132 ARTHRODIRAN LUNG-FISHES 
an analogy afterward supported by Newberry, Dean, and 
recently, on account of the similar characters of the sen- 
sory canals, by Pollard. In their conclusions, however, 
fundamental characters of structure seem to have been 
overlooked in the unlikeness of Arthrodiran to Tele- 
ostome. The inner structure of the cranium of Arthro- 
FIG. 131 
Figs. 131, 132. — Coccosteus decipiens, Dorsal view of dermal armouring, x b= 
(After TRAQUAIR.) 132, Ventral plates. (After TRAQUAIR.) ‘ 
ADL. Antero-dorso-lateral. AZ. Anterolateral. AVM. Autereeseeuiene 
Cc. Central. £. Ethmoid. ZO. Epiotic. JZ. Inferior lateral. 4. Marginal, 
MC. Mucous canals. MD. Median dorsal. .4/O, Median occipital, A/V. Me- — 
dian ventral, O. Opercular. PDL. Postero-dorso-lateral, PZ. Posterior lateral, — 
PM. Premaxillary. PN. Pineal. PO. Preorbital ZO. Postorbital PVZ. — 
Postero-ventro-lateral. SO. Suborbital. ' 
dira was evidently entirely cartilaginous; in a Russian — 
Coccosteid, according to Smith Woodward, the base of the — 
brain case (parachordal cartilages) has been preserved and — 
shows a “tubular canal originally occupied by the anterior — 
