OXYSTOMA (mACRURA), SCHIZOPODA. 
Crust, 26 
Sergestid^. 
Lucifer typus (M.-Edw.) described from specimens taken at night with 
the hand-net near Fort Wool, Virginia, by W. Faxon, Chesapeake Zool. 
Laborat. 1878, pp. 113-119, pi. vii. 
SCHIZOPODA. 
Nebaliid^. 
A. S. Packard (supra, in Classification) considers this family as a 
distinct order, to be called Phyllocarida, which is the forerunner of 
Decapoda, being represented by some gigantic forms as Dithrocaris, 
over a foot long, in the Silurian period, and remarkable by a combina- 
tion of Copepod, Phyllopod, and Decapod characteristics. 
Nehalia longicornis, sp. n., Thomson, Ann. N. H. (5) iv. pp. 418 & 419, 
pi. xix. figs. 7-9, Dunedin, New Zealand. 
Mysid.®. 
The ultimate and penultimate segments of the more or less numero isly 
segmented thoracic feet are homologous with the dactylus and propodus 
of the Carides, and the additional segments all result from segmentation 
of the carpus. S. I. Smith, Tr. Conn. Ac. v. p. 96, footnote. 
Boreomysis, 4 spp., Siriella, 1 sp., Leptomysis, 2 spp., Hemimysis, 1 sp., 
Mysis, 10 spp., Mysidella, 2 spp., Parerythrops, 2 spp., Pseudomma, 1 sp., 
and Mysideis, 1 sp., all from Norway, accurately described and figured 
by G. O. Sars, Mysid. iii. 131 pp. 31 pis. 
Mysis stenolepis (S. I. Smith), New England. The young appear in 
early summer, come to maturity early in the winter, produce young from 
midwinter to spring, and all the mature individuals disappear before the 
second summer, the males disappearing long before the females. Smith, 
1. c. p. 105. 
Heteromysis (S. I. Smith, 1874) = Chiromysis (G. O. Sars, 1877) ; H, 
formosa (S. I. Smith) closely allied to, but distinct from the Mediter- 
ranean species, Vineyard Sound, hidden inside dead bivalve shells, 6-10 
fath. Id. 1. c. pp. 101 & 102. ' 
Meterythrops, g. n. Body very short, posterior cephalothoracic segments 
almost completely covered above by the carapace ; eyes well developed ; 
antennulse, antennae, oral and cephalothoracic appendages nearly as in 
Parerythrops ; pleopods in the female rudimentary, in the male well 
developed; inner branch in the first pair, however, rudimentary, its 
terminal part membranaceous and nearly naked ; ovigerous pouch as in 
Mysis. M. rohusta, sp. n., id. 1. c. pp. 93-98, pi. xii. figs. 1 & 2, Massa- 
chusetts Bay and Gulf of St. Lawrence, 33 & 70 fath. 
Pseudomma truncatum, sp. n., id. 1. c. p. 99, pi. xii. figs. 3 & 4, Gulf of 
St. Lawrence. 
1879. [voL. XVI.] 
B 18 
