388 MEMOIRS OF THE CARNEGIE MUSEUM. 



1861. Thrissops clupeoides Winkler. 



Natuurk. Verhandl. Holland. Maatsch. [2] Vol. XIV, p. 21, fig. 3. 

 1895. Thrissops clupeoides A. S. Woodward. 



Cat. Foss. Fishes Brit. Mus., Pt. Ill, p. 523. 



Type. — Nearly complete fish; Lyons Museum. 



A species attaining a length of about 25 cm. Head with opercular apparatus 

 contained about four times in the total length exclusive of the caudal fin, and equal- 

 ling the maximum depth of the trunk. Vertebrse about 50 in number, of which 25 

 are caudal. Fins as in the type-species, except that the caudal is much less deeply 

 forked and with broader lobes. Lower limb of the preoperculum ornamented with 

 about ten fine radiating elevated ridges. 



30. Thrissops heckeli Thiolliere. 



1854. Thrissops heckeli Thiolliere. 



Poiss. Foss. Bugey, Pt. I, pi. X, fig. 1 (no description). 

 1895. Thrissops heckeli A. S. Woodward. 



Cat. Foss. Fishes Brit. Mus., Pt. Ill, p. 527. 



Type. — Contorted large fish; Lyons Museum. 



The holotype of this undescribed species is a large specimen having a total 

 length of about 73 cm. It is slender and elongate in form, the proportions resembl- 

 ing those of T. formosus, but the pectoral and caudal fins are much more strongly 

 developed than in that species, and the lobes of the tail are narrower and longer. 



A single specimen in the collection of the Carnegie Museum, cataloged as 

 No. 4091, is apparently referable to this species. It shows the head-region with 

 the opercular apparatus, together with the powerful pectoral fin of the left-hand 

 side, in which thirteen extremely stout rays are to be counted, decreasing in length 

 gradually in a posterior direction. 



