FOSSIL FISH. 417 



L. redifronSf De Blain. ; L. ciliaris^ Icht. Ver. ; and Sparus 

 BolcanuSy ibid. These two ichthyolites must be approximated 

 to the foregoing species, for it is probable that they belong to 

 one and the same, though Volta has placed them in two sepa- 

 rate genera. The form of the body, and even the proportions 

 of the parts, are almost alike in both to the last ; but it would 

 seem that the dorsal fin commences still nearer to the nape in 

 these specimens, and that the number of spinous rays is more 

 considerable, since there are at least ten to be reckoned. It 

 also appears that there are two in front of the anal ; the 

 head, in particular, has a different form, for its front, almost 

 straight and declined, is terminated by a very small mouth. 

 This species is as yet unknown in the living state. L. bifas- 

 ciatus and L, malapteruSj of the Veronese Ichthyolithology, 

 cannot, from the very incomplete state of the specimens, be 

 possibly determined. 



Ch^todon. It is of this genus, beyond all doubt, that the 

 greatest number of species, remarkable for their fine preser- 

 vation, are to be found in the locality on which we are now 

 writing. 



Ch. pinnatiformis, De Blain. ; Ch» pinnatus, Volta. — 

 This ichthyolite, which is frequently found at Monte Bolca in 

 the best possible state of preservation, has certainly many 

 relations with the C. pinnatus of Linnaeus ; but still it appears 

 to differ from it very sensibly in the following particulars : — 

 the point of the greatest breadth or elevation is considerably in 

 front of one half the body, at the articulation of the ventral 

 fins, while in pinnatus it is in the middle, and towards the 

 anus ; the upper jaw is shorter than the lower in the one, and 

 the reverse in the other ; the form of the dorsal and anal fins 

 is different ; in the fossil they are directed much more vertically, 

 and, moreover, the size of their rays decreases much quicker, 

 so that the latter half forms a very narrow fin. 



C. subvespertilio, De Blain. ; C. vespertilio, Volta. — 

 Though this fossil skeleton is in a still finer state of preser- 



2 E 



