404 MEMOIRS OF THE CARNEGIE MUSEUM. 



Genus Lepidotus Agassiz. 



12. Lepidotus notopterus Agassiz. 



(For synonymy c/. A. S. Woodward, Cat. Foss. Fishes Brit. Mus., Pt. Ill, p. 92.) 



This species is represented in the Bayet Collection of the Carnegie Museum 



by a single contorted individual, in which the squamation of the posterior part 



of the trunk is well displayed. It is cataloged as No. 697. 



13. Lepidotus ovatus, sp. nov. (Plate LVIII, fig. 2.) 



A species attaining a length of about 38 cm. and closely resembling L. minor 

 in form and proportions, but with more strongly developed median fins, without 

 dorsal ridge-scales, and the heavier squamation of the trunk arranged in more 

 numerous longitudinal and transverse series. Flank-scales apparently smooth 

 and not serrated. Fin-fulcra very large, those of the dorsal fin seven in number 

 and more than half as long as the anterior dorsal fin-rays; those of the anal fin 

 twelve in number and proportionally shorter. Pelvic fins arising midway between 

 the pectoral pair and the anal, in this respect differing from the condition observed 

 in L. notopterus. 



The holotype and only known example of the species, the distinguishing 

 characters of which have just been summarized, is a nearly complete fish, pre- 

 served chiefly in impression, which bears the catalog number 4730. It has a total 

 length of 29 cm. to the base of the caudal fin, in which the length of the head with 

 opercular apparatus is contained four times. The maximum depth of trunk 

 is 11 cm. The number of oblique scale-rows counting along the lateral line is 

 about forty, and of longitudinal scale-rows in the middle of the body about twenty- 

 four. 



Family MACROSEMIID^. 



Genus Ophiopsis Agassiz. 



14. Ophiopsis procera Agassiz. (Plate LXX, fig. 1.) 



(For synonymy c/. A. S. Woodward, Cat. Foss. Fishes Brit. Mus., Pt. Ill, p. 166.) 

 This genus and species was instituted by Agassiz upon the evidence of two 

 incompletely preserved skeletons from the Lithographic Stone, one of which had a 

 total length of about 30 cm. and the other of 10 cm. The smaller specimen was 

 regarded by Agassiz as indicating an immature individual, and the larger as repre- 

 senting the full-sized or adult stage of the species. We here follow the procedure 

 of Agassiz in referring to 0. procera a small example measuring 14 cm. in total length, 

 which bears the catalog number 4690. Another larger example in the collection 

 is cataloged as No. 4691. 



