J. M. Clarke—New Devonian Crustacea. 121 
plete differences in the character of the faune of which it 
of the Portage rocks, Goniatites complanatus H., Colevlus acicu- 
lum H., Cardiola speciosa H., Lunulacardium ornatum H., Car- 
diomorpha (Paracyclas) suborbeularis H. In the bituminous 
shales of the “ Upper Black Band,” it appears with remains of 
the genus Paleoniscus and other undetermined fish relics, and 
also with an abundance of plant remains of doubtful affinities, 
spores of ferns or Lycopods, and with “Conodonts” and Anne- 
lidan teeth; in the Chemung in the lowest horizon with Leto- 
if we accept Newberry’s suggestion a deep-water, sub-sargossan 
May prove to be, abdominal segments, but I should hesitate to 
éscribe any as such. 
I have discovered another variation from the type of Spathio- 
carts in certain specimens taken from the shales and sandstones 
of the Chemung proper, at several localities, and in one, Cana- 
dice, Ontario Co., associated with Spathiocaris Emersonii, with 
Which it is allied in some points of the structure of the carapace. 
e differences are, however, very strongly defined and generic, 
48 will be readily seen from this diagnosis of the genus. 
Diprerocaris (dixrepog=two-winged, xapic= a prawn). 
_ Carapace in one piece, elongate, divided along the major axis 
‘to two more or less separated wings or ale. Greatest width 
anteriorly through the apex or area of union of the ale of the 
®arapace. These ale approach each other in planes which, 
normally, make an angle of about 120°, but the area of union 
18 not acute but rounded. Ale united medially for a distance 
equal to 4d or 4th the length of the carapace, in this union the 
ale anchylosed and without hingement of any kind. Clefts 
. Jour. Scr.—Turep Szrims, Vou. XXV, No. 146.—Fesrvakry, 1883. 
9 
