of American Geologists and Naturalists. 107 
existence of a large crest in the males on the coronal and aso A 
region ; 3, in the form of the anterior and posterior nasal ori 
fices; 4, in the existence of a notch on the edge of the hard pal- 
a ate; 5, in the comparative length of the ulna and humerus ; 6, in 
~~ the ‘configuration of the pelvis; in noe two last peculiarities, it is 
. the most anthropoid of all the Oran 
te A full description of its external shnrhionit and habits was read, 
a: the facts i eren been carefully collected by Dr. Savage 
— in Afric 
Briifeseor a work 0 ‘the eae cans there have 
been several discussions rotates to the views offered in that 
work ; and at the last meeting of the asseintion in New oe 
when the subject was again brought forward, an argument w 
drawn from the supposed identity of the above named erilobinese 
___. A committee was then appointed to investigate the question, and 
pay a report is offered as the result. 
cimens submitted for aoe er are both imperfect, 
materials, to institute a rigid comparison bety tween them, or even 
to determine the —— of the latter. Moreover, th bite re eXx- 
sedi 
i fie following table presents the comparative reinietint afforded 
by the two specimens. 
escent A lobe widest ; lateral segments curved ns 
oS —Shield a smaller transverse segment ; breadth twice 
length; lobes equal in width; Jateral lobes approximately 
equilateral. 
_ Abdomen : lobes equal in width; Jateral segments transversely 
rectilinear. 
hibahiaceins here cited are deemed sufficient to establish two 
Species of trilobites upon the specimens under examination, the 
point which the Association desired to have ocr and 
a on now ‘offered is correct, Atops trilineatus remains a 
steristic of the strata investigated and named by Prof. 
