ART. 21. I'AEASITES OF SHAEKS AND SKATES LINTON". 105 



Seriola zonota. 



1910, August 16 : 1, length 1.12 mm., 2 red pigment patches, head 

 and neck transparent, yellowish, body opaque, 3 fish examined. 



1913, September 22 : 1, length 1,43 mm., 7 fish examined. 



Siphostoma fuscn.m,. 



1919, July 15: 1, in one 45 mm. fish. 



Spheroides maculatus. 



1907, August 1 : Number not noted, small, no pigment, 2 fish ex- 

 amined. 



Stenotomus chryaopH. 



Collected in 8 of the years from 1904 to 1920, inclusive : On 7 dates 

 in July, few on 2 of the dates, 12 fish, size not noted, examined; on 

 the remaining 5 dates, from 2 to 27 larvae found in each of 7 fish, 

 measuring from 2.5 to 14 centimetei-s in length. On 14 dates in 

 August, on 1 date 1 larva, 7 fish examined, on another few, 6 fish 

 examined ; on remaining dates from 1 to numerous in each of 88 fish, 

 measuring from 2.7 to 14 centimeters in length. On 1 date in 

 September, many from a 7-centimeter fish. 



Larvae all small with two red pigment spots ; rudiments of costa© 

 noted on one date. 



Trichiurus leptui'us. 



1903, July 6 : Very numerous, among villi of pieces of intestine in 

 bottle, estimated to be 3,900 to the square inch, 212 large and 28 

 small fish examined. August 6: Same conditions as in foregoing, 

 283 large fish examined. September 16: Enormous numbers from 

 pieces of intestine; much contracted by the formalin, oval-elliptical 

 to globular, 0.6 to 0.8 mm. in length. 



1904, August 2 : Very numerous, among intestinal villi, 2 fish ex- 

 amined. 



1913, June 18: Very numerous, length in formalin about 2 mm., 

 1 fish examined. These larval cestodes were found in the pyloric 

 caeca, but most abundant in the intestine where, in many cases they 

 were embedded in the mucous membrane so close together as to make 

 the number in a given area equal to that area divided by the area of 

 a cross section of a Avorm. The number to the square inch, given 

 above, was estimated from several counts made at diiferent places on 

 different pieces of intestine. 



Tylosurus marinus. 



1904, August 25 : Few, 2 pigment patches, no costae, 3 fish exam- 

 ined. 



1907, September 9 : Few, small, 2 red pigment patches, 5 fish ex- 

 amined. 



1912, September 9 : 2, small, no pigment, 1 fish examined. 



