658 , ARTHROPODA SUB-KINGDOM VII 
Family 1. Discinocaridae. Woodward. 
Test convex, sometimes mesially ridged ; in a single piece. 
Discinocaris, Woodw. Shield sub-cireular, rostral notch and rostrum angular. 
Abdominal segments and caudal spines have been referred to this 
genus by Jones and Woodward. Silurian; Great Britain, 
Bohemia. 
Aspidocaris, Reuss. Similar to Discinocaris.  Raibl Beds 
(Trias) ; Hallstadt. 
Dipterocaris, Clarke (Fig. 1378). Shield with a deep posterior 
notch, shorter than the anterior or rostral notch. Sides of shield 
sloping. Silurian; Scotland. Upper Devonian ; New York. 

Fic. 1378. 
Dipterocaris vetustus, Family 2. Peltocaridae. Salter. 
d’Arch. and Vern. De- . F 
vonian ; Hifel. 1/;. Shields mesially sutured. 
Peltocaris, Salter. Circular shields with a rounded rostral notch and _ plate. 
Abdomen unknown. Ordovician; Great Britain. 
Aptychopsis, Barr. (Fig. 1379). Like Peltocaris, but with the 
rostral notch angular. Silurian; Bohemia and Great Britain. 
Pinnocaris, Etheridge. Similar to Dzpterocaris, but bivalved. 
Ordovician ; Scotland. . (P. Lapworth, Etheridge jun.) 

Fic. 1379. 
Addendum. Aptychopsis primus, 
Barr. Ordovician (D); 
A number of generic names, such as Cardiocaris (Fig. 1380), (aitar Heese “A 
Ellipsocaris, Pholadocaris, Woodward, and Spathiocaris, Clarke, 
have been applied to Devonian fossils which closely resemble the Silurian Diseinocaris, 
of whose Crustacean nature there seems to be no doubt. Some of 
these bodies, however (Cardiocaris), have been found in the living 
chamber of Goniatites (G. imtwmescens), and have undoubtedly 
served as opercula or aptychi of these Cephalopods; of others 
the nature is not fully understood. Lisgocaris, Clarke, is not a 
Crustacean ; Cryptocaris, Barrande, is probably the operculum of 
a Hyolithoid; Myocaris, Salter, is stated to be a Pelecypod ; 
Proricaris, Baily, was founded on parts of Ceratiocaris ; Crescen- 
tilla and Pterocaris, Barrande, are doubtfully Crustacean. 

Fic. 1380. 
Cardiocaris  (Anapty- [The authorship of the foregoing chapters on Phyllopoda, Cirripedia 
chus?) Roemeri, Woodw. pg as Il fl el li a : ’ 
Upper Devonian; and Phyllocarida, as well as the succeeding one on the Acerata (Mero- 
Biidesheim, Eifel. 1/;. stomata), should be accredited to Dr. John M. Clarke, New York State 
Palaeontologist. A number of additional figures for illustrating these 
sections have also been prepared by him expressly for this work, or borrowed from his 
previous writings. —TRANS. ] 
Order 2. SCHIZOPODA. Latreille.! 
Small, elongated, aquatic Malacostraca with compound eyes borne on movable stalks, 
and w large delicate carapace covering the thoracic segments more or less completely ; with 
1 Literature : 
Jordan, H., and Meyer, H. v., Crustaceen der Steinkohlenformation von Saarbriicken (Palaeontogr., 
IV.), 1856.—Salter, J. W., Higher Crustacea from British Coal Measures (Quar. Journ. Geol. Soe., 
XVII.), 1861.—Ztheridge, R., Occurrence of Anthrapalaemon in Carboniferous of Scotland (ibid. 
XXXIII.), 1877.— Whitfield, R. P., New Crustacea from the Devonian of Ohio (Amer. Journ, Sci, 
[3], XIX.), 1880. Also in Ann. N.Y. Acad. Sci., V., 1891.—Peach, B. V., New Crustacea from the 
Carboniferous of Eskdale (Trans. Roy. Soc., Edinburgh, XXX., pp. 78, 512), 1880.—Brocchi, P., 
Note sur un Crustacé, ete. (Bull. Soc. Geol. France [3], VIII.), 1880.—Packard, A. S., On the 

