14 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. GK 



when they were actively contracting and extending. Length, 5.5^ 

 straightened in alcohol, in which they showed a tendency to contort : 

 4 free segments. 



1923, August 28 : 9, small, from a 173-centimeter shark. 



CROSSOBOTHRIUM LACINIATUM Linton. 



1889b, pp. 469-474, pi. 3, figs. 4-18. 

 1890, pp. 799-802, pi. 7, fig. 4. 

 1897tf, pp. 445-446. 



1900, p. 273. 



1901, p. 429. 

 1910a, p. 694. 

 1910&, p. 1200. 

 1911, p. 585. 



Dr. W. C. Curtis, Biological Bulletin, vol. 5 (1903), pp. 125-142, figs. 1-8; 

 vol. 11, (,1906), pp. 202-228, pis. 4-7. 



FolloAving are records of this cestode not before published : 



Carcharias taurus. 



This cestode appears to be peculiar to the sand shark, from the 

 spiral valve of which it is rarely absent. 



Collected in 7 of the years from 1904 to 1922: On 4 dates in 

 June: (1) 7 large, maximum 100 mm., a few small, and a few free 

 proglottides; (2) very numerous, adult, young, and free pro- 

 glottides; (3) 12, and numerous free proglottides, from a 150-centi- 

 meter shark; (4) few, no free proglottides, from a 105-centimeter 

 shark. On 3 dates in July : (1) 108, large and small, from 2 sharks; 

 (2) a few fragments of strobiles, and a few free proglottides; (3) 

 21, and a few free proglottides; among the strobiles were four 

 with adult segments, beginning about 10 mm. back of the scolex. 

 On 8 dates in August: (1) Numerous in each of 2 sharks; (2) 2 

 mature, 1 young; (3) few, large and small; (4) few, small; (5) 1 

 mature, free proglottis; (6) several, large and small; (7) numerous, 

 some small, none with ripe proglottides; (8) 4, with many free 

 proglottides, collected by Dr. G. A. MacCallum. On 8 dates in 

 September: (1) very numerous, adult, young and free proglottides; 

 (2) numerous in each of 2 sharks, adult, only 1 young noted, large 

 numbers of free proglottides; (3) many, adult, young, and free 

 proglottides; (4) numerous, a few young, many free proglottides; 

 (5) numerous, a few young, many free proglottdies ; (6) 2 frag- 

 ments; (7) 35 with scoleces, many without scoleces, and many frag- 

 ments, great numbers of free proglottides, some of them unusually 

 large, length 7 mm., breadth 3,5 mm.; young and adult, maximum 

 length 120 mm., formalin material; (8) 1, from a 202-centimeter 

 shark, and 91 from a 130-centimeter shark. 



