- 
Marcu 7, 1884. | 
earnest scientific work which he had done and 
was doing was appreciated; and in 1876 he 
was elected a member of the National academy 
of sciences. He had long been a member of 
other learned societies, and was widely known 
and respected among scientific men. 
In person, Gen. Warren was of medium 
height, and slightly built. His mind was in- 
tensely active. Nervous in temperament, and 
sometimes irritated at trifling annoyances, he 
became instantly cool and self-poised in times 
of real danger or difficulty. In close logical 
reasoning he had few superiors. His mental 
habits were those of an investigator, — never 
satisfied until he had studied the matter in 
hand in all its bearings; but in action he was 
impetuous, indomitable, and gallant in the ex- 
treme. His reading was extensive, both in 
science and literature, —due largely to his habit 
of seeking mental rest by working in a new 
direction. His sense of humor was keen, and 
his conversation was often brilliant as well as 
instructive. In disposition he was kindly and 
sympathetic, and he never failed to give others 
full credit for whatever good work they had 
done. He loved justice for its own sake; and 
the natural tendency of his mind was always 
to assist the weak, and to strive to redress 
wrongs wherever found. ‘These traits of char- 
acter endeared him to his friends; and his 
memory is cherished with mingled feelings of 
respect and regard, not easy to express. 
Henry L. Appor. 
APPENDAGES OF THE TRILOBITE. 
TurovueH the kindness of Mr. D. A. McCord, 
the owner of the trilobite described by Professor 
John Mickleborough (Cine. journ. nat. hist., vi. 
200, 1883), I have had an opportunity to study 
the original specimen, and prepare a few notes 
upon it. 
When received, the specimens —i.e., matrix 
and relief — were not free from the grease and 
dirt acquired in the process of taking casts 
and frequent handling. On giving them a 
thorough washing in a solution of potash, this 
was removed, and also a thin film of decom- 
posed rock on the parts beneath the pygidium. 
Turning to the laboratory window, to have the 
sunlight strike across the specimens while still 
wet, much to my surprise, the appendages 
shown beneath the pygidium were seen to be 
of the same character as those beneath the 
thorax, a number showing in some instances 
two and three joints attached to the basal 
joint. On a more careful examination, numer- 
ous fine slender filaments were discovered, both 
SCIENCE. 
279 
beneath the thorax and pygidium, and also 
near the posterior end of the latter slender 
jointed appendages not half a millimetre in 
diameter. Having cut up over two thousand 
trilobites without discovering any ‘ branchi- 
gerous’ appendages beneath the pygidium, 
other than the spiral and ribbon-like branchial 
filaments, — such as were attached to the basal 
joints of the thoracic legs, — naturalists can 
appreciate the feeling of satisfaction that the 
discovery of these jointed appendages, so much 
like those found in cutting sections of Ceraurus 
and Calymene, gave the writer. 
The breaking-apart of the surfaces carry- 
ing the legs and their matrix left the legs be- 
neath the thorax in relief; but beneath the 
pygidium the joints were broken longitudinally, 
and only a plain outline section is seen. It is 
probably owing to this that these were over- 
looked by Professor Mickleborough, and the 
space beneath the pygidium considered as show- 
ing leaf-like or foliaceous appendages. For the 
purpose of clearly indicating the actual rela- 
tions of the portion of the Ohio trilobite showing 
the legs, to the entire dorsal shell of the same 
species, a figure of the under side of the shell 
was outlined ; and then the Ohio specimen was 
carefully drawn as if resting in it, as shown in 
fig. 1. In the specimens, some of the appen- 
dages are shown more distinctly in the matrix, 
and others in the relief. In the drawing, the 
two are combined so as to give, without restora- 
tion, what is actually present in the specimens. 
Twenty-six pairs of appendages are clearly dis- 
cernible. Of these, nine are situated beneath 
the thorax, one beneath the posterior margin 
of the head, and sixteen beneath the pygidium. 
From the character of the appendages beneath 
the thorax, none of them appear to have be- 
longed to the manducatory apparatus ; the ninth 
posterior pair having been crowded forward from 
beneath the pygidium. The anterior pair be- 
neath the head is very imperfect ; but sufficient 
remains to show that these appendages were in- 
timately associated with the cavity of the head, 
which is now filled with calcite, and they proba- 
bly represent a portion of the posterior pair of 
manducatory appendages. In Calymene se- 
naria and Ceraurus pleurexanthemus, the pos- 
terior pair of manducatory appendages are 
always provided with a large basal joint, and 
undoubtedly the same was the case with other 
genera of trilobites. The appendages beneath 
the pygidium are, however, of the greatest in- 
terest. I have seen many trilobites, when cut- 
ting sections, that had the cephalic and thoracic 
legs clearly and distinctly defined ; but, owing 
to the small size of the pygidium of Calymene 
