72 PROCEEDINGS OF THE NATIONAL MUSEUM. vot,. 04, 



This scolex was abnormal, in that it had only two perfect probo- 

 scides. The other proboscides were represented by the rudiment of 

 a sheath, and a bulb near the bothria. 



Prionotus carolinus. 



1910, July 8 : 1 cyst on viscera, 12 fish examined. 

 (U.S.N.M., Helm. Coll. 7704.) 



Prionotus strigatus. 



1905, August 23 : Few cysts between submucous and muscular lay- 

 ers of stomach wall, 1 on mesentery, 1 fish examined. 



Pseudopleuro7iectes americanus. 



Collected in 5 of the years from 1905 to 1913, inclusive : One date 

 in May, 11 cysts, 4 to 8 mm. in diameter, 10 fish examined ; 1 date in 

 August, few cysts in wall of intestine, 4 fish examined ; 1 date in Sep- 

 tember, 5 cysts, 9 mm. or more in length, scoleces usual size, from 

 1 fish; 1 date in October, 9 large cysts, the largest 12.5 by 5 by 3.5 

 mm., 20 fish examined; 1 date in November, 1 cyst, 1 fish examined. 



Sarda sarda. 



1904, August 18: 1 cyst from intestine of small bonito, evidently 

 recently introduced with food ; 28 small, and 1 large fish examined. 



1906, August 14: Cysts in intestine, evidently lately introduced 

 with food, 2 fish examined, 20 sand eels in stomachs of each. 



Scomber scombrus. 



Collected in 5 of the years from 1903 to 1922 inclusive ; cysts usu- 

 ally small, yellovdsh-brown, and seed-like in appearance, many de- 

 generate; in most cases 2 nun., or less, in diameter; occasionally larger 

 maximum 5 mm., seen on only 1 date; characteristic hooks of this 

 species found in some of the degenerate cysts. On 1 date in May, few 

 degenerate cysts on viscera, 6 fish examined ; 3 dates in June, few on 

 one of the dates, numerous on the others, on viscera, in mesentery, 

 and embedded in submucosa of stomach and intestine, 23 fish ex- 

 amined ; 2 dates in July, few on serous coat of stomach, and many on 

 pyloric caeca, all small, 13 fish examined ; 3 dates in October, small, 

 degenerate cysts, on viscera, 32 fish examined. Record for June 22, 

 1922 : Viscera of a mackeral, 40 centimeters in length, thickly covered 

 with cysts, from 1 mm. and less, to 5 mm. in diameter, many of them 

 yellowish-brown. Submucosa of stomach and intestine crowded with 

 cysts. A scolex, in fresh water, somewhat compressed, measured 7 

 mm. in length." 



Siphostoma fuscum. 



1921, July 14: 10 cysts in muscle tissue of abdominal wall, 3 to 

 5 mm. in length ; collected by Dr. P. Okkelberg. 



»« For more detailed report, see Journal of Parasitology, vol. 9, pp. 176-177, figs. 1, 2: 

 (March, 1923). Note on Degenerating Cystode Cysts in Mackerel. 



