1893.] NEW YORK ACADEMY OF SCIENCES 125 



fin margin could only occur when the line of the Lasals 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 of 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, 

 rei:)resented the vertical projection of the tail region, — the tail 

 itself being edgewise is represented only in the acutely pointed 

 apex. The tail strixcture, 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. 

 Annual Meeting. 



The President, Dr. Hubbard, 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 Dudley, submitted the following 

 statement for the year 1892-1893. 



