38 



PLATE I. 



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

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



Fig. 1. Palceoniscus alberti, Jackson. Type of the species. The original is in the Museum 

 of Comparative Zoology, Cambridge, No. 1960. It shows the left side, is imper- 

 fect anteriorly, and lacks the pectoral and ventral fins. 



Fig. 2. Palceoniscus brovmi, Jackson. Type of the species. Original in the Museum of 

 Comparative Zoplogy, Cambridge, No. 1961. A well preserved specimen, pre- 

 senting the left side. The head, the lower surface in advance of the anal fin, 

 and the extremity of the tail are missing. 



Fig. 3. Palaoniscus cairnsi, Jackson. Type of the species. Original in the Museum of 

 Comparative Zoology, Cambridge, No. 1956. The entire length of the fish, 

 right side. Pectoral and ventral fins showing, in part, dorsal and anal fins 

 better preserved. 



Fig. 4. Referred to by Dr. Jackson as Palceoniscus sp. Type of P. jacksoni, Dawson. 

 The hinder portion of a large fish, right side, from the neighbourhood of the dorsal 

 ^,. fin backward including the tail. This specimen is apparently lost. 



Fig. 5. Specimen in the Museum of Comparative Zoology, Cambridge, consisting of the an- 

 terior half of the fish, right side. No. 1957. No fins preserved. Not men- 

 tioned in Jackson's report. 



Figs. A, B, and C. Represent separate scales, of the natural size, and also enlarged about 

 four times. These particular scales are not mentioned by Jackson, and the 

 specimens themselves have not been found. 



