18 
beccuiiel on the buckler not reticulated; by the abdo- 
men with but 8 articulations. ie ane 4332 é 
a 
y 
From 4saphus. By the middle lobe, which is double t 
the size of the lateral ones; by the absence of a mem- 
branaceous expansion on the sides; oF the non- -reticu- a 
lation of the eyes, &c. 
From Ogygia. By the rolled form, the rounded 
posterior angles of the buckler, and the distinct arti- 
culation of the longitudinal lobes. 
From Paradoxide and Agnoste by cheracheoe too 
obvious to be enumerated. (See Annals of N. York 
Lyceum, &c. Vol. I. pp. 174-5.) 3 
In 1826, J. W. Dalman published in the Transac-_ 
tions of the Swedish Academy, and also ina separate 
work, an account of the trilobites found in the North 
of Europe, in which he has enriched the family by a 
number of fine species, and with the following genera, 
which he modestly proposes merely. as subdivisions. 
Genus Seventh. Ni.eus. 
Body short, capable of contraction into a sphere, 
smooth, convex. 
ihdoniee with about 8 serials ‘without any 
dorsal longitudinal furrows. 
Buckler sub-lunate, with large lateral eyes. — 
Tail expanded, not so large as the buckler, without 
lobes. Raat,” : 
Genus Bight, emer ao 
Bolly eens oblong , contractile, ie: det a ee ae 
