302 T. B. ROSSETER ON HYMEXOLEPIS FARCIMIXALIS. 



inent of the early uterine segments, each individual proglottis is 

 easily detached, transversely, from the strobila, and can be tilted 

 and stood on its anterior transverse border like a long galley 

 resting on its keel ; and with careful manipulation a series of 

 proglottides can thus be arranged on a slip of glass and mounted 

 in glycerine, using Bell's cement and several final coatings of 

 gold-size. A slight pressure of the cover-glass flattens out the 

 segments, and the anatomical structure can thus be studied. It 

 is better, in the first instance, to fix and stain the whole worm 

 before disassociating the segments. Fig. 1, d, is not a microtome 

 section, but a segment so flattened out under a cover-glass. In 

 the later uterine segments this is an impossibility, owing to the 

 •elongation of the lateral borders. 



So much has been written by various helminthologists on the 

 nature of the cuticle and the structure of the proglottides of 

 Oestoidae that I think this is not the place to discuss them in 

 detail. It will suffice to say respecting T. farciminalis that the 

 longitudinal muscles are enclosed apparently in a structureless 

 membrane in fascicles or bundles. There are approximately 

 thirty lar^e and eighty-eight small fascicles running dorsally 

 and ventrally through each segment. Of the former each 

 fascicle consists of from ten to twelve muscle bands with a 

 total diameter of O057 mm. In the latter the fascicle has 

 a diameter of 0*027, and contains but four muscle bands. The 

 smaller fascicles are posterior to the latter (Figs. 1 d and 9). 

 Of the transverse muscles other than the fibrous net-work there 

 is a series of muscles which require more than a passing notice. 

 In the strobila, as the genital organs are developed, there is 

 evolved a series of eight to ten transverse muscles grouped in 

 the extreme anterior portion of the segment, and running both 

 ventrally and dorsally from each lateral border. In these early 

 hermaphroditic segments is also developed in connection with 

 these muscles on either lateral border a scutiform cartilaginous 

 body, to which the muscles are firmly attached (Figs. 11 

 and 12). Its anterior portion deflects obtusely for a short 

 distance along the anterior transverse border. The attachment 

 is formed by the terminative end of each muscle spreading itself 



