95 



It thus appears that this specimen is of unusual size and that the 

 principal chain alone would make a very long worm. The joints are 

 not correspondingly increased in number, even after a fair alloAvance 

 has been made for those which are wanting at its anterior extremity, 

 but fall rather below the mean. 



At the caudal end of the worm the last 30 cm of the chain contain 

 12 joints, a striking contrast to the anterior 30 cm in which there 

 are 7 7. 



The smallest segment measures 2 . 5 ram in its transverse diameter. 

 The largest has a breadth of 5.5 mm, and is 29 mm long. At the an- 

 terior extremity of the chain the segments vary somewhat in shape, 

 but generally speaking they are at first broad and short, at 185 cm 

 from the head they become square, or nearly so, and finally in the last 

 356 joints the length exceeds the breadth. 



This specimen apart from its rather unusual length presents a few 

 points of special interest. 



One example of supernumerary joint is present in the long chain, 

 9 1 cm from the posterior end. 



This extra joint is somewhat heart-shaped, and measures 7.5 mm 

 in its longest diameter. Its inner border rests in a semicircular depres- 

 sion at one side of the chain, opposite the point of union of two adjoin- 

 ing segments of large size. Its free border extends some distance be- 

 yond the lateral margins of the two adjacent joints and terminates in 

 a slightly rounded point. On one side of this extra joint, a little an- 

 terior to the genital pore, is a straight superficial groove extending from 

 the inner border to the free edge. 



One of the shorter chains possesses a joint of somewhat peculiar 

 appearance. One of its lateral borders is comparatively straight, whilst 

 the other is marked at the centre by a rounded eminence. The breadth 

 of the joint at this point is 1 1 ram, whereas at the two extremities it 

 is only 6.5 mm. The interior of the joint is nearly filled by the geni- 

 talia. The porus genitalis opens upon the straight border, just beyond 

 the middle of the joint. 



One of the joints of the posterior extremity shows two genital 

 pores, but unfortunately the arrangement of the generative apparatus 

 cannot he seen with any distinctness. The two openings are situated 

 at very nearly corresponding points on each lateral border of the joint. 



The largest number of successive joints having genital foramina 

 on the same side is six. 



The structure of the adult proglottides, so far as I have examined 

 them, appears to be normal. 



Amherst, Mass., U. S. A. 



