406 MEMOIRS OF THE CARNEGIE MUSEUM. 



contained slightly less than four times in the total length to the base of the caudal 

 fin, which latter is scarcely forked and consists of about twenty-four rays. The 

 short and low dorsal, with ten articulated rays, arises behind the middle point of 

 the back, and the anal with fewer rays, is nearly opposite. Pectorals large, with 

 about seventeen rays. Fulcra well-developed on all the unpaired fins. Scales in 

 regular series, none especially deepened, posterior border nearly straight and strongly 

 denticulated, the squamation extending over the upper lobe of the tail, and pro- 

 ducing an upturned appearance of the latter. The specific title has reference to 

 the last-mentioned character. Orbit large, high up; dentition not observed. 



Genus Macrosemius Agassiz. 



19. Macrosemius rostratus Agassiz. (Plate LXIII, fig. 2.) 



(For synonymy cf. A. S. Woodward, Cat. Foss. Fishes Brit. Mus., Pt. Ill, p. 177.) 



This species is represented in the collections of the Carnegie Museum by 

 two excellent examples, cataloged under the numbers 4764, 4765. 



20. Macrosemius dorsalis, sp. nov. (Plate LXV, fig. 2.) 

 Type. — Distorted fish; Carnegie Museum Catalog No. 4765. 



A species of moderate size, attaining a total length of about 20 cm., in which 

 the length of the head with opercular apparatus is contained about four times. 

 Dorsal fin much elevated, and comprising about thirty-two rays, denticulated on 

 their posterior borders, and somewhat expanded distally. Pelvic fins arising 

 slightly in advance of the middle point between the pectoral and caudal fins, and 

 the anal arising shortly behind. Exposed portion of the scales covered with fine 

 striae extending from the delicate pectinations of the posterior border. 



This species, which is founded upon a unique, but somewhat crushed speci- 

 men from Solenhofen, approaches in certain respects the forms described from Cerin, 

 France, by ThioUiere; but is distinguished from them by the greater elevation of 

 the dorsal fin, and the slenderer form of the rays, which are but little expanded 

 distally. 



Genus Propterus Agassiz. 



21. Propterus microstomus Agassiz. (Plate LXII, fig. 3.) 



(For synonymy cf. A. S. Woodward, Cat. Foss. Fishes Brit. Mus., Pt. Ill, p. 183.) 



This elegantly formed fish is of comparatively rare occurrence in the Litho- 

 graphic Stone of Bavaria, and has not been found elsewhere. No examples are 

 contained in the collections of the British Museum, and but one, an exceedingly 



