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COCCOSTEID-E. 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, New York.] 



Genus MACROPETALICHTHYS, Norwood & Owen. 



[Amer. Journ. Sci. [2] vol. i. 1846, p. 371.] 



Syn. Physichthys, H. von Meyer, Palaeontogr. vol. iv. 1855, p. 80. 



Agassichthys, J. S. Newberry, Bull. National Institute, 1857, 

 p. 3. 



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- 

 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 

 6till remains to be determined. 



There are no remains of Macropetalichthys in the Collection, but 

 the following species have been distinguished : — 



Macropetalichihys agassizi, J. S. Newberry, Eep. Geol. Surv. 

 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- 

 hat(sii, L. Agassiz, Poiss. Foss. Y. G. E. (1845), pp. 130, 

 147, pi. xxx. a. fig. 10 : Physichthys hoeninghansii, H. von 

 Meyer (in part), Palseontogr. vol. iv. (1855), p. 80, pi. xv. 

 figs. 1-5 (nonfigs. 6-11) 2 . — Devonian : Eifel, Germany. 



Macropetcdichthys pruemiensis, E. Kayser, Zeitschr. deutsch. geol. 

 Ges. vol. xxxii. (1880), p. 678 (name only). — Lower Devo- 

 nian ; Priim, Eifel. [Fragment ; Geol. Surv. Museum, 

 Berlin.] 



Macropetalichthys sullivanti,! . S. Newberry, Eep. Geol. Surv. Ohio, 

 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. 



J. S. Newberry, Eep. Geol. Surv. Ohio, vol. i. pt. ii. (1873), p. 290, and 

 Palaeoz. Fishes N. America (1889), p. 41. 



* The 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, 8, and 10 

 are not readily determinable. 



