Synopsis of the Genera of Fossil Phyllopoda. 463 
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Geological a) & ke 
> GENERA. Special character. wn sve 
Stage. og aay 
Gadel || eS cade: 
° a ooe 
68 om 
| Zi wal en 
(II.) FotpEp SxHiELp, bent along the back (like Nebalia), so as to form two 
side-flaps or attached valves. 
lige Hymenocaris, Salter, 1853..... ......... Smoother sey eee 8or9| 6 
flags. 1. 4 
Silurian.2. Dietyocaris, Salter, 1860 ............. cel) dASMEGU EVES), ccosserecrcecceccececet Gham won 
Silurian.3. ? (‘ Cytheropsis testis,’) Barr., 1872 
Uppermost 
Devonian | 
or Lowest > ? Protacaris, Baily, 1872.............. (Not well known.) 
Carbon- | 
iferous. 4. J 
II. Carnapace, BrvanvE; Vauves HInceED. 
(1.} Pop-LixE. 
Arenig and 
Lingula- 1. Caryocaris, Salter, 1862 .......... Pod-like, smooth. .......... — | 38? 
flags. _..... 
Tremadoc, 
Silurian, 
and 2. Ceratiocaris, M‘Coy, 1849 ..... Subovate, suboblong, | 5, 6, 
foe | CLON ern oem eumaaas: or7 | 3 
(America) 
Silurian. 3. Physocaris, Salter, 1860 .......... Round) a ee 5 or 6? 
ee \4. Colpocaris, Meek, 1872.............| Subovate, strongly 
erous...... + 
emarginate at one 
end (posterior). .........) — 3 
Devonian. 5. Echinocaris, Whitfield, 1880 | Leperditioid. ................0. 4 
(spiny) 3 
Silurian. 6. Aristozoe, Barrande, 1868 ..... Geperditiotd ee 
Silurian. len Onozocs Wharr.a Sy Qe ane nen eperditioid se. 
Silurian. 8 (Callizoe, Barr., 1868.........%0-..:) lueperditioids 200.2. 
(II.) ConcuirErorpat ; probably enclosing all the abdominal segments. 
Tremadoc. 1. Lingulocaris, Salter, 1866 _..... Modioloid, and faintiy 
Carbon- ridged. 
iferous. 2. Solenocaris, Meek, 1872. .......... Long, and concentri- 
Lower ‘| cally marked. 
Silurian. 3. Solenocaris, Young, 1869.......... Oblong, and obliquely 
ridged, and concen- 
Silurian or trically marked. 
Devonian? 4. Myocaris, Salter, 1864..... ......... Quadraneular, and 
strongly ridged ob- 
Carbon- liquely. 
iferous.... 5. Leaiad, Jones, 1862 veces. Quadrangular, and 
strongly ribbed ob- 
liquely, and concen- 
trically marked. 
Silurian? ) 
Devonian. 
Carbon- 
iferous. 
ree 
Sen 46. Estheria, Rippel, 1838 ......... Like a bivalved mol- 
. luse, and concen- 
Jurassic. 
i } ed. 
Neocomian trically marked 
Tertiary ? | | 
Recent. J | | 
