1 88 RESEARCHES IN HELMINTHOLOCxY AND PARASITOLOGY. 



[March. 1886. No. 539. See Bibliography.] 



0?i Aviia and its probable Tcenia. — Prof. Leidy stated that in our 

 market on Saturday last three Mud-fishes, Amia calva, had been 

 given to him. They came in a barrel of shad from North Carolina. 

 One was a female about two feet long, the others male, of which 

 the smallest was eight inches. Protruding from the vent of the 

 latter was a little tapeworm, which, on disturbance, retreated into 

 the rectum. Three other worms of the same kind were found in the 

 mouth, but none in the intestine of this or the other fishes. The 

 worms accorded with the description of the Tcenia Jilicolis, infesting 

 Sticklebacks, Gasterosteus, and is probably the same species. They 

 range from i>4 to 3 inches long, gradually widening from the deli- 

 cate thread-like neck to the posterior rounded extremity, where they 

 measure from i to 1.5 mm. wide. The head is spheroidal, variably 

 broader or longer, and about 0.625 mm., with the summit slightly 

 prominent and unarmed and with four hemispherical, lateral bothria 

 0.25 mm. in diameter. Neck variable, when extended long and 

 narrow and usually about half the width of the head. Anterior 

 segments, transversely linear, about an eighth the length of the 

 breadth, gradually becoming inverted saucer-shaped or scutellate, 

 and about one-fourth the length of the breadth. Posterior seg- 

 ments more quadrate, slightl.v widening behind, about 0.75 mm. 

 long and from i to 1.5 mm. broad ; last segment longest and 

 rounded. Genital apertures marginal. 



[August, 1886. No. 541. See Bibliography.] 



NOTICES OF NEMATOID WORMS. 



Filaria scapiceps. — Bod}' cylindrical, nearl}- equally tapering at the 

 ends. Cephalic extremity abruptlj- narrowing, cylindric, rounded 

 at the summit and smooth. Mouth a terminal pore without labia, 

 papillae, or inner armature. Caudal extremity of female nearly 

 .straight, conical, obtusely rounded, .smooth, without appendages ; of 

 the male curved, conical, obtusely rounded alate and papillate ; alae 

 half oval ; papillae five pair, pyriform, successively decreasing to the 

 last at the end of the tail. Genital aperture opening between the 

 ante- and penultimate papillae ; penal spicules short, curved. 



Female 25 to 30 mm. long ; 0.75 wide at middle ; head o. 175 wide. 

 Male 12 mm. long; 0.375 wide at middle. 



Eight females and five males were obtained from beneath the skin 

 of the hind foot of a rabbit, Lepus sylvaticus. (Drawing.) 



