No. 2322. TREMATODE FAMILY HETEROPHYIDAE— RANSOM. 547 



250 pi. (180 to 250 ^ according to Jagersldold, 136 to 184 [x, Wigdor). 

 Ventral sucker, 55 to 85 pi in diameter, its cavity connecting with 

 the genital sinus by a narrow tube. Eight testis obliquely behind 

 the left. Testes slightly lobed, irregularly globular or oval, 120 to 

 250 [JL by 70 to 130 ^ (about 250 by 130 \i. according to Jagerskiold). 

 Ovary lobulated, may present the outline of a clover leaf; width, 

 140 to 180 [x; length, 70 to 120 [x (width 180 [x, length 80 [j., thickness 

 120 [JL, according to Jagerskiold). Vitellaria extend anteriorly be- 

 yond the level of the ventral sucker, usually a considerable distance, 

 encroaching upon the median field in front of the ventral sucker, 

 sometimes merging in the median line. Posteriorly they fill up most 

 of the post-testicular region, and commonly cross the median line 

 on the dorsal side of the excretory vesicle. Distance from the trans- 

 verse vitelline ducts to the center of the ventral sucker greater than 

 the distance from the latter to the anterior limits of the vitellaria, 

 usually considerably greater, and may be four times as great. Eggs, 

 40 to 50 [X long by 18 to 25 j;. wide (42 by 20 [x, Olsson, 18765; 48 by 

 22 [X, Jagerskiold ; 47 to 49 [x by 22 to 25 ix, Nicoll ; 40 by 20 [x to 47 

 by 23 f., Linton ; the minimum length given by Wigdor appears to be 

 abnormal; according to him the length is 32 to 48 [x, width 18 to 

 22 ix). 



Immature encysted stage. — Cysts 0.32 to 0.36 mm. in diameter, 

 with transparent wall about 50 [x thick, surrounded by masses of black 

 pigment cells; surface of cyst not covered by pigment. Worms ex- 

 tracted from cysts, 0.47 to 0.82 mm. long, 0.17 to 0.2 mm. broad. 

 Oral sucker 50 to 00 [x wide. Pharynx 40 to 48 [x long by 21 to 35 [x 

 wide. Surface of body covered with a dense coat of cuticular scales. 

 Arrangement of internal organs, or of their rudiments, similar to 

 that in the adult worms. 



Hosts. — ColyTTibus auritus; Gama imber; Larus marinus; L. argen- 

 tatus; L. fuscus; L. atricilla; Nycticorax nycticprax; Rissa tridac- 

 tyla: Alca torda; Sterna dougalli; S. Khmndo; Ganis familiaris; and 

 Phoca vituUna. Immature stages encysted in cunner {Tautogolahrus 

 adspersus) ; tautog {Tautoga onltis) and other fishes. 



Location. — Intestine. (Immature stages encysted in skin and gills 

 of fishes and free among adults in intestines of final hosts.) 



Localities collected. — Europe; United States (Detroit, Michigan, 

 Woods Hole, Massachusetts, and Washington, District of Colum- 

 bia) ; Nova Scotia (Cape Breton). 



Looss (18995) took lingua as the type of the genus Tocotrema but 

 its characters are so similar to those of the type of Gryptocotyle {O. 

 concava) that the two can not be separated generically. 



The most complete description of C. lingua is that given by 

 Jagerskiold (1899a). Nicoll (19075) and Linton (1915) have added 

 further data. Wigdor (1918) redescribed it as a new species. Halluni 



