1893. | NEW YORK ACADEMY OF SCIENCES 125 
fin margin could only occur when the line of the basals was still 
embedded in the body wall,—and would trace this conclusion 
still further to account for the anomalous fin spines of the 
Acanthodians. In Parexus, for example, it would seem quite 
clear that the broad fin spine is structurally compound, and may 
well represent the fusion of the radials in the anterior fin 
margin. 
It may, in passing, be noted that the museum of Columbia 
College has acquired one of the specimens oi Dr. Kepler, which 
sets at rest the objections of Jaekel as to the character of the 
body terminal. In the former specimens this, as now known, 
represented the vertical projection of the tail region,—the tail 
itself being edgewise is represented only in the acutely pointed 
apex. The tail structure, as shown in lateral aspect, proves to 
be broadly heterocercal, and is especially remarkable in lacking 
hypural supports to the upper lobe. ‘This is strengthened 
epurally by a cut-water plate formed of the clustered elements, 
The tail structure is in many regards Acanthodian. 
In the ventral of Cladoselache, the writer concludes, is repre- 
sented the most primitive condition hitherto known in the 
ontogeny of the paired limbs. The fin is still outwardly a body 
derm fold, thrice as long as broad, blunted anteriorly where 
the radials are begining to be clustered ; the basal supports, in 
number, scarcely less than the appended radials, are still 
unfused although the process of concentration anteriorly is 
clearly to be marked. 
February 27, 1893. 
AwnnuaL MEETING. 
The President, Dr. Hupzarp, in the chair, and about forty 
persons present. 
The minutes of the meeting of January 30th were read and 
_ approved. 
The chairman of the Audubon Monument Committee made a 
report of progress which was accepted and committee continued. 
The Treasurer, Mr. Henry Duptey, submitted the following 
statement for the year 1892-1893. 
