9 Pisces, 
PISCES. 
V^- 
PALiBIOHTHYBS. 
Hasse, C. Die fossilen Wirbel. Morphologische Studien aus dem ana- 
tomischen Institut zu Breslau. Die Oestracionten. Morph. JB. iv. 
: pp. 214-268. pis. 3. 
. Ueber die Verwandtschaftsverhaltnisse der Gattung Selache. Op. 
cit. Supplt. pp. 43-68, 2 pis. 
On the developmental relations of Selache with Carcharodon, 
. [Note on the developmental relationship of Sharks and Rays] Ber. 
Vers. Naturw. 1878, pp. 173 & 174. 
On the excretory system of Ganoids. Fiirbringer, Morph. JB. iv. 
pp. 56-60. 
On that of the Dipnoi ; id. 1. c. p. 60. On that of the Plagiostomi\ id. 
/. c. pp. 49-56. 
^ GANOIDEI. 
Bkidge, T. On the Osteology of Polyodon folium, Phil. Trans, clxix. 
pp. 683-734, pis. Iv.-lvii. 
With'respect to classification, the author says that the facts elucidated 
in the earlier part of this paper abundantly justify adherence to H. 
Miiller’s two primary divisions of Ganoidei {Qhondroetei and Holostei), or 
to Liitken’s two groups of “ Ganoidei proper,” and “ Sturiones.'* The 
remarkable combination of Teleostean, Elasmobranch, and Amphibian 
characters in Polyodon and Acipenser^ if not justifying their elevation to 
a primary subdivision of the class, should be adequately expressed in 
any natural system. He considers that the true position of Polyodon is 
that of an annectant group between the Elasmobranchii on the one hand 
and the divergent stems of the Teleostei and Ganoidei on the other. The 
Ganoids may be classified as follows : — 
Ganoidei. 
A. Selachoidei. Pterygoid processes united in a median symphysis. 
. Persistent and unsegmented notochord. Persistent spiracles and 
mandibular branchim. 
Genera. — Polyodon, Acipenser, Scaphirrhynchus, and Chondrosteus. 
B. Teleosteoidei. Pterygoid processes not united with each other, but 
connected directly or indirectly through the intervention of a 
palatine bone with the prefrontal region of the cranium. Verte- 
bral column generally ossified into distinct vertebrae ; notochord 
aborted ; no mandibular branchiae. 
Genera. — Amia, Polypterus, Calamoichthys, and Lepidosteus. 
N^Comparison of the skull of Polyodon with the Amphibia, 724-731. 
Baukas, W. On a dental peculiarity of i\iQ Lepidosteidce. Tr. R. Soc. 
N. S. W. xi. pp. 203-207. 
