1877.) 49 [Cope. 
inner border of the spiracle. A row ofa few spines between the orbit and 
the lateral free border, nearer the latter ; six or eight on the median line of 
the middle portion of the back ; a double row parallel to the border of the 
pectoral fin, extending an inch within it, on its anterior half only ; a series 
on the median line of the tail. i 
M. 
Motalen eth. - 1. arte rehsteterve Weeivereiwiere niece squcnoadaeac B07 
SOM RCRD elo ar ah dale a'sh0;e's, s(arsrdi ll o Waa: «6. )514 Byoeigie mipieioies 27 
Length to mouth....... Seip, eget Pesan n star sore skcraeiot aleve arereroree 038 
$3 Seen CHM ener tatevercralersis(oraicte toler ails ialeteint etait oye:ofoveronstel wists 190 
+ See ABEL Ol, tall foyer oe) 6« ates steaiay si srete oxavelsefens exe . 215 
Ex MMSC LOM VEIMULML. 111Ge arersys)afeiercsc:oisleleyors: eieieve ecaterensl asters Se gl 
Tian Or Tbe Sw ROLLY 6 e556 ete < 15 oe aha oss) c/dienct'syo1c sis) o o\e-evsieitelele, fet te 029 
Upper surfaces lead colored with indistinct darker shades ; middle of the 
anterior portion of the muzzle pale, with a dark spot behind it. 
From the Bay of Pacasmayo, Peru. 
On the Brain of Procamelus Oceidentalis. 
By E. D. Cope. 
(Read before the American Philosophical Society, May 4, 1877.) 
I obtained a complete cast of the cranial chamber of the Procamelus 
occidentalis, which bears a fair proportion to the general dimensions of the 
skull. As compared with a llama of about the same size, the facial por- 
tion of the skull is longer, while the postorbital portion is as long, but 
narrower. This is indicated by the following measurements : 
Procamelus Auchenia 
occidentalis, lama. 
Length of skull anterior to orbit............ .180 158 
of «« posterior SMart y as ofctastchs Ae eal) 105 
Width ** at anterior border of orbit.... .080 .990 
2 sf middle of zygomatic fossa.. .062 065 
The olfactory lobes of the brain have nearly the same position in the 
two species, extending anteriorly to opposite the middle of the orbits. 
The brain exhibits large cerebellum and hemispheres, and rather small 
olfactory lobes. The cerebellum is entirely uncovered by the hemispheres 
but is in contact with them. The lateral lobes and vermis are well devel- 
oped. The hemispheres are well convoluted, the longitudinal posterior con- 
volutions giving way anteriorly to lobulate ones. The sylvian fissure is 
well marked. The sides of the medulla oblongata are compressed and 
vertical at the pons, in correspondence with the vertical position of the 
petrous bones. The origins of the ophthalmic and maxillary branches of 
the trigeminus nerve are not divided by a septum, while that of the man- 
PROC. AMER. PHILOS. soc. xvil. 100. G 
