"ie~ng. 
~3TTT 
spp. n., 
Germany, 
Berlin 19 ; 
tf 
■fPholldosteus laevior p. 
pygmaeus p. 16 pi* 1 dg- ” 
friedeli figd., Devonian 
Gross Geol. palaont. Abh. 
P. compact us sp. n. Devonian Germany, 
Jaekel Mon. Geol. Pal. 3 1929 text-fig. -OCCOSTEID.®* 
83 
j.iagments of the shield of an undetermined species of Phlyctcm- 
aspis , with an ornamentation much resembling that of P. anglica , 
have also been discovered in the Lower Devonian of .Russian Poland 
( Coccosteus y A. von Alth, Abhandl. k. k. geol, Reichsanst. vol. vii, 
pt. i. 1874, p. 38, pi. iii. figs. 16-21). 
Genus CHELYOPHORUS, Agassiz. 
[Poiss. Loss. Y. G. R. 1845, p. 135.] 
Dorsal shield arched from side to side ; scutes ornamented with 
granulations, more or less elongated, confluent, and often arranged 
in sinuous or vermiculating lines; neural and haemal arches well 
calcified, and the caudal region destitute of armour. Elements of 
cranial shield not fused in the adult, and the occipital bones consti¬ 
tuting less than half of its length ; orbits forming broad notches r 
not bounded externally ; a median pineal foramen; parachordal 
cartilage ossified; [jaws unknown]. Dermal armour of trunk pro- 
bablv as in Coccosteus. 
%/ 
This genus comprises species of small or moderate size, and does 
not appear to be represented in the Collection. The finest specimen 
hitherto described is the imperfect head and trunk of C. primigenius 
in the University of St. Petersburg ; this showing one of the support¬ 
ing cartilages of the dorsal fin, interpreted by Eichwald as a dorsal 
fin-spine. There is no certain evidence of paired appendages. 
Several detached plates have been described and figured by Pander 
(Placoderm. devon. Syst. p. 86, pi. vii. figs. 3, 9-15, 31), and com¬ 
pared with the corresponding plates of other genera ; and the follow¬ 
ing species are recognized :— 
Chelyophorusprimigenius, E. von Eichwald, Leth. Rossica, vol, L 
(1860), p. 1525, pi. lvii. figs. 1-3.—Devonian ; Govt, of 
Orel. [Imperfect skeleton ; University of St. Peters¬ 
burg.] 
Chelyophorus verneuili, L. Agassiz, Poiss. Loss. Y. G. R. (1845), 
p. 135, pi. xxxi. a. figs. 14-19 ; G. Eischer de Waldheim, 
Bull. Soc. Imp. Nat. Moscou, vol. xxv. (1852), pt. i. p. 172, 
pi. ii. figs. 1-5; E. von Eichwald, Leth. Rossica, vol. i. 
(1860), p. 1529; C. EL Pander, Placoderm. devon. Syst. 
(1857), p. 96 ; H. Trautschold, Zeitschr. deutsch. geol. 
Ges. vol. xli. (1889), p. 46, pi. vi. figs. 3-6.—Devonian ; 
Govt, of Orel and Livonia. [The type species, founded on 
detached plates.]<£^^.73 ^7 
( ~ cTP^ / ) 
& 
