TA 
© gradually tapers towards the abdomen. The cheeks 
form spherical triangles, and are entirely destitute of 
oculiferous tubercles or any other markings; their 
posterior angles project beyond the sides of the ab- 
domen. Abdomen and tail very much compressed, 
and composed of about ten articulations; costal arches 
of the lateral lobes grooved; tail attenuated. Whole 
length half an inch. | 
The Cryptolithus Tessellatus, resembles a good 
deal the Entomostracites Granulatus of Wahlenberg, 
and which Dr. Dalman calls Asaphus Granulatus. 
The figure of this animal given by Brongniart, table 
3, fig. 7, appears to be quite imperfect, and is very un- 
like, except in the buckler, the representation of 
Wahlenberg’s fossil, given by Dalman, table 2, fig. 
6. Though the angles of the buckler in the Asaphus 
Granulatus are much more elongated than those of 
the C. Tessellatus, it may perhaps be another species 
of the same genus.* 
* The following, is Dr. Dalman’ s description of the Ania 
Granulatus :— 
A. trunco sexarticulato pygidioque levibus, capite antice se- 
micirculari margine ene) angulis posticis extensis corpore 
longioribus. | 7 
Animalculum singulare, inversum si inspicitur, lyram forma 
fere similans. Caput antice semicirculare, margine distincto, 
serie submoniliformi e granulis approximatis ornato, discus capitis 
levis, sed ambitus intra Arginem punctis elevatis obsitus. Hic _ 
ambitus, una cum margine, truncum quoque amplecti es ad 
pygidii basin usque, ubi in cornua levia, trunco multo longi 
abit. Glabella antice fere claveformis, ad basin utrinque 
tens lobi rudimentum. Truncus brevis levis segmentis constan: 
