69 



very small (0.02 nun. in diameter), the tissue about tin- head 

 end rather lm<lly broken, and (lie detail^ of nirintli structure 

 uncertain. ( Apparently there arc (line minute lips, four 

 sided, with broad base, the anterior margin ncarlv straight 

 and not as wide as base, the lateral margins convex; each lip 

 with a single median prominence.) No biiecal capsnlc. 

 Esophagus long and slender, with triradiate lumen, without 

 bulb, but widening posteriorly in delicate clavate manner 

 In-fore opening into intestine. Ventral surface of tail flat- 

 tened to concave; uncertain from cnticidar damage as to exist- 

 ence of cuticular expansions here and the formation thereby of 

 a definite bursa. Tail tightly enrolled; tip of tail rounded, 

 slightly constricted from the body of the tail, with several 

 uncertain papilla-like prominences along its border as shown 

 in drawing (Fig. 1). Cloaca 0.3 mm. from caudal end. 

 Genital spicules (Fig. 2, a and a) unequal (0.27 arid 0.55 mm.), 

 grooved, the accessory piece relatively broad and flared out 

 at distal end into a coarse barb. Eleven pairs of papillae, of 

 which six are precloacal; all closely set about the cloacal 

 orifice, the most posterior being 0.21 and the most anterior 

 0.39 mm. from the tip of the tail. 



The uncertainty of specific classification is seriously in- 

 creased by the poor condition of the specimen and the fact 

 that no female examples were obtained. The fact of the 

 existence of six pairs of precloacal papilla- would render 

 doubtful the propriety of regarding it among the filaripc- 

 or spiroptene; but until further information is had the writers 

 feel that the general features warrant a tentative retention 

 among the spiropterae, and would propose the specific name 

 of Spiropiera iguanae. 



Dispharagus ardece, n. s. (Plate X, Figs. 4 to 6). 



The following description is based upon a single female 

 specimen (Path. Hist., 1681; No. 65, Synopsis, this journal) 

 obtained from a North American blue heron, Ardea herodias, 



