104 
PISCES. 
is for protection or whether a part of the auditory apparatus/^ 
he comes to the following conclusions : — 
“ That the necessity for this bony capsule to the air-vessel is greater in 
India and Burmah than in the Malay archipelago. 
‘‘That this protection is for the freshwater and not for the marine 
Siluroids. 
“ That no true Indian, wholly marine Siluroid has its air-vessel enclosed 
in bone. 
“ That amongst the Siluroids of the hilly regions, those which ascend 
rivers having alpine som’ces have the air-vessel enclosed in bone. 
“ That those which ascend rivers not snow-fed do not appear of necessity 
to have their air-vessels thus protected.” 
Copidoylanis hrevidorsalis. Prof. Troschel having received a female without 
ventral tins, regards their absence as a sexual character in this species, which 
peculiarity, he thinks, is evidence in favour of maintaining the genus Neosi- 
lurm. Wiegm. Arch. 1871, pp. 276-280. [Having examined several spe- 
cimens of this species, the Recorder is inclined to consider the apodal spe- 
cimen examined by Prof. Troschel a case of individual monstrosity, as he has 
seen it also in ErythrinuSf OphiocephahtS) &c.] 
Callichrous egertmii^ sp. n.. Day, P. Z. S. 1871, p. 710, Punjab. 
AiliichihySy g. n.. Day, P. Z. S. 1871, p. 712. Difters from Ailia by the 
absence of ventral fins. — Ailiichthys punctatay sp. n.. Day, 1. c. p. 713, Jumna. 
Pseudeutropiua longimanm (Gthr.) and Hypophthalmus taakree (Sykes), 
Day, P. Z. S. 1871, p. 636, and Gunther, ibid. p. 762. 
Maoi'ones nangra (II. B.) is described by Day, P. Z. S. 1871, p. 288 j 
Maci'oties carcio (II. B.), ibid. p. 705 ; Maci'ones imgara and tenganaj 
p. 706. 
Macrones vittatus (Bl.)=Ra^ms omlatus{G. .) — Bagrus montanuSy &c. 
(Jerd.) = ilfacrowes armatus (Day), according to Day, P. Z. S. 1871, p. 706. 
Macrones menoda (J{, T^.^^Bagrus trachacanthus (0. & V.), according to 
Day, 1. c. 
Akysis kurziiy sp. n.. Day, P. Z. S. 1871, p. 703, Pegu. 
Olyra. Mr. Day characterizes this genus, and describes as a new species 
Olyra burmanicuy P. Z. S. 1871, p. 711. 
Amiurus. Prof. Cope makes remarks on the species recognized by him, 
and describes as new A. mispilliemisy A. lopkiuSy and A. niveivetitris. P. Am. 
Phil. Soc. 1870, pp. 485-489. 
Pimelodus. Pseudm'hamdia piscatrix and Rhamdia cyanostigmay spp. nn.. 
Cope, 1. c. p. 669, from Pebas. 
Glyptosternum telchitla (H. B.) described by Day, P. Z. S. 1871, p. 288. 
Olyptosternum modesturny sp. n.. Day, 1. c. p. 714, Jumna. 
ITara elongatay sp. n., Day, P. Z. S. 1871, p. 704, Garrow Hills. 
^ Doras pectmifronsy sp. n., Cope, P. Am. Phil. Soc. 1870, p. 668, Pebas. 
Arges and Stygogenes. Phnelodus cyclopum (Humb.) = Arges brachycephalus 
{(Mhx.^ — Stygogeyies humboldtii (Gthr.), according to Putnam, Amer. Nat. 
1871, V. p. 694. [Induced by the remarks made by Mr. Putnam, the Re- 
corder has reexamined the typical specimens of the two latter species, espe- 
cially with regard to the presence of a hard spine in the adipose fin of Arges. 
In an example 4 inches long no such spine can be found under the skin. 
Consequently, if Mr. Putnam’s supposition is correct notwithstanding, we 
