168 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.88 



Genus MONOSTOMA Zeder, 1800 



MONOSTOMA species 



Plate 26, Figure 345 



A trematode, collected by Vinal N. Edwards from a cod {Gadus 

 morrhua), December 16, 1905 (U.S.N.M. No. 8405), is here noted. 



The specimen was stained and mounted in balsam, but shows but 

 little of the anatomy. The sketch shown in figure 345 was made of 

 the specimen lying in formalin. In the mounted specimen the cirrus 

 is not so clearly outlined as in the sketch. A cirrus pouch is faintly 

 shown, and testes are indicated along the median line toward the 

 posterior end, but the number and outlines cannot be determined. 



Measurements in formalin: Length, 1.82 mm.; breadth, anterior, 

 0.47 mm., middle, 0.58 mm., posterior, 0.39 mm. ; breadth of anterior 

 sucker, 0.47 mm.; diameter of cirrus, 0.07 mm.; distance of cirrus 

 from posterior end, 0.7 mm. The margins are folded under ven- 

 trally ; if flattened the breadth would be increased about 0.14 mm. 



Genus DISTOMA Retzius, 1782 



DISTOMA FENESTRATUM Linton 



Plate 26, Fiqotes 346-348 



Distomum sp. Linton, Bull. U. S. Bur. Fish., vol. 24, pp. 373, 374, figs. 213, 214 

 (from Coryphaena equisetes and C. hippurus), 1905. 



Distomum fenesfratum Linton, Proc. U. S. Nat. Mus., vol. 33, pp. Ill, 112, 

 figs. 86-91 (from Lycodontis moringa), 1907; Carnegie Inst. Washington, 

 PubL 133, p. 51, figs. 105, 106 (from Haemulon plumieri and H. schirus), 

 1910.— SuMNEE, OsEURN, and Cole, Bull. U. S. Bur. Fish., vol. 31, pt. 2, p. 

 5S2 (from Brevoortia tyrannus), 1911. 



Immature distomes, recorded from widely different hosts and 

 localities, as indicated in the above references, are here reported. 



Hosts. — Sand launce {Ammodytes amencanus) , menhaden {Bre- 

 voortia tyrannus)^ round herring {Etnmieus sadina), remora 

 {Remora remora) . 



Record of collections.— F'wq (U.S.N.M. No. 8406), collected 

 November 1, 1913; lengths in formalin, 2.4 to 3.5 mm.; breadths of 

 three about 0.25 mm. ; one measuring 2.85 mm. in length had a maxi- 

 mum breadth of 0.30 mm.; another, length, 3.23 mm.; breadth, 0.20 

 mm. Measurements in balsam: Length, 2.52 mm.; maximum 

 breadth, about 0.45 mm. from posterior end, 0.24 mm. ; anterior 

 sucker, length, 0.051 nun., breadth, 0.036 mm.; diameter of ventral 

 sucker, 0.11 mm.; distance from anterior end to posterior edge of 

 ventral sucker, 0.28 mm. 



From menhaden: One (U.S.N.M. No. 8407), collected July 4, 

 1905; fragment; posterior end showing characteristic constrictions 



