25 Pisces. 
PISCES. 
separate caudal ; eye externally not visible, reduced to a minute rudi- 
ment hidden below the skin ; bands of villiform teeth in the jaws on the 
vomer and palatine bones ; barbel none ; ventrals reduced to simple 
filaments placed close together on the humeral symphysis ; gill-openings 
very wide, the gill-membranes being but slightly united in front ; gills 
four, gill-laminae rather short, gill-rakers of moderate length ; scales thin, 
deciduous, small. T. nasus, sp. n., Gunther, c. p. 21, N. E. Australia. 
Aphyonus, g. n. Head, body, and tapering tail strongly compressed, 
enveloped in a thin, scaleless, loose skin ; vent far behind the pectoral ; 
snout swollen, projecting beyond the mouth, which is wide ; no teeth in 
the upper jaw, small conical teeth in the lower, pluriserial in front and 
uniserial on the side ; vomer with a few rudimentary teeth ; palatine 
teeth ; nostrils close together, small ; no externally visible eye ; barbel 
none ; ventrals reduced to simple filaments, close together and near 
humeral symphysis ; gill-membranes not united ; four branchial arches, 
the posterior without gill-laminae, the anterior with very short gill- 
rakers and with rather short gill-laminae ; head covered with a system of 
wide muciferous channels and sinuses, the dermal bones being almost 
membranaceous, whilst the others are in a semicartilaginous condition ; 
notochord persistent, but with a superficial indication of the vertebral 
segments (as in some Leptocephaline forms). A. gelatinosuSj sp. n., 
id. 1. c. p. 22, N.E. Australia and New Guinea. 
Siremho messieri, sp. n., id. 1. c. p. 19, Messier Strait. 
Macrurid^. 
Macrurus longirostris, p. 23, N.E. of New Zealand, holotrachys, p. 24, 
East of Rio Plata, fasoiatus, p. 24, West of extremity of S. America ; 
Gunther, 1. c. : spp. nn. j 
Coryphcenoides rudis, p. 24, Pacific, cequalis, p. 25, Portugal, crassiceps, 
p. 25, Pacific, mici'olepis, p. 26, Feejee, murrayi and serrulatus^ p. 2^, New 
Zealand,'^ p. 27, .Antarctic, variabilis, p. 27, Pacific, &g.j affinis, 
p. 27, East of Rio Plata,'' carinatus^ p. 28, Prince Edward’s Island ; 
id. 1. c. : spp. nn. 
Pleu^onectid^. 
Agassiz, A. On the Young Stages of Osseous Fishes. II. Development 
of the Flounders. Pr. Am. Ac. xiv. pp. 25, 8 pis. 
Describes the changes through which young flounders pass after their 
escape from the egg, and before they finally assume the adult appear- 
ances and rest on the colourless side. The development is traced in five 
of the common species. 
r STEENSTRUP, J. Fortsatte Bidrag til en rigtig opfattelse af Oiestillingen 
hos Flyndrene. Overs. Dan. Selsk. 1876 (1877), pp. 174-247, 
/ pis. i.-iv. 
I On the position of the eyes in the Pleuronectidce ; continued from the 
I n.uthor’s investigations of the same subject in November, 1863. See also 
/ Naturf. 1878, No. 38, p. 353. 
