CRUSTACEA. 
27 
Phacops Cacapona. 
PLATE vm, FIGS. J9-24. 
CalymeJie bufo, Castblnau. Essai sur le Syst. Sil. de I’Amer. Sept., p. 21, pi. ii, tig-s. 1-4. 1848. 
Phacops Cacapona, Hall. Descr. New Species of Fossils, etc., p. (58. 1861. 
Phacops Cacapona, Hall. Fifteenth Kept. N. Y. State Cab. Nat. Hist., p. 96. 1862. 
Phacops Cacapona, Hall. Illustrations of Devonian Fossils, pi. viii, figs. 18-23. 1876. 
The two specimens from which this species was originally described are inte¬ 
rior and somewhat imperfect casts of enrolled individuals, retaining very few of 
the features which are essential in determining the value of closely allied species 
of this genus. In general proportions they resemble Phacops rana as that fossil 
appears in the limestone layers of the Hamilton group, except that the glabella is 
more protuberant and the glabellar furrows more strongly marked, and in these 
features it approximates Phacops cristata. Whether the species belongs to either of 
these two, or is valid in itself, cannot be definitively determined without the ac¬ 
quisition of specimens retaining the test, the genal extremities and the pygidium. 
The specimens described and figured by Castelnau (/oc. a7.)as Calymene bufo, Green, 
were from the same locality as the type specimens of Phacops Cacapona. This author’s 
figures do not, however, assist in determining the specific value of his examples. 
Distribution. Hamilton group. Mouth of the Cacapon River, near its junc¬ 
tion with the Potomac, Virginia. 
Phacops nupera. 
PLATE vm, FIG. 27. 
Galy7nene nupara, Hall. Geology of N. Y. Survey Fourth Geol. Dist., p. 262, fig. 116. 1843. 
Phacops nupera. Hall. Illustrations of Devonian Fossils, pi. viii, fig. 26. 1876. 
The type specimen of this species was found during the progress of the geo¬ 
logical survey of the State in a loose block of sandstone, apparently of the age of 
the Chemung sandstones, near the' mouth of Chemung Creek, in Chemung county. 
No other specimen is known to have been found since, and this is not satisfactorily 
preserved for purposes of identification. In all apparent features it agrees with 
Phacops rana of the Hamilton group, but the critical characters for distinguishing 
the Devonian Phacopes, viz.; the genal extremities, the cephalic doublure and 
the pygidium, are not retained, and it is consequently impossible to determine 
its specific value. The original designation is, therefore, retained, awaiting the 
acquisition of material which may serve either to establish or discard it. 
Distribution. Chemung group. Chemung Creek, Chemung county. 
