PISCES. 
195 
tinge at tlieir base. The greatest depth of the body, as compared to the en- 
tire length of the fish, is about one to four. The scales are rather large. 
The head constitutes a little less than a fourth of the total length. The caudal 
fin is posteriorly rounded off, and the ventrals are long and pointed. — Sand- 
wich Islands. 
Th.ysanoclieilus, g. n., Kner, Denkschr. Ak. Wiss. Wien, xxiv. Ambo labia 
margine fimbriato, dentes acuti uuiseriales supra et infra, in ossis intermaxil- 
laris medio 4, inframaxillaris 2 dentes canini, 2 quoque supra ad oris angulum; 
caput totum, labiis exceptis, squamis minutis tectum, necnon guttur penitus 
clausum ad isthmum usque ; trunci squama3 magnse, oblongse, linea lateralis 
continua simplex, pin. ventrales in filum prolongatse, caudalis rotundata. — Th. 
oi-natus, sp. n., Kner, 1. c. taf. 3. fig. 1. D. A. L. lat. 28, From 
the Navigator Islands. • ^ 
Oorts lineolata is described by Kner, who adopts it as the type of Ophthal- 
mokpis. Novara, Fisch. p. 258, taf. 11. fig. 1. 
M. Guichenot has published a descriptive catalogue of the 
Scaroid fishes contained in the Paris Museum. The reexamina- 
tion of the specimens which served as types for the descriptions 
of Valenciennes was a great desideratum, and M. Guichenot de- 
serves much credit for having undertaken this task. In the 
Scaridce, which he adopts as a distinct family from the Labridody 
he distinguishes two groups, Scaroids proper and Odacoids.' He 
adopts the four genera of the former group established by 
Bleeker, but adds Hoplognathiis (Richards.), which is not a 
Pharyngognath. The Odacoid genera are the same as those dis- 
tinguished by the Recorder, except Siphonognathus ^ with which 
the author is apparently unacquainted. He describes 13 species 
of Scarits, 4 of hcariclithys, 47 of Pseudoscarus, 7 oi' Callyodon, 
1 of Pseudodaw, 3 of Odaw, 1 of Coridodaw. He adheres strictly 
to the species as distinguished by V alenciennes ; and although 
these species are now much better known through M. GuichenoPs 
descriptions than through the original ones given by Valen- 
ciennes, the better acquaintance with their characters contributes 
still more to the conviction that many of those formerly con- 
sidered dubious on account of their insufficient descriptions are, 
in fact, merely nominal species. We have lately had oj)portuni- 
ties for determining a number of Scaroid fishes, in which task 
we have been much assisted by M. GuichenoFs memoir, and we 
have met with the most satisfactory evidence that the coloration 
of these fishes varies according to sex, age, and season, and that 
even the colour of the jaws cannot always be depended upon. 
Thus, although we demur to adopt all the species of the Paris 
Museum as such, we are much indebted to M. Guichenot for 
having supplied us with descriptions of the typical specimens in 
which due regard is paid to those characters of structure w hich 
had been entirely neglected by Valenciennes. Two new species 
are described in this memoir. 
o 2 
