AKT. 7 CESTODE PARASITES OF BIRDS LINTON 59 



vitelline gland is also lobed but the lobes are shorter and blunter 

 than those of the ovary. The uterus in ripe proglottides occupies 

 the greater part of the interior of the proglottis, the ova lying in 

 several rounded masses, showing that the uterus is more or less 

 lobed. 



The sections which were made proved to be all of ripe proglottides. 

 In these the musculature appears to be comparatively weak. The 

 longitudinal muscles were represented by an outer layer of very 

 small fascicles which is continuous, except where broken by the geni- 

 tal ducts. There are also a few small fascicles of an inner layer of 

 longitudinal muscles in the median region of the proglottis. 



The two ventral longitudinal excretory vessels are relatively large ; 

 the dorsal vessels, while somewhat variable, are very much smaller 

 than the ventral vessels. In some sections they are minute and diffi- 

 cult to recognize. Usually they lie near the ventral vessels on the 

 median side. 



RECORD OF COLLECTION 



Mania americana^ new host : 



1914, February 26. — Six fragments of strobiles, maximum length 

 about 30 mm. The broadest of these fragments measured in 

 formalin, 4.5, the narrowest about 2.5 mm. 

 (U.S.N.M., Helm. Coll. 7891.) 



GYROCOELIA MILLIGANI. new species 



Figures 188-193 



The material upon which this description is based consists of one 

 slide containing one scolex and fragments of strobile aggregating 

 about 24 mm., one slide of frontal, one of sagittal, and two of trans- 

 verse sections. 



Scolex. — Broader than long, suckers a little longer than broad; 

 rostellum enlarged at the tip, hooks missing; the extended rostellum 

 and its sheath form a pestle-shaped structure. Diameter of scolex 

 0.22 mm., of sucker 0.11, of rostellum at middle 0.042, at apex 0.056; 

 distance from base of sheath to apex of rostellum 0.22. 



Strobile. — The neck is short and the proglottides begin abruptly; 

 posterior breadth of proglottides greater than anterior, making the 

 lateral margins of the strobile strongly serrate. Genital pores 

 irregularly alternate at about the middle of the margin. There is a 

 tendency in parts of the strobile for the genital pores to be at the 

 summit of a papillary projection of the lateral wall of the proglottis. 

 The cirrus-pouch is somewhat fusiform, with the median end taper- 

 ing to a blunt point, producing in some cases a conical rather than 

 a fusiform shape. In mature proglottides the length of the cirrus- 



