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COCCOSTEIDJE. 
303 
(1889), p. 133, pi. ii. figs. 3, 4, pi. iii. figs. 1-5, pi. iv. 
fig. 3.—Cleveland Shale ; Ohio. [Head, &c.; Columbia 
College, Hew York.] 
V/cri 
Genus BSACH,OPE i TA.XsIC13*FS2YSj Norwood & Owen. 
[Amer. Journ. Sci. [2] vol. i. 1846, p. 371.] 
Syn. Physichthys, H. von Meyer, PalaeontogT. vol. iv. 1855, p. 80. AsfTAr+ iC&L*) 
Agassichthys, J. S. Newberry, Bull. National Institute, 1857, fe S.*- 
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p. fr£? ( 
Cranial shield much arched from side to side, superficially orna- 
mented with stellate tubercles ; sensory canals forming large tubular 
excavations in the bone, opening at the external surface by a con- V'V 
tinuous narrow slit. Elements of cranial shield fused together in ^ ^ 
the adult; orbits completely surrounded; parachordal cartilages 
ossified; [jaws unknown]. 
In the description of this genus by Newberry \ the sensory canals 
are regarded as “ double sutures,” and the arrangement of the bones 
still remains to be determined. 
There are no remains of Macropetalichthys in the Collection, but 
the following species have been distinguished :— 
. o 
V 
■A>, 
V* 
'C S* 
4 c 
M 
* 
3 
Macropetalichthys agassizi, J. S. Newberry, Rep. Geol. Sure, 
Ohio, vol. i. pt. ii. (1873), p. 291: Placothorax agassizi , 
H. von Meyer, Neues Jahrb. 1846, p. 596, and Palaeontogr. 
vol. i. (1847), p. 102, pi. xii. fig. 1 : Asterolepis hoening- 
hausii , L. Agassiz, Poiss. Eoss. Y. G. R. (1845), pp. 130, 
147, pi. xxx. a. fig. 10 : Physichthys hoeninghausii, H. von 
y ^ Meyer (in part), Palaeontogr. vol. iv. (1855), p. 80, pi. xv. 
figs. 1-5 {non figs. 6-11) 2 .—Devonian : Eifel, Germany. 
Macropetalichthys pruemiensis, E. Kayser, Zeitschr. deutsch. geol. .JA A 
G es - vol. xxxii. (1880), p. 678 (name only).'—Lower Devo- Ac ^Av 
^ nian; Priim, Eifel. [Fragment; Geol. Surv. Museum, -<A : A 
a J5&! iy&L^TL] W,'X 9 ; 7 J - bA«£ 
jyt 0 ,jy ' Macropetalichthys sullivanti,J . S. Newberry, Rep. Geol. Surv. Ohio, * r '" 
" vol. i. pt. ii. (1873), p. 294, pi. xxiv., pi. xxv. fig. 1, and 
Palaeoz. Fishes N. America (Mon. U. S. Geol. Surv. no. xvi. 
* 
1 
J 
1 J. S. [Newberry, Eep. Geol. Surv. Ohio, vol. i. pt. ii. (1873), p. 290, and 
Palgeoz. Fishes N. America (1889), p. 41. 
2 Tbe specimens described by Meyer are preserved in the Museum of Com¬ 
parative Zoology, Cambridge, Mass., where the present writer has examined 
them. Only the original of figs. 1-5 pertains to Macropetalichthys ; the plate 
shown in fig. 7 being apparently an anterior median dorsal of Pterichthys rhe- 
nanus ; while the original of fig. 9 is a Chimaeroid tooth, and figs. 6, S, and 10 
are not readily determinable. 
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