1893. | NEW YORK ACADEMY OF SCIENCES. 239 
Columbia College, and Prof. Kemp very kindly has given me 
the privilege of describing them. 
The trilobites are found in a soft, fine, black shale, and are 
very perfectly preserved. The most noticeable character about 
them is the presence of long, many-jointed, rod-like attach- 
ments to the front of the head, which resemble exactly the 
antenne of other crustaceans. These come out close together 
from just under the centre of the anterior border of the head- 
shield, and diverge generally at an angle of 30° or 40°. In one 
specimen (Fig. 1), a length considerably exceeding that of the 
glabella is shown* ; in the rest, they are more broken, but a 
considerable length is preserved in three or four, and the 
stumps are distinctly seen in upwards of twenty others. They 
curve slightly outward and taper graduaily down towards the 
end ; the tip itself is not preserved. These antennze are com- 
posed of a great number of joints, each of which is conical, 
about half as long as wide, and smallest at the base of the joint. 
(See Fig. 1*.) As preserved, they are calcareous, but ap- 
parently of a structure less firm and thick than the substance of 
the carapace. Their point of origin appears to be under the 
front of the glabella, as they can be traced a little way under 
the head-shield, where they almost coalesce, then diverge and 
disappear ; no joints are distinguishable in this part. (See 
Fig. 2.) Just over where they come out, the anterior rim is 
arched slightly upward, seemingly to give room for their play 
to and fro. 
These organs must certainly belong to the trilobite ; when 
attached, they are in all cases in exactly the same position, 
and are but rarely to be seen separate ; moreover, in a number 
of specimens in which they were not shown, they were developed 
by cutting away the matrix in the proper place. Their character 
seems also tolerably certain, as both in position and structure 
they are like the antenne of modern crustaceans, The appear- 
ance of the right hand antenna in Fig. 3, may indicate that 
these organs could be bent back under the sides of the shield— 
but this point needs more evidence. 
Besides these, there are shown in several of the specimens, 
other appendages, some of which may be branchial in their 
character, and others, walking orswimming legs. In Fig. 1, the 
side of the head shield has been broken away, exposing the 
appendages, apparently of three cephalic segments. These are 
of two kinds, one of which seems to be a narrow, jointed, 
* Mr. Valiant has since shown me a specimen which has antenne one anda 
half times as longas the glabella. He informs me that there are now about 
sixty specimens showing antennie.—J une, 1893. 
