160 PROCEEDINGS OF THE ACADEMY OF 



outer margin in cross section. The bristles of the California species were 

 very coarse, varying from one to three series between the enamel plates. The 

 bristles of the A. gibbosus much finer, three series together. Length of 

 the latter 8-5 inches, width at base 4-4 inches. In the gray whale or Agaphelus 

 gl a u cus Cope, 22 inches in length, width at base 6 inches. In the former 

 nearly 6 in an inch, in the latter 2^. The baleen of the A. gibbosus be- 

 longed to an immature specimen of 35 feet in length. 



June 30th. 

 The President, Dr. Hays, in the Chair. 

 Thirty-nine members present. 



The amendment to Art. XXI, Chap. XIII, was adopted, as fol- 

 lows : 



"The Department A shall be denominated the Biological and Mi- 

 croscopical Department of the Academy of Natural Sciences of 

 Philadelphia." 



Articles VI, VII and VIII, Chap. XIII, were amended to read 

 according to the original tenor, as follows : 



"ART. VI. — Each department formed as herein provided, shall 

 elect its own officers and members. 



"ART. VII. — Every candidate for admission into a Department 

 shall be proposed in writing by two of its members at one meeting, 

 and be ballotted for at the meeting next succeeding. 



" The affirmative vote of three-fourths shall be necessary to elect a 

 candidate, but no election of members or of officers of a Department 

 shall be valid unless there be present at the meeting six legal voters. 



"ART. VIII. — Every member elect shall pay to the Treasurer of 

 the Department an initiation fee and a semi-annual contribution, the 

 amount of which shall be determined by the members of the Depart- 

 ment, provided that a Department shall not assess its members at a 

 rate exceeding two dollars for initiation and two dollars serai-annual 

 contribution. In other respects the By-Laws, Chap. II, which gov- 

 ern the election of members and correspondents of the Academy, 

 shall apply also to the election of members of any of its Depart- 

 ments." 



The following gentlemen were elected members : 



Roger Sherman, John E. Carter, Francis P. Steel, Wm. Thomp- 

 son, M.D., Wharton Barker, Isaac Comly, M.D., Silbert Combs, L. 

 S. Bolles, M.D., J. F. Holt, M.D. 



The following were elected correspondents : 



Prof Jas. Orton, Dr. Boynton. 



On favorable report of the Committees, the following papers were 

 ordered to be printed : 



Descriptions of seven new species of UNIO from Xorth Carolina. 



BY ISAAC LEA. 



Unio dors ATI'S. — Testa Itevi, triangular!, ad latere planulata, inffiquilaterali, 

 postice subbiangulari, antice rotundata ; valvulis subtenuibus, antice crassi- 



[June, 



