GANOIDEI. 
Pisces 10 
SalenskY, W. Embryologie der Ganoiden. Zool. Anz. i. pp. 243-245, 
266-269, 288-291. 
1. Impregnation and cleavage of the egg of the Sterlet. 
2. Development of the skeleton in the Sterlet. 
j Wilder, B. On the Respiration of Amia. P. Am. Ass. 1878, pp. 306- 
[ 313. 
/ 
C Lankester, E. R. Notice of a Memoir on the Hearts of Ceratodus^ Proto- 
pteruSy and (Jhimcera. P. Z. S. 1878, p. 634. 
i Miall, L. Monograph of the Sirenoid and Crossopterygian Ganoids ; 
1 Ceratodus. Pal. Soc. xxxii. pp. 1-32, pis. i. i.A, 2-5. 
The object of this memoir is to present collectively the materials of 
knowledge respecting the Ganoids both recent and fossil ; the present 
part gives the different species of Ceratodus in order. 
f C. Hasse has sketched the following as a natural system of classifica- 
tion of the Elasmohranchii : — 
Subclass. Elasmohranchii A spondyli. 
Order 1. Holocephali, 
Order 2. Plagiostomi Cyclospondyli. 
Suborder i. Plagiostomi Asterospondyli. 
Group 1. Scyllia. 
Families. Chiloscylliurn. 
Mustelus. 
Hemigaleus. 
(Subfamily, Galeus\ Genus, CfctrcAanas.) 
Group 2. Scyllio-Lamnidce. 
I Families. Lamna. 
I (Genus, Selache.) 
Ginglymostorna. 
j Group 3. Acrodonti. 
I Family. Cestracion. 
I Suborder ii. Spinaces. 
Group 1. Lmmargi. 
Family. Scymnus. 
Group 2. Spinacidce. 
Group 3. Echinorrhini. 
Suborder iii. Plagiostomi Tectospondyli. 
Group 1. Pristiophoridce. 
Families. Squatina. 
Squatinoraia. 
Group 2. Trygones. 
Families. Trygon. 
Myliobates. 
Group 3. Maice. 
Family. Torpedo. 
Zool. Anz. i. pp. 144-148, 167-171. 
