Pisces. 1 
PISCES. 
BY 
A. W. B. O'Shaughnessy. 
Anatomy and Physiology. 
Beauregard, H. Recherclies sur les reseaux vascalaires de la 
chambre posterieure de Poeil des Vertebr^. Ann. Sci. Nat. (6) iv. 
Art. i. 
[In Fishes, pp. 87-119, pi. v.] 
Jaeger, J. Ueber die Funktion der Kiemenspalten. Wiirtt. nat. JH. 
1876, pp. 96-99. 
Fritscii, G-. Ueber den feinoren Ban des Fischgohirnes. MB. Ak. 
Berl. 1876, pp. 26-29. ^ 
Moreau, A. Reclierches experimentales sur Jles fonctions de la vessie. 
natatoire. Ann. Sci. Nat. (6) iv. Art. ix. 86 pp. pis. xiii. & xiv. 
Tomes, C. On the development of the Teeth of Fishes {Elasmo- 
hranchii and Teleostei). Phil. Tr. clxvi. pp. 267-268, pi. xxxi. 
f A. W. Malm describes and figures cases of hermaphroditism in Scomber 
(^and Cluped) ; OEfv. Ak. Forh. 1876, pi. v. 
^ Ricci, on the form and structure of the stomach of fishes; Rend. 
V Acc. Nap. August, 1876. 
, ' Heincke, on change of colours in fishes, especially in Syngnathus and 
( Gohius ; Schr, Yer. Schlesw.-Holst. i. p. 266. 
Classification. 
I T. H. Huxley draws up the following scheme of the morphology of 
the Ichthy op sida, based upon the characters of the skull, the nature of 
the olfactory and respiratory organs, and the development or non- 
development of an opercular fold of the integument : -r- 
I. Holocrania. — A. Amphirrhina : a. Pneumatoccela — 1. Operculata ; 
( 2. Inoperculata. b. Apneumatoccela—1. Operculata; 2. Inoperculata. 
