CATALOG OF THE FOSSIL FISHES IN THE CARNEGIE MUSEUM. 405 



15. Ophiopsis tenuiserrata (Agassiz). 

 (For synonymy cf. A. S. Woodward, Cat. Foss. Fishes Brit. Mus., Pt. Ill, p. 168.) 

 This species is represented in the collection by a single imperfectly preserved 

 fish, in counterpart, having a total length of 17 cm., and cataloged as No. 5021 

 + 5021a. 



16. Ophiopsis attenuata Wagner. (Plate LXII, fig. 1.) 



(For synonymy cf. A. S. Woodward, Cat. Foss. Fishes Brit. Mus., Pt. Ill, p. 167.) 

 One excellently preserved example of this species is contained in the collection 

 of the Carnegie Museum. It is cataloged as No. 4856. " 



Genus Histionotus Egerton. 

 17. Histionotus parvus Vetter. 

 1881. Histionotus parvus B. Vetter, Mittheil. K. Mineral. -Geol. Mus. Dresden, 

 Pt. IV, p. 48, PI. II, fig. 5. 



Type. — Imperfect small fish; Dresden Museum. 



The distinguishing specific characteristics of this form are enumerated by 

 Vetter as follows: (1) its relatively small size; (2) its remarkably deep head and 

 proportionally large size of the same; (3) its nearly vertical shoulder-girdle; and 

 (4) the convex posterior margin and rounded inferior angles of the flank-scales. 

 The holotype serving for Vetter's description exhibits a total length of 9.5 cm. 

 and maximum depth of 3 cm., the depth of the head being 2.5 cm., and its length 

 2.7 cm. None of the median fins are preserved, but their position and general 

 outlines are recognizable in the form of impressions. The dorsal fin is seen to be 

 high and acuminate, extending for some distance over the middle of the back; 

 the anal is pointed and remote, and the caudal fin is forked. The width of the 

 caudal pedicle is contained two and a half times in the maximum depth. Teeth 

 are not to be seen in the actual specimen, and according to the author the struc- 

 tures which are represented as such in the lithographic figure "verdanken ihre 

 Entstehvmg der Phantasie des Zeichners." 



So far as known the holotype of the species remains unique. Its characters 

 are worthy of notice in this connection in order that the differences between it and 

 the next following species may be more readily comprehended. 



18. Histionotus reclinis, sp. nov. (Plate LXII, fig. 4.) 



Type. — Nearly complete fish; Carnegie Museum Cat. No. 5002. 

 A small species, attaining a total length of about 10 cm., the length of the 

 head with opercular apparatus being about equal to the maximum depth, and 



