ART. 7 CESTODE PABASITES OF BIRDS LINTON 55 



1908, September 1. — Several fragments of strobiles, three 



scoleces. 

 1913, May 7. — A few fragments of strobiles. 

 1913, May 14. — Fifty-two; maximum length about 16 mm. 

 1913, May 15. — Sixteen strobiles, small; two with scoleces. 

 1913, May 16. — Five, maximum length 36 mm. 



1913, May 20. — Three small strobiles, no scoleces. 



1914, September 9. — Six, length about 12 mm., scoleces missing. 

 1914, September 23. — Small pieces of strobiles, no scoleces. 

 1922, July 17. — Three hundred, more or less; longest, in sea 



water, about 20 mm. 

 U.S.N.M., Helm. Coll. 7888 (type). 



VAUPORA PARVISPINE, new species 



Figures 182-187 



Scolex. — Subject to some variation due to different degrees of con- 

 traction, but usually broader than long with relatively large suckers; 

 rostellum not seen fully everted, but evidently tapering and en- 

 larging but little at the tip ; hooks, about 20, appear to be in a single 

 circle, and of the same size and shape, length 0.010 to 0.012 mm. 

 Average breadth of 7 scoleces mounted in balsam was 0.50, length 

 0.29, diameter of sucker 0.28. 



Strobile. — The neck is short and of varying breadtlis, depending 

 on the conditions of contraction. In some cases it is as broad imme- 

 diately behind the scolex as the scolex itself; in others there is a con- 

 striction behind the scolex followed by an abrupt enlargement, 

 which may be as broad as the scolex and of about the same length ; 

 in some cases the region of first proglottides is as broad as the unseg- 

 mented portion, or neck; in others it is much narrower. In most 

 cases the anterior end of the strobile is characterized by having the 

 proglottides closely crowded. There is often considerable variation 

 in the shape of the proglottides in different regions of the strobile. 

 The most usual shapes, perhaps, are those shown in figure 184, 

 but portions of the same strobile may have the proglottides 

 more or less campanulate or cuneate. Thus, in the strobile of 

 which figure 182 is a sketch of the scolex, the condition shown in 

 the sketch is maintained for a distance of about 1 mm., the 

 length of the segments about 0.04 mm. This is followed by a short 

 portion in which the segments are closely crowded and under 0.03 

 mm. in length. Following this the segments lengthen and assume 

 outlines like those in figure 184. Then come some half dozen seg- 

 ments that are wedge-shape; a typical segment measured 0.49 mm. 

 in length, breadth at anterior end 0.14, at posterior end 0.30. This 

 is succeeded by a succession of segments much like those shown in 



