TKEMATODES FROM FISHES — LINTON 43 



intestines dark brown; ova in distal portions of uterus dark amber, 

 those in middle folds lemon-yellow, those in newer folds, near the 

 shell gland, nearly colorless. Excretory vessels voluminous, the two 

 lateral branches extending from the level of the oral sucker to the 

 posterior end where they unite in a short muscular excretory vessel, 

 which opens at the terminal excretory pore. These branches may be 

 in position to simulate intestinal diverticula, especially when con- 

 stricted at the anterior end, and filled with granular material resem- 

 bling the contents of the intestine, and were so wrongly interpreted 

 in the Beaufort report. Necks very flexible, becoming at times 

 slender and linear. The worms have a tendency to coil ventrally, 

 with suckers adhering to the post ventral region. 



Seventy-one distomes, two of them immature, collected on eight 

 dates, August 7 to 23, 1906, from 16 puffers. Thirty-eight, collected 

 from 6 puffers on three dates, August 1 to 10, 1907. Fifty, collected 

 from 16 puffers on four dates, June 27 to 30, 1910. On June 28 and 

 subsequent dates circular ciliate Protozoa, identified by Dr. C. W. 

 Hahn as Cyclochaeta domerguei Moroff, were found moving about 

 on the surface of these distomes. 



Fifty-one, collected from 27 puffers on seven dates in July, one 

 in August, and one in September, 1910, from July 5 to September 6. 

 All from pharynx of host, usually near the point where it merges 

 into the distensible sack. Nine of the fishes examined had no distomes 

 of this species, the others had from one to three. They ranged from 

 immature forms, 2 to 3 mm. in length, to adults 10 mm. in length 

 and 3 mm. to 4 mm. in breadth when moderately extended. 



One, collected by Vinal N. Edwards on June 9, 1914, from puffer; 

 six fishes examined. Three (U.S.N.M. No. 8189), collected July 2, 

 1915, one fish examined. 



From Mr. Edwards' notes of collections in 1915, I fimd that he 

 examined 149 puffers on 13 dates in May, June, and September, when 

 no distomes of this species were recorded. 



Subfamily Haplocladinae Odhner, 1911 

 Genus TERGESTIA Stossich, 1899 



TERGESTIA PECTIN ATA (Linton) 



Distomttm pectinatum Linton, Bull. U. S. Bur. Fish., vol. 24, pp. 366, 389, figs. 



200-203, 1905. 

 Theledera pectinata (Linton), Carnegie Inst. Washington, Publ. 133, pp. 40, 41, 



1910. 



Six distomes (U.S.N.M. No. 8190), belonging to this species were 

 collected from the intestine of a frigate mackerel (Auxis rochei), 

 July 12, 1912, taken in a fish trap in Buzzards Bay, Woods Hole, 



