xo. 2177. FOSSIL FISHES IN NATIONAL MUSEUM— EASTMAN 



249 



Giirich Mn 1891, and some further changes m the restoration of Coc- 

 costeus were proposed in a series of articles by Otto Jaekel,'- pub- 

 lished during the first decade of the present century. Concerning 

 one of the restorations put forward by the last-named author, that 

 of the cranial shield of his so-called Pachyosteus hvlla, it is to be noted 

 that the pattern of plate arrangement is ahnost precisely the same as 

 observed in primitive species of DinicUTiys, This will be obvious 

 from a comparison of the annexed text-figures 3 and 4, showing 

 respectively the Wildungen species and D. lid.modeus from the New 

 York Devonian. 



DINICHTHYS TIIBERCULATUS Newberry. 



Plate 2, fig. 1 . 

 Dinichthys tnhirculatus Newberry, Monogr. IT. S. (ieol. Surv., vol. 16, 1889, p. 

 98, pi. 32, fig. 3. 

 Of this species only isolated plates of the body armor are known, 

 most of them imperfectly preserved. Only one, an antero-dorso- 



Ym. 3. — Dinichthys bulla (Jaekel). Upper 1)evonla.n, Wildungen, Germany. Restoration or 



HEAD-SHIELD. SLIGHTLY MODIFIED AFTER JAEKEL. C.CENTBAL; £0, EXTERNAL OCCIPITAL; 3r,MARGINAL; 

 MO, MEDIAN OCCIPITAL; P, PINEAL; PO, PREORDITAL; PtO , POSTORBITAL; R, ROSTRAL; SO, SUBORBITAL. 



lateral element, from the Chemung of Warren, Pennsylvania, was 

 figured by Newberry. Regarding this species, this author remarks: 



In size this fish was comparatively small; the suprascapular plates are about three 

 inches in length and breadth and nearly half an inch in thickness at the center. . . . 

 The dorsomedian is also very small: it was not more than three inches in breadth 

 and length, judging from the portion preserved. 



1 Giirich, O. Ueber Placodermen und andere devonische Fischreste in Breslauer mineralogischen 

 Museum. Zeitsclir. Deutsch. Geol. Ges., vol. 43, 1891, pp. 902-913. 



2 Jaekel, O. Ueber Coccosteus und die Beuitheilung der Placodermen Sitzber. Ges. Naturf. Freundo 

 Berlin, 1902, No. 5, pp. 103-115; Ueber die Organisation und systematische Stellung der Asterolepiden. 

 Zeitschr. De'utscli. Geol. Ges., vol. 55, 1903, Mai-Protokoll, pp. 41-60; Einige Beitriige zur Morphologie der 

 altesten Wirbeltiere. Sitzber. Ges. Naturf. Freunde Berlin, 190G No. 7, pp. 180-189; 1907, p. 172, text fig. 1. 



