ROOM V. FOSSIL FISHES OF MONTE BOLCA. 443 



nation, examples of the following genera, from this celebrated locality, 

 viz. Lates, Cyclopoma, Enoplosus, Serranus, Pelates, Myripristis, &c. . 



Of this Order, and from the same inexhaustible mine of Ichthyolites, 

 are the fine specimens of Callipteryx recticaudus, and of the Sparoids 

 (Breams), Cottoids (Bullheads), and Goboids ; and that remarkable fish 

 the Semiophorus velifer, in the Case before us. 



Beneath the last-named Ichthyolite, there is a rare specimen of Fistu- 

 laria magnified, from the Engi slate of Glaris. 



A beautiful example of Mugil (M. princeps), from Aix, in Provence, 

 is placed in the upper part of the same case (No. 20) ; it was formerly 

 in my collection ; the muscles of the abdomen, fin-rays, &c. are finely 

 preserved. Near these fishes there is a remarkable ichthyolite, Calomo- 

 pleurus cylindricus, from the north of the Brazils, by Mr. Gardiner, 

 from strata supposed to be of the cretaceous epoch. 



CYCLOID ORDER. The essential character of the fishes of this Order 

 are an osseous skeleton, and scales of a circular or cycloid form, with 

 smooth margins, composed of plates of horn or bone, without enamel. 

 To this Order the greater number of the fresh-water fishes belong ; 

 as the Pike, Carp, Trout, Salmon, &c. The palaeontological history 

 of this Order corresponds with that of the Ctenoids ; in fact, the fishes 

 of these two divisions, appear to constitute but one natural group. 



There are no known cycloid fishes in strata below the Cretaceous 

 formation ; and those which occur in the Chalk belong to extinct 

 genera. In the ancient tertiary the cycloids abound. Monte Bolca has 

 yielded some genera and many species, hitherto unknown elsewhere. 

 The collection contains a great many beautiful examples of the various 

 generic types ; these are enumerated in the general list, and the position 

 in the cabinets of the most important fossils is indicated by the table 

 at the bottom of the page. 1 



ENCHODUS. Wall-case C. (No. 21.) The upper and lower jaws, with 

 long, pointed, conical teeth, of a fish of the scomberoid or mackerel 

 family, in high relief from the blocks of chalk to which they are 

 attached, are placed on the middle shelf of this Case. These teeth are 

 remarkably well developed ; they are rounded on the inner aspect and 

 compressed externally ; the two anterior ones of the lower jaw are very 



