38 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 55, 



meat inspection in this and other countries indicates that this is 

 a fairly common tapeworm of dogs, and possibly of other carni- 

 vores, that has somehow been overlooked until Ransom (1913) called 

 attention to it. It is quite possible that it has been confused with T. 

 hydatigena^ though the macroscopic and microscopic differences be- 

 tween these forms are considerable and very evident when once 

 pointed out. The distinctive feature in this species is the crossing 

 of the ovary by the vagina on its way from the segment margin to 

 the interovarian field. 



TAENIA KRABBEI Moniez, 1879c. 



SpecJ-fic diagnosis. — Taenia: The head is very small, about 500 fx 

 in diameter, presenting a generally spherical appearance when 

 viewed from the side and a square outline when viewed en face. 

 The rostellum bears a double crown of 26 to 34 hooks. The large 



/2omm. 



Fig. 40.— Taenia krabbei. Large and small hooks. 



hooks (fig. 40) are 148 to 170 [x long. The blade is of moderate 

 curvature; the handle is strikingly polymorphic, either straight, 

 curved in a simple curve, with the convexity of the curve dorsal or 

 ventral, or wavy, may have its sides approximately parallel or may 

 taper or thicken toward the distal extremity, may be slightly or 

 deeply notched on the dorsal border or not at all notched ; the guard 

 is generally cordiform to oval. The small hooks are 85 to 120 jx 

 long. They have a blade of strong curvature; the handle is tapering, 

 straight or somewhat curved, but in either case with a tendency to 

 curve dorsally at the tip; the guard is cordiform to oval in lateral 

 view and has usually a slight median groove. The suckers are in- 

 conspicuous. The neck is narrow and distinct and appears to be 

 about 1 mm. long in the cotype specimen. The strobila (fig. 41) at- 

 tains a length of over 26 cm. and a maximum width of over 1 cm. 

 All segments, except the few (7 or 8) terminal gravid segments are 

 very much wider than long, segments 8 mm. wide being about 1 



