene, Asaphus, Ogygia, and to some 
other appellations used by fossil zoologists. The head and the up- 
per part of the body of these animals resemble those of the Caly- 
mene of Broneniart. A very slight obliteration of these fossils 
along the sides and round the tail, would give them all the characters 
of a Calymene, and perhaps some animals which have been described 
as belonging to that genus, will be found hereafter to belong to the 
present group. The genus Crypheus is also, in some respects, 
very closely allied to Paradoxides, but as the duckler is furnished 
with tubercular oculiferous prominences, they cannot be confounded 
together. Professor Bronentart has indeed described, with a 
mark of doubt, the Paradoxides Laciniatus, as having eyes—oculis 
marginalibus? but should that interesting relique ever be discovered 
in a sufficiently perfect state to determine the question, it cannot, 
we suppose, be included in a genus, one of the principal characters 
of which is to be blind. Bronentarr says of this group, ‘“ Les 
lobes latéraux (of the buckler) sons unis, et ne paraissent point porter 
d’yeux réels ni méme de protubérances oculiformes.” The P. 
Laciniatus is furnished with a lobate tail, somewhat like that of the 
Crypheus, but it differs in many important particulars from any fossil 
that we have ever observed. Mr. De La Beche does not include 
it under that name in his list of Trilobites discovered in Europe, 
though according to WauLENBERG, it is found in Westrogotbia. 
Professor Bronen1art, has given, from Mr. Sroxes, an imperfect 
drawing of a trilobite sometimes met with at Dudley in England, 
(plate 4, fig. 9.) which has some analogy in its form to the animals 
proposed to be arranged in our new genus, and Count Rasoumov- 
s«y has figured and described a very remarkable relique, found on 
the Yaousa, near Moscow, which also has a somewhat similar aspect. 
