PACKAKD.] THE OEDEE PHYLLOCAEIDA. 449 



Fauiily NEBALIADiE Baird, 1850. 

 Witli tlie characters of the order 5 the telsou wanting. 



Genus Netbalia Leach, 1815. 

 "With the characters of the family. Paranebalia has narrow gills. 



Xeialia hipes Kroyer, Gronlands Amfipoder, 91; Kroyer's Natnrli. Tidskrift. 436, 1847. 

 Cancer bipes O. Fabricius, Fauna Groenlaudica, 246. fig. 2, 1870. 

 Nebalia bij^es Baird, Brit. Entomost. 1850. 

 Monocnlus icostratus Montagu, Linn. Trans. 1807. 

 N. herbstii Leach, Zool. Misc. i, 100, PI. 44, 1814. 

 N. glabra Lamarclj, An. S. Vert, v, 345, Bosc. 

 N. ciliata Lamarck. 

 N. montagui Thompson. 



Nehalia (jeoffroyi Edwards, Ann. Sc. Nat. 1828. {N. strausli Eisso.) 

 Nihalia Jong'ipes WillemoesSuhm, Trana. Linn. Soc. London, 2d ser. vol. 1, 1875. Ber- 

 muda. 

 Paranebalia longipes Glaus. (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 N. Mpes, between tide-marks at Victoria, Vancouver's Island, 

 Brit. Columbia. The specimen was unfortunately lost. 



Family CEEATIOOAEID^ Salter, 1860. 



Often gigantic forms, like Nebalia, but with a long, spine-like telsou, 

 which is sometimes represented by a pair of spines. 



It is possible that the jSTebaliadse and Ceratiocaridse should rather 

 stand as suborders; and that under the Ceratiocaridse there are two 

 families, one represented by Ceratiocaris and allies, and the other by 

 Peltocaris. 



Salter states that the carapace of Dietyocaris slimoni from the uj^per 

 and lower Ludlow Kock "frequently measured Irom 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 Eymenocaris, 

 which Salter regarded as the oldest as well as most generalized type. 

 (Compare Barrande's account, Syst. Sil. vol. 1, 1872, p. 436.) 



Genus Hymenocaeis. 



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 Peltocaeis 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. harlcnessi Salter, Joum. Geol. Soc. 1863. Llandeilo flags. 

 P. ajptychoides Salter, 1. c. p. 87. 



29 H 



