34 PEOCEEDINGS OF THE NATIONAL MUSEUM. vol. 64. 



July 10: 149, in a 135-centimeter shark; menhaden in stomach. 

 Another shark, length 150 centimeters, was examined by Dr. G. A. 

 MacCallum, many small cestodes in spiral valve, the majority of 

 which were P. lasium. 



August 5: 6, in a shark measuring 215 centimeters; menhaden in 

 stomach. 



August 11: 248, associated with 51 C. angustum^ and 3 A. lacin- 

 iatum. There were enormous numbers of ripe proglottides in the 

 chyle. Most of those examined were P. lasiinn; 135-centimeter 

 shark; fish vertebrae in spiral valve. 



August 12: 9, associated with 9 A. laciniatum^ and 113 G. angus- 

 tum; 135-centimeter shark ; menhaden in stomach. Measurements of 

 three 4-celled eggs, living, gave the following results: Lengths, 0.08, 

 0.11, 0.13; breadth of each, 0.02. Dimensions of eggs mounted in 

 balsam: Lengths of 5-celled eggs, 0.156, and 0.159; of 4-celled eggs, 

 lengths, 0.12 and 0.135 ; breadths about the same in eacli^ 0.02. 



August 15 : The sharks which were examined on this date were 

 brought to the laboratory by Otis Luce, who had taken them in his 

 trap at Blackwoods, near Tarpaulin Cove, Vineyard Sound. They 

 were all males, and ranged in length from 144 to 202 centimeters. 

 The stomachs contained menhaden. Seven sharks were examined. 

 P. lasium found in each of them. 



No. 1. Large: 30, maximum length 28 mm.; associated with 5 A. 

 laciniat'iim^ and 9 C. angustum. Many ripe proglottides; most of 

 the eggs 4-celled; length of 3-celled ^gg^ 0.066, breadth^ 0.021, an- 

 other measured 0.084 in length; a 4-celled Qgg measured 0.106 in 

 length; breadth of eggs rather uniform, from 0.015 to 0.021. 



No. 2. Large: 1, length 30; a few free proglottides. 



No. 3. Large: 4, length 28; a few free proglottides. 



No. 4. Large: 70, associated with 1 A. laciniatujn, and 4 C. angus- 

 twm; very many free proglottides. 



No. 5. Medium : 4, maximum length 22 ; very few free proglottides. 



No. 6, Medium: 23, associated with 71 C. angustum; a few free 

 proglottides. 



No. 7. Small: 11, maximum length 36^ associated with 7 A. lacinia- 

 tum, 24 C. angmtum, and 5 P. tnloculatum. 



August 23: 42, associated with 15 A. laciniatum, and 36 C. angus- 

 tum, in a 210-centimeter shark; menhaden in stomach. 



(U.S.N.M., Helm. Coll. 7685.) 



Carcharhinus ohscmnis. 



See page 7 for remarks on the species C. milherti and O. ohscurus. 



Collected in 11 of the years from 1905 to 1918. On 4 dates in 

 July: (1) Few, maximum 12 mm. in 135-centimeter shark; (2) 

 86, in a 120-centimeter shark, associated with 30 A. laciniatum. 10 

 P. trUoGulatuvu and 1 0. oren^colle; a few free proglottides; (3) 



