Teleostei — Clvpeidce and Iloplopleuridce. 



35 



Wiirtemberg, and Licata, Sicily. Alosa occurs in the Infusorial Wall-case, 



Earth of Oran, Algeria. A closely-allied genus, Diplomystas, No. 15. 



with anterior dorsal "ridge-scales," is also found in the Green 



River Shales of Wyoming, U.S.A., and is represented in the 



collection by several well-preserved specimens. Scombroclupea 



(with finlets behind the anal), Rhinellus (remarkable for its long Table-case, 



snout, Pig. 74), Spa?iiodon, Opidopteryx, and Leptosomus, are other No. 51. 



Fig. 1^.— Rhinellus furcatus (after Pictet and Humbert), Upper Cretaceous, Mount 



Lebanon. 



genera from the Cretaceous of Mount Lebanon. And in rocks of 

 the same early period, both in the Old World and the New, there 

 are numerous members of that remarkable section of the family 

 which comprises the Elops, Megalops, and Chanos, of the existing 

 fauna — a fact of considerable interest on account of the numerous 

 points of resemblance to ganoids which these fishes exhibit. Such 

 genera are Thrissopater, from the English Gault, Make, Elopopsis, 

 and Protelops from the Bohemian Chalk, and Rhacolepis, from the 

 Upper Cretaceous of Brazil ; also Halecopsis from the London 

 Clay of Sheppey. Platinx occurs at Monte Bolca. 



The large fishes of the extinct genus Chirocentrites from Mount 

 Lebanon are also probably true Clupeoids. 



The extinct Cretaceous family of Iloplopleuridce follows next to Table-case, 

 the Herrings, and is characterized by the absence of true scales, No. 51. 

 which are replaced by scutes arranged along the back and sides 

 in few symmetrical series. Plinthophorus and Dercetis occur in the 

 Chalk of England ; and Dercetis (Zeptotrachelus) and Eurypholis 

 (Fig. 75), are abundant in the Chalk of the Lebanon, from which 



Fig. lb.— Eurypholis Boissieri (after Pictet and Humbert), Upper Cretaceous, Mount 



Lebanon. 



locality a fine series in almost perfect preservation may be seen in 

 the cases. The genera Pelnraorhynchus and Ischyrocephalus are 

 from the Cretaceous of Westphalia, and SaurorhmnpJius from the 

 Chalk of Comen, Istria. 



