41 



PLATE II. 



Reproduced from a photograph of Dr. Jackson's original Plate II, illustrating the descriptions of 

 fossil fishes in his "Report on the Albert Mine, etc.," 1851. 



Fio'. 1. In his reference to this specimen Jackson expresses the opinion that it "appears 

 to be of the same species, or very near the species" represented in plate I 

 figure IV. It consists of the left side of the fish from a little in advance of the 

 dorsal and ventral fins backward to include the anal fin. The original belongs 

 to the Boston Society of Natural History, No. 7902. 



Fig. 2, 2 bis. Referred to by Jackson as a small species of Palffioniscus. The original of 

 figure 2 is in the Museum of Comparative Zoology, Cambridge, No. 1959. 

 Figure 2 bis shows the imprint of the same. The fish has been flattened verti- 

 cally and presents a dorso-lateral view. The left pectoral, and anal fins are pre- 

 served. 



Fig. 3. Dr. Jackson expresses the opinion that the original of this figure belongs to the 

 same species as the fish represented in figure 2, 2 bis. The specimen is the pro- 

 perty of the Museum of Coinparative Zoology, Cambridge, No. 1958, and is also 

 flattened so as to show the back. 



Fig. 4. Although figured, this specimen is not mentioned in Jackson's descriptions. Its 

 whereabouts is not known. The figure shows the posterior half of a fish, left 

 lateral aspect. 



Fig. 5. Not mentioned by Jackson. The original is in the museum of the Boston Society 

 of Natural History, No. 7898. It also consists of the hinder half of a fish, left 

 side. The dorsal, anal, and caudal fins are well preserved. 



Fig. 6. Wrongly referred to in Jackson's description (p. 24) as figure 8. The specimen is 

 apparently lost. The full length of the fish was preserved. 



Fig. 7. Lower jaw of a Palseoniscus, the property of the Museum of Comparative Zoo- 

 logy, Cambridge. No. 1953. 



Plate II, figure 8. This specimen, not referred to in Jackson's report, is in the possession of 

 the Boston Society of Natural History, No. 7898a. Slightly more than half 

 the fish is seen, from about the position of the ventral fins to the extremity of 

 the tail. The dorsal and anal fins are shown. 



