ae 8 
Sept. 18, 1873] 
NATURE 
401 
tenna with five teeth ; dorsal shield with the outer angles | 
of its posterior border produced into spines ; no posterior 
spine in the middle line ; length 142 mm. Of this species 
one specimen was taken from a depth of 2,200 fathoms, 
with a bottom of Globigerina ooze, at Station 69, 400 miles 
to the west of the Acores. 
G. zoéa, n. sp. (Fig. 6): Scale of the outer antenna 
Ie 
‘a 
\ 
} 
— a oa 
=f) 
Fic 4 
Fics. 4 & 5.—Gnathopha. sia gigas, vy. W.-S. 
there are characters presented by the new genus, particu- 
larly in connection with the dorsal shield, which not only 
entirely separate it from Lophogaster, but enlarge our 
views on the whole Schizopod group. In both species 
the shield is sculptured by ridges traversing it in different 
directions, and in both there is a long spiny rostrum ; 
but this shield is merely a soft duplicature of the skin, 
connected with the body only anteriorly, and leaving five 
thoracic segments entirely free. In the structure of the 
ee ee ee ed 
with one tooth. A long central spine on the posterior 
border of the dorsal shield, but no lateral spines ; length, 
60mm. A single specimen at the present station like- 
wise from a bottom of Globigerina ooze. 
On comparing the figures of these two species and of 
their anatomical details with that of Lophogaster given by 
Sars, one is struck by their great general similarity ; but - 
Fic 6 Fic, 5 
Fic, 6.—Gnathophansia zoea, v. W.-S. 
shield and its mode of attachment Grathophansia has the 
greatest resemblance to 4fws among all crustaceans, but 
it differs from it widely in all other respects. NVedalia is 
the only Schizopod in which the carapace is not con- 
nected with the posterior thoracic segments, but in that 
genus the form of the carapace is totally different, and the 
genera are otherwise im no way nearly related. 
Neither the antennz, nor the scales, nor the parts of 
the mouth present any marked differences from those of 
