ON THE FOSSIL PHYLLOPODA OF THE PALOZOIC ROCKS. 217 
Synopsis of the Genera of the Fossil Phyllopods—continued. 
EE EE eee 
No. of | 
No. of | Caudal 
exposed] SP1nes 
a Genera Special character ie Styles 
and 
seg- : 
stylets 
ments ose 
telson 
(IL.) FoLDED SHIELD, bent along the back (like Webalia), so as to form two 
side-flaps or attached valves. 
Lingula- 
flags 1. Hymenocaris, Salter, 1853 .| Smooth . ‘ .| Sor 9 6 
Silurian 2. Dictyocaris, Salter, 1860 . | Reticulate : .|° 672 at 
Silurian 3. 2? (¢ Cytheropsis testis,) Barr., 
Uppermost 1872. 
Devonian 
or Lowest 
Carboni- 
ferous . 4. ? Protacaris, Baily, 1872 . | (Not well known) 
II. Carapace Brvatve; Vatves HIncep. 
(1.) PoD-LIKE, 
Arenig and 
Lingula- 1. Caryocaris, Salter, 1862 . . | Pod-like, smooth po By 
flags J : 
Tremadoc, 
, oo 2. Ceratiocaris, M‘Coy, 1849 . | Subovate, suboblong, | 5, 6, 
ae &e or 7 3 
(America). 7 ‘ , ; 
Silurian . 3. Physocavris, Salter, 1860 . > |: Round? "*, . . |5or6? 
‘|Carboni- 
ferous , 4. Colpocaris, Meek,1872 . .|Subovate, strongly 
emarginate at one 
end (posterior) .| — 3 
Devonian . 5. Echinocaris, Whitfield, 1880 .| Leperditioid . ‘ 4 
(spiny)| 3 
Silurian , 6. Avistozoe, Barrande, 1868 . | Leperditioid 
Silurian , 7. Ovrozoc, Barr., 1872 . : . | Leperditioid 
Silurian . 8. Callizoe, Barr., 1868 : . | Leperditioid 
(II.) CoNCHIFEROIDAL ; probably enclosing all the abdominal segments. 
jTremadoc . 1..Lingulocaris, Salter, 1866 . | Modioloidand faintly 
| Carboni- ridged. 
ferous . 2. Solenocaris, Meek, 1872 . . | Long and concentric- 
ally marked. 
L. Silurian. 3. Solenocaris, Young, 1869 . | Oblong,and obliquely 
HEE ridged and concen- 
Silurian or, trically marked. 
Devonian? 4. Myocaris, Salter, 1864 . . | Quadrangular and 
! strongly ridged 
Carboni- obliquely. 
ferous . 5, Leaia, Jones, 1862 . 3 .| Quadrangular and 
Silurian ? strongly ribbed 
Devonian obliquely, and con- | 
Carboni- centrically marked. | 
ferous | 
emg Be Estheria, Riippel, 1838 . . | Like a bivalved mol- 
Jurassic lusc, and concen- 
Redeomian trically marked. 
Tertiary ? 
Recent J 
