56 PROCEEDINGS OF THE NATIONAL MUSEUM vol.70 



the sketch, which continue for the remainder of the length, about 

 two-thirds of the total length, except where interrupted at one place, 

 where about four segments are elongated and wedge-shape. The 

 genital pores are unilateral. They are surrounded by a strong mus- 

 cular cloaca, and are situated toward the anterior end of the prog- 

 lottis. Dimensions of a specimen mounted in balsam: Length 42 

 mm. ; breadth of scolex 0.47, of sucker 0.28 ; length of posterior seg- 

 ment 0.10, breadth 0.63. 



Anatomy of 'proglottis. — The genital cloaca has strong muscular 

 walls; at the posterior side of the cloaca the cirrus and vagina open 

 near together. The cirrus pouch is cylindrical and passes anterio- 

 mediad from the genital pore. The vas deferens is voluminous at 

 the median end of the cirrus-pouch, and a part of it is enclosed in the 

 cirrus-pouch. The number of testes was not determined, but there 

 appeared to be as many as 25 in some transverse sections of imma- 

 ture proglottides. The vagina is nearly the same size and shape as 

 the cirrus-pouch and lies nearly parallel to it on its ventral side. It 

 extends a little nearer to the median line than the cirrus-pouch and 

 appears to act, for the most part, as a seminal reservoir; the germ 

 duct arising from its inner end is short and sinuous. It was traced 

 in transverse sections of immature proglottides to the dorsal side of 

 the ovary and the poral border of the vitelline gland. The ovary is 

 situated in the antero-median region, and both it and the vitelline 

 gland are lobed. The ovary appears to be a single but finely lobed 

 gland, and the vitelline gland, a much smaller and more compact 

 organ, lies just behind the ovary on the median line. 



In one series of transverse sections the longitudinal muscle layer 

 was poorly developed. Another series was made through a region 

 of immature proglottides. In these the fascicles have a somewhat 

 two-layered arrangement, and the inner fascicles are as a rule larger 

 and contain coarser fibers than do the outer fascicles (fig. 187). 

 Circular muscles were not seen. 



The relatively small dorsal and ventral excretory vessels lie near 

 together except when, on the poral side, they are separated by the 

 cirrus-pouch and vagina. 



Some of the sections contained large numbers of calcareous bodies. 



RECORD OF COLLECTIONS 



Gavia iinmer: 



(U.S.N.M., Helm. Coll. 7889 (type).) 

 1911, July 22. — Strobiles long and filiform; only two scoleces 

 seen, but fragments of strobiles aggregating 70 centimeters 

 found; all filiform and practically of the same diameter 

 throughout. 

 1911, July 24.— Five. 



