141 



unequal or heterocercal. Until we obtain an entire specimen, 

 perhaps it will be prudent to abstain from giving a specific name. 

 It is a species of the genus PalcEoniscus. 



No. 5. This species so nearly resembles the Palceoniscus de- 

 corns of Sir Philip M. de Egerton, as on first view to pass for it ; 

 but on examining the lines of striae, we are forced to regard it as 

 another species. The four great dorsal scales, anterior to the 

 dorsal fin, exactly resemble in form those represented in Sir 

 Philip M. de Egerton's plate. (See Quarterly Journal Geologi- 

 cal Society of London, for 1849.) The scales of one specimen 

 are striated, parallel with the superior and inferior margins, and 

 are deeply and acutely serrated on their posterior edges. The 

 lines of striation are worn away considerably, indicating, per- 

 haps, that it was an old fish. It was, when entire, about eight 

 inches long, and it is two inches in diameter from the anterior 

 edges of the dorsal and anal fins. This specimen appears to be 

 of the same species, or very near the species, last described. 



No. 6 is a beautiful and perfect fish, found at the new pit of 

 the Albert coal mine, by Mr. Wallace, Deputy Collector of Hills- 

 boro', who kindly presented it to me. It is compressed verti- 

 cally, or from the back towards the abdomen, and the head is 

 also vertically compressed between the strata. The large dorsal 

 scales, so characteristic, are seen along the middle of the fish. 



Description. — Fish is 4^ diameters of its body long; body 

 3-]- inches long ; head in form of equilateral spherical triangle ; 

 gills open ; back of head beautifully marked by tuberculations, 

 or strisB and dots ; dorsal scales oval-shaped and striated, the 

 most pointed part of the scale being towards the tail, — they run 

 along the entire back to the tail, excepting at the place where the 

 dorsal fin is compressed ; scales of body serrated on posterior 

 margins, and striated parallel with their upper and lower edges, 

 and wavy in middle. I am disposed to regard this individual as 

 belonging to the same species as the one before described. 



No. 7. This specimen was discovered by me in the shale of 

 the new shaft of the Albert mines. It is peculiarly interesting 

 on account of the entire preservation of its abdominal fin, and 

 also on account of its association with a coprolite which seems to 

 have belonged to this individual. 



Description. — Fish, entire ; length, 3/^ inches; width of 



