474 



A few Aveeks followiiif^ the expulsion of that specimen a second 

 one was dislodged, without much difficulty, from the same iiulividual. 

 This second specimen, which had been kept in alcohol sometime 

 before I received it, is in many respects more noteworthy than the 

 first. The main chain is 7.784 metres in length and contains 093 joints. 

 The remaining portions of the worm in my possession, mostly from the 

 caudal extremity, measure 0.4ü9 metres in length and contain 34 joints, 

 thus giving the worm a total length of 8.253 metres, exceeding the 

 former specimen, as actually measured, by (».798 metres. The number 

 of joints (727) is considerably below the number allowed by most au- 

 thorities to a much smaller worm. 



• The smallest segment measiu'es 1 mm in breadth, and is 2 mm 

 long. The largest measures 4.5 mm transversely, and has a length of 

 31 mm. Throughout the chain the length of the segments is ahvays 

 greater than the breadth. The flat surfaces of many of the joints, parti- 

 cularly those of the middle third of the worm, are marked by sub- 

 parallel, longitudinal grooves and their lateral margins have a wrinkled 

 or scalloped appearance. 



/; 



-<ULa 



'<r' 



Fig. 1. Fig. 2. 



Several of these joints have a thickness of 2 mm. Towards the 

 caudal extremity the joints are many of them very much constricted 

 anteriorly : beyond this constriction they gradually increase in breadth 

 until near their posterior end, when they again become somewhat 

 smaller. In these flask-shaped joints, one of which is represented by 

 figure 3, thé genital pore is frequently at the widest part of the joint, 

 and is always situated in the lower half of the lateral margin. 



The largest number of successive joints having their genital open- 

 ing on the same side is twelve. Of this series the extreme posterior 

 one has a genital pore on each lateral border, the two being placed 

 nearly opposite each other. 



Supernumerary joints are not infrequent in this specimen of Tae- 

 nia saginata, four examples occurring in the principal chain, two of 



