PISCES. 
203 
moderately compressed ; back low ; a fleshy keel midway between termina- 
tion of the dorsal and commencement of the caudal fin, on to which it is con- 
tinued for a short distance. Eyes veiled. A free bifurcated suborbital spine 
situated close to the lower margin of the orbit ; snout obtuse, no tubercle on 
end of lower jaw. Eight cirri, two on snout, four on superior maxillaries, 
and two on lower jaw. Nostrils simple. Dorsal fin arises opposite the ven- 
tral, in the centre of the bod 3 ^ The internal ray of the pectoral forming a 
large flattened spine, half the length of the soft raj'^s. Caudal emarginate. 
Scales over opercular and suborbital region. '^Pl. agrensis, sp. n., Daj'^, 1. e., 
OT Fish. Malabar, p. 204, pi. 14. fig. 2, from Cochin. 
CHARACINIDiE. 
Macrodon microlepis. It is probably this species which has been described 
by Kner and Steindachner under the name of M. hrasiUensis (Spix). AbhandL 
Bayr. Ak. Wiss. x. 1, p. 28. 
Saccodoji ivagncri is described by Kner and Steindachner, 1. c. p. 31, taf. 4, 
fig. 2. 
Tetragonopterus mneus has been found in the Chagres river. Kner and Stein- 
dachner, 1. c. p. 46. — T. mamlatm [?] is mentioned (ibid.) as inhabiting the 
Rio Bayano. 
Psmdochalceus linecdus is described by Kner and Steindachner, 1. c. p. 35, taf, 
5. fig. 1. 
Brycon atrocaudatus described by Kner and Steindachner, 1. c. p, 44, taf. 4. 
fig. 3 ; 
Chalcinopsis striafuhts is described by Kner and Steindachner, 1. c. p. 38, 
taf. 5. fig. 2 ; C. chagrensis, ibid. p. 42, taf. 5. fig. 3. 
'^Phago, g. n., Gunther, Ann. & Mag. Nat. Hist. 1865, xv. p. 209 ; the type 
of a distinct group, see Record Zool. Liter, i. p. 175. P. hricatus^ sp. n., 1. c, 
p. 210, pi. 5, from West Africa. 
j Cyprinodontid^. 
Cyprinodon ihencus and Fundidus hispanicits are described and figured by 
Steindachner, Sitzgsber. Ak. Wiss. Wien, 1865, Nov. 3. 
Ilaplochilus. Prof. Cope describes two new species, Proc^ Ac. Nat. Sc. 
Philad. 1865, p. 78, yiv^Fundulus aureus from Michigan, and Fundtdus seta- 
dicus from the Nebraska. ^ 
Ilaplochilus. The generic name Micristius has been proposed for H. zona- 
tus, cingulatus, and luci(c by Mr. Gill (Fish, of the Bay of Fundy). He adds 
that these species probably represent sexual conditions. 
Pseudoxiphophorus reticulatus is described as a new species by Troschel, in 
MUller, Wirbelth. Mex. p. 104, from Mexico. 
Rividus. Prof. Troschel has described two small Mexican Cyprinodonts 
under the names oT Gamhusia senilis (Girard) and* Gamhusia gracilis (Girard) j 
Muller, Wirbelth. Mex. pp. 106 & 107. He informs us that, on reexamining 
them, he thinks it probable that they belong either to Rimdus or Ilaplochilus. 
The specimens are not in a good state of preservation. 
Poecilia thermalis (Steindachner) appears to have .been described by Prof. 
