PACKARD.] THE ORDER PHYLLOCARIDA. A449 
Family NEBALIADA! Baird, 1850. 
With the characters of the order; the telson wanting. 
Genus NEBALIA Leach, 1815. 
With the characters of the family. Paranebalia has narrow gills. 
Nebalia bipes iiaaen Grénlands Amfipoder, 91; Kroyer’s Naturh. Tidskrift. 436, 1847. 
Cancer bipes O. Fabricius, Fauna Groenlandica, 246, fig. 2, 1870. 
Nebalia bipes Baird, Brit. Entomost. 1850. 
Monoculus rostratus Montagu, Linn. Trans. 1807. 
N. herbstii Leach, Zool. Misc. i, 100, Pl. 44, 1814. 
N. glabra Lamarck, An. S. Vert. v, 345, Bosc. 
N. ciliata Lamarck. 
N. montagui Thompson. 
Nebalia qeotfr oyi Edwards, Ann. Sc. Nat. 1828. (N. strausii Risso.) 
Nebalia longipes Willemes- Suhm, Trang Linn. Soc. London, 2d ser. vol. 1, 1875. Ber- 
muda. 
Paranebalia longipes Claus. (See’Carus’ Yahresbericht, 1880). 
Nebalia longicornis Thompson, Ann. & Mag. Nat. Hist., 1879, 418. New Zealand. 
We found in August, 1877, what is probably a fifth species, closely 
allied to NV. bipes, between tide-marks at Victoria, Vancouver’s Island, 
Brit. Columbia. The specimen was unfortunately lost. 
Family CERATIOCARID® Salter, 1860. 
Often gigantic forms, like Nebalia, but with a long, spine-like telson, 
which is “sometimes represented by a pair of spines. 
It is possible that the Nebaliade and Ceratiocaride phoulel rather 
stand as suborders; and that under the Ceratiocaride there are two 
families, one represented by Ceratiocaris and allies, and the other by 
Peltocaris. 
Salter states that the carapace of Dictyocaris slimoni from the upper 
and lower Ludlow Rock ‘‘frequently measured from 9 inches to a foot 
in length!” If so, then the entire length of the animal must have ap- 
proximated 2 feet; and he says the length of the largest Ceratiocaris 
yet known could not have been less than 15 inches. 
The following impertect synopsis of the fossil genera is taken, with 
some modifications, mainly from Salter; it begins with Hymenocaris, 
which Salter regarded as the oldest as well as most generalized type. 
(Compare Barrande’s account, Syst. Sil. vol. 1, 1872, p. 436.) 
Genus HYMENOCARIS. * 
The shield neither flat nor bivalved, but simply bent; and without 
any rostrum. A median number (6-7) of free abdominal segments; 
the body ending in 3 pairs of spines. Lingula flags or Primordial zone. 
Genus PELTOCARIS Salter, 1863. 
Only the carapace known, which is orbicular, with a median suture, 
and a deep, rounded rostrum? or piece whose front edge is continuous 
with the rounded front edge of the carapace. 
P. harknessi Salter, Journ. Geol. Soc, 1863. Llandeilo flags. 
P. aptychoides Salter, 1. C.D. Ode 
29 H 
