CATALOG OF THE FOSSIL FISHES IN THE CARNEGIE MUSEUM. 423 



48. Thrissops formosus Agassiz. (Plate LXII, fig. 2.) 



(For synonymy cf. A. S. Woodward, I. c, Pt. Ill, p. 521.) 



A large series of Thrissops belonging to this species are contained in the Bayet 

 Collection of the Carnegie Museum, several complete and admirably preserved 

 individuals being among the number. These specimens bear the following catalog 

 numbers: 4030, 4702, 4789. 



49. Thrissops salmoneus (Blainville). (Plate LXXII, fig. 1.) 



(For synonymy cf. A. S. Woodward, I. c, Pt. Ill, p. 522.) 



This species is represented in the collection by specimens bearing the following 

 numbers: 870, 4717, 4773, 4813, 4818 + a, 4894, 5088, 5090. 



Genus Parathrissops novum. 



A genus resembling Thrissops in general characters, but distinguished from 

 it by its relatively much shorter and compact form of trunk, and by the more 

 anterior position of the dorsal fin, which arises somewhat in advance of the anal 

 and is not much extended. Anal relatively shorter than in Thrissops. 



50. Parathrissops furcatus sp. nov. (Plate LIX, fig. 2.) 



Type. — Nearly complete fish in counterpart; Carnegie Museum Cat. No. 

 4029 + 4029a. 



The type and only known species, attaining a total length of about 23 cm. 

 Head with opercular apparatus contained four and one-half times in the total 

 length of the fish; maximum depth of trunk equalling the length of the head with 

 opercular apparatus, and contained a little more than two and one-half times in the 

 length of the trunk from the pectoral arch to the base of the caudal fin. Vertebrae 

 about forty-four in number, half of them being abdominal, and half caudal. Pelvic 

 fins arising but little nearer to the anal than to the pectorals; dorsal fin, with fifteen 

 rays, arising somewhat in advance of the origin of the anal, which is much elevated in 

 front, and comprises about twenty-two rays; caudal fin deeply forked and with 

 expanded lobes. Scales thin, ornamented with exceedingly delicate concentric striae. 



The holotype of this species is an admirably preserved individual having a 

 total length of 23 cm. and depth of 5 cm. It is readily distinguished from all 

 other species by the form and proportions of the body and more forward position 

 of the dorsal fin, together with the deeply furcate and broad-lobed character of 

 the caudal. 



