276 
AETHPwODIEA. 
Germs COBTCHOPOMA, Kner. 
TSitzungsb. math.-naturw. Cl. k. Akad. Wiss. vol. lvii. Ib6b, pt. i. 
p. 279.] 
Head relatively large and opercular apparatus robust, tbe oper¬ 
culum convex and shaped like the valve of a bivalve shell; dental 
plates covered with irregularly arranged, stout, conical or rounded 
tubercles. Trunk elongate and laterally compressed; median fin 
continuous. Scales small, delicate, striated. 
Conchopoma gadiforme, Kner. 
1844. CcelacantJius munsteri , L. Agassiz, Poiss. 
Foss. vol. ii. pt. ii. 
p. 173 (undefined). 
1868. Conchopomci gadiforme, R. Kner, Sitzungsb. math.-naturw. Cl. 
k. Akad. Wiss. vol. lvii. pt. i. p. 278, pis. i.-iv. 
Type. Well-preserved fishes : Museums of Berlin and Strassburg. 
The type and only known species, of small size. Length of head 
with opercular apparatus about equal to the maximum depth of the 
trunk, and contained about four times in the total length. 
Form. Sf Loc. Lower Permian : Rhenish Prussia. 
P. 507, P. 3336. Xodule with nearly complete fish, wanting the 
margins of the median fin and the paired fins, intended to 
be the type specimen of Coelacanthus muensteri, Ag.; 
Lebach. EycTton Enn-tsJczllsn Colls . 
ir*, 
Hr 
' Order II. ARTHRODIRA. 
Head with well-developed dermal or membrane bones; principal 
v^. ^ upper dentition on the elements of the pterygo-palatine arch. 
^ I cj*’ ' Dermal armour of abdominal region consisting of large plates, of 
J> ~ ; which a dorso-lateral pair articulate by a movable ginglymoid joint 
'J A ' ,LC rf with the occipital border of the cranial shield. Kotochord per- 
fj. sistent. Paired fins rudimentary or absent; pelvic basipterygia [so 
^ - r c far as known] consisting of a pair of sigmoidal or club-shaped carti- 
/ V* $ plages. 
< J' F" a single family, that of Coccosteidse, can be referred to this 
* order with certainty ; but two other imperfectly known families 
iaW -) & (Asterosteidae and Mylostomatidse) may also be placed here with 
V 
much probability of correctness. 
4 u 
