Volume /.] September, itjoo. \_A?o. 6. 



BIOLOGICAL BULLETIN. 



ABNORMALITIES IN THE CESTODE MONIEZIA 



EXPANSA. II. 



C. M. CHILD. 



I. Spiral Abnormalities. 



IN the cases described in this section spiral modifications of 

 the segmentation are present in greater or less degree. Asso- 

 ciated with these are often found examples of partial division 

 resembling those described in Part I, Biological Bulletin, 

 Vol. I, No. 5. Where these are closely connected with the 

 spirals they are shown in the figures and briefly described. 



Figs. 24, 26, 27, 30, 38, 39, are selected from a number of 

 different individuals. The other figures are all taken from the 

 single worm mentioned in Part I as possessing a very large 

 number of abnormalities. Figs. 34 and 35, being taken from a 

 point nearer the anterior end of the chain, where the size is 

 much less than in older proglottids, are magnified about fifty 

 diameters, the other figures about twenty. 



For terms used in the description, the structure of the normal 

 segment, etc., the reader is referred to the first paper (Biol. Bull., 

 Vol. I, No. 5). 



Figure 24. 



The principal feature of this figure is a case of partial 

 division, which is in reality a short spiral. The proglottid 

 a shows at the right a very short furrow extending from the 

 edge a short distance over the upper surface and ending free. 



261 



