AET. 12. A NEW CESTODE FROM SHARKS — LINTON. 11 



tracted, but measured 10 mm. in length and 3 mm. in breadth, when 

 compressed under the cover-glass. Besides this there were rather 

 numerous very small cestode larvae {Scolex polymorphus) ^ from 0.1 

 to 0.75 mm. in length. There appeared to be the beginning of aux- 

 iliary suckers on the bothria of these larvae. Associated with these 

 larvae were others, considerably larger, some of them with necks 

 differentiated from the body, with sinuous lateral vessels, distinct 

 auxiliary suckers. The smaller examples had two red pigment 

 blotches in the neck, length 3 mm. 



July 20, 1904; 3; fish, hake and menhaden, in stomach of one fish. 



Several examples of P. loliginis found; other larval cestodes. 

 smaller, and, if not associated with this species, and allied to it by 

 intermediate forms, would be called Scolex polymorpJius. 



July 28, 1904; 1; fish in stomach. P. loliginis; 9, grading into 

 forms ordinarily recorded as Scolex polymorphus. 



July 7, 1913. Dr. G. A. MacCalliun showed me a larval cestode 

 from a swordfish which he was examining on this date. The length 

 of the specimen was 10 mm. The general appearance of the worm, 

 which was still active, was like that of Phyllohothriuvi loliginis. 

 The bothria, however, had rather thicker borders, and the auxiliary 

 suckers were relatively larger and deeper than usual. 



Sketches of two of these larval cestodes from the swordfish are 

 shown in figures 14 and 15. 



Besides the above, I have records of the examination of swordfish, 

 in Avhich no larval cestodes were found in the stomach or intestine, 

 as follows: On five dates in July, 8 fish examined; food, fish in 6, 

 fish and squid in 2, 



9. Spheroides maculatus. 



Collections made by Vinal N. Edwards. 



June 4, 1904 ; 20 ; " stomachs contained shell-fish " ; 2 larval cestodes 

 found in one fish. 



June 6, 1914; 10; squid in stomachs; 5 larval cestodes from 4 fish; 

 length of longest worm 30 mm. 



I have records of examinations of puffers in which no examples of 

 P. loliginis were found as follows: On six dates in May, 81 fish ex- 

 amined; fourteen dates in June, 123 fish examined; ten dates in 

 July, 23 fish examined; seven dates in August, 112 fish examined; six 

 dates in September, 8 fish examined. All the collections made in 

 May and June and a part of those made in the other months were 

 made by Vinal N. Edwards. 



Squid were recorded in the food on three dates in June. 



10. Ilemitripterus americanus. 



May 31, 1907 ; 1 ; 8 larval cestodes. 



May 26, 1917 ; 1 ; squid in stomach ; 3 larval cestodes, 7 to 32 mm. in 

 length. 



