V2S2 
THE VOYAGE OF U.M.S. CHALLENGER. 
Cylhere acantfioderma. 
„ dasijflernia. 
„ dietyon. 
Ct/nHsoma gfdnoifum. 
Acatdfiejihtrra »ica. 
Gennadas parvus. 
Difaxaria ahyssicola. 
The following 12 species (or 19 per 
ami 500 fathoms ; — 
Bathyactis symmetrica. 
Oph iomast us teguUti ns. 
Pourtalesia laguncula. 
Cythere dasyderma. 
„ dictyon. 
Boreomysis ohlusata. 
Buyxda reticulata. 
Crihrilina monoceros. 
Chauliodus sloanii. 
Gonostoma microdon. 
Nemichthys infans. 
Stemoptyx diaphana. 
cent.) were taken in tlie zone between 100 
Acanthephyra sica. 
Gennadas parvus. 
Area (Scapharca) inxquisculpta. 
Biiyula reticulata. 
Cribnlina monoceros. 
Gonostoma microdon. 
Thus four species {Cythere dasyderma, Acanthephyra sica, Bugida reticulata, and 
Gonostoma microdon) were taken in all the zones, except the shallow- water zone less than 
100 fathoms. 
The following 8 species (or 12 per cent.) were taken in depths less than 100 fathoms 
or at the surface : — 
Bathyactis symmetrica. 
Laetmonice producta. 
Cythere dictyon. 
ly-pas anatifera. 
Gennadas parvus (surface). 
Crihrilina monoceros. 
Astronesthes niger (surface). 
Stemoptyx diaphana (surface). 
Thus three species {Bathyactis symmetrica, Cythere dictyon, and Gennadas parvus) 
occur iu all the zones of dej^th from the surface or shallow water to over 2500 fathoms. 
Of the 9G species taken only in this zone beyond 2500 fathoms, 85 species (or 89 per 
cent.) are new, and the following 9 new genera were obtained only in this zone of depth : — 
Stannarium ( 2 ). 
Il'jaloftyluf. 
Trachycaulus. 
Antheomorphe. 
Ilalisiplumia. 
rsycheotrephes. 
Scotoanassa. 
Pctalophthahnus. 
Mixonus. 
These genera are each represented by a single species taken at a single station, except 
the genus Strtnnarium, which contains two species, each taken at a different Station 
inside this zone. 
y»otrs on thr (rcofjraphical Distribution. — An examination of the foregoing list shows 
that of the 161 s]>ccics taken in this zone beyond 2500 fathoms, 87 species (or 54 per 
