124 J. M. Clarke—New Devonian Crustacea. 
. 4 represents the specimen natural size from which this 
poaaes is described. Fig. 5, the same, enlarged 4 diameters. 
The genera Spathiocaris ‘and Lisgocaris, which have been 
described by myself in this Journal as noticed above, show, 
neither of them, any evidence of a dorsal suture in the carapace. 
At the time of. my description of the genus Spathiocaris, the 
existence of this suture seemed a matter of considerable doubt, 
along a median line. More abundant material, however, places 
beyond a doubt the absence of any hingement, and the fact 
that the carapace is in one piece. The genus Lisgocaris was 
then proposed to cover a species differing from Spathiocaris as 
then apprehended, in the undoubted absence of this suture, and 
though rather an aberrant form from the type of the genus 
Spathiocaris, I think it wise, in the light of the additional ma- 
terial obtained, to abolish the name erected for it, and to 
include it under the genus Spathiocaris, the species there 
described to be Sp. Lutheri. With my present cance ptidt of 
these genera, I should not expect to find (though ee; and 
careful search has been made) any traces of a “rostrum” or 
free valve to cover the single cleft in Spathiocaris, as it fom in 
the genera Discinocaris Woodward and Peltocaris Salter, which 
are allied to Spathiocaris in some of the grosser features, or to 
cover the cephalic cleft in D¢plerocaris. In sarge the 
cleft seems to be posterior and for the protrusion of the 
men. In Dipterocaris I am inclined to believe, for lack of any 
evidence to the contrary, that both clefis were uncovered and 
allowed the protrusion of the cephalic appendages as well as 
the abdominal somites 
e statement of the absence of the hingement, or the dorsal 
suture, in Dipterocaris, depends on these observations : 
1. There is no mar upon the carapace evincing such a 
suture 
2. One example of D. Procne, having the entire carapace 10 
its normal position, has been subjected to peel from above 
by accumulating sediment, in just such a manner as would be 
most likely to separate the carapace along a "dared suture if 
any existed, but instead of such separation the carapace has 
yielded in concentric wrinkles parallel to its margin 
3. Another example of the same species, flattened in a thin 
laminated sandstone, has been broken across the area between 
the apices of the anterior and posterior clefts, and in such 4 
way as to have been left with a ragged edge. 
Mr. hitfield, in this Journal for Jan., 1880 (vol. xis; 
No. 109, p. 33, “Notice of New Forms of Fossil Crustaceans 
from the Upper Devonian Rocks of Ohio,”) has presented a 
synopsis of the Ceratiocaride based upon features ey the ‘“cara- 
