EASTMAN : CARBONIFEROUS FISHES FROM THE CENTRAL WEST. 225 



Fig. 37. Deltodus contortus (St. J. and Worth.). Lower Carboniferous limestone ; 



Vise', Belgium. Posterior dental plate referred to the right ramus of 



the lower jaw, viewed from the posterolateral margin, X }. 

 Fig. 38. Deltodus occidentalis Newb. and Worth. Keokuk limestone ; Keokuk, 



Iowa. Posterior dental plate referred to the right ramus of the lower 



jaw, X \- 

 Fig. 39. Phoebodus dens-neptuni, sp. nov. Keokuk limestone ; Keokuk, Iowa. 



Outer coronal face, X t- 

 Figs. 40, 40 a. Phoebodus Iciiightianus, sp. nov. Florence Flint, Chase formation 



(Permo-Carboniferous) ; Blue Springs, Gage County, Nebraska. 



Lateral and anterior aspects of imperfect crown, showing prominfiit 



projection of the base in the median line in front, X f- 

 Fig. 41. Deltodus spatulatus Newb. and Worth. Keokuk limestone ; Keokuk, 



Iowa. Posterior dental plate referred to the rigiit ramus of the lower 



jaw. 

 Fig. 42. Deltodus spatulatus Newb. and Worth. Burlington limestone ; Burlington, 



Iowa. Posterior dental plate referred to the right ramus of the lower 



jaw, X \. 

 Fig. 43. Deltodus contortus (St. J. and Worth.). Coronal surface^f same specimen 



as shown in Fig. 37, X x- 



The originals of Figs. 35-43 are preserved in the Museum of Comparative 

 Zoology ; the single tooth represented in Figs. 32-34 belongs to the United States 

 National Museum. 



PLATE 5. 



Fig. 44. Phygonemus pandatiis, sp. nov. Kinderhook limestone ; Burlington, Iowa. 

 Lateral aspect of spine, X {■ 



Fig. 45. Phi/sonemus kamus-piscatoiius, sp. nov. Kinderhook limestone; Burling- 

 ton, Iowa. Lateral aspect and cross-seotion of e.xserted portion of 

 spine, X {■ 



Fig. 46. Physonemus hamus-piscatorius, sp. nov. Kinderhook limestone; Burling- 

 ton, Iowa. Exserted portion of spine in lateral aspect, with rugose 

 distal extremity, and a portion of the substance removed by fracture, 

 exposing tubular pulp-cavity, X f A tooth of Eelodus biformis N. and 

 W. is imbedded in the same block of limestone in immediate juxtaposi- 

 tion to this spine. 



Fig. 47. ErismacujUhus barbatus, sp. nov. Kinderhook limestone ; Burlington, 

 Iowa. Fragmentary spine with rudimentary anterior branches, 



Xf 



Fig. 48. Coelacanthus exiguus Eastm. Coal Measures; Mazon Creek, Grundy 

 County, Illinois. Complete individual of average size, X }• 



Fig. 49. ElonicJdhys perpennatus Eastm. Coal Measures; Mazon Creek, Grundy 

 County, Illinois. Complete fish, probably of a young individual, 

 with downwardly flexed caudal fin, fine fulcra on the pectorals, 

 and impressions of the axis showing through the delicate squamation, 



X f. 

 Fig. 50. Tuberculated dermal plate belonging to an undetermined Elasmobranoh. 

 Kinderhook limestone ; Burlington, Iowa, X x- 

 VOL. xxxix. — NO. 7 5 



