362 T. B. ROSSETER ON THE ANATOMY OF DICRANOT^NIA CORONULA, 



again examining my specimens, that these wavy, undulating cords 

 are nerve cords. Thus their connection with the annular rings, 

 and consequently the palmate bodies, points to the fact that 

 the latter are ganglionic bodies — supra-oesophageal ganglia — and 

 that the annular cords are a series of nerve-centres. This con- 

 clusion is more accentuated because by careful focussing ganglionic 

 thickenings or processes are traceable on these annules, but their 

 terminative fine nerve cords are untraceable in the surrounding 

 tissue, although I feel convinced they proceed to the muscular 

 structure of the suckers. A much fi.ner nerve cord proceeds 

 from the lateral cords, and runs dorso-ventrally on the posterior 

 margin of the proglottis. 



The secretory vessels have defied all my attempts to satis- 

 factorily elucidate them, or trace their ramifications, excepting 

 occasionally in isolated segments, but this has been of such an 

 unsatisfactory character that I pass them over, reluctantly, 

 without further comment. 



The chalk corpuscles (Fig. 4) are either globular or ovate. In 

 the former case they have a diameter of 0*003, and in the latter 

 of 0*007 mm. The whole strobila is thickly studded \vith them, 

 but they are more conspicuous in the neck and early segments. 



Part 2. — The Male and Female Generative Organs. 



Dujardin's description of the male genital organs runs thus : 

 "Orifices genitaux unilateraux; penis long de 0*06 mm. a 0*12 

 mm., large de 0'03 a 0*053 mm., mais pouvant se gonfler 

 jusqu'a 0*08 mm., forme d'un large tube membraneux, herisse 

 de tres petites epines, et pouvant rentrer par invagination." 



By this it will be seen that the only descriptive portion of the 

 male genital tract given by Dujardin is that which we now 

 designate as the "Cirrus" and "Cirrus-pouch." Krabbe's * 

 description is even more brief : " Aperturse genitalum secundae ; 

 Longit penis 0*11 mm., latit 0*041 mm." Railliet's work on this 

 tape-worm I am unacquainted with, but Dr, Stiles t says that 

 the adult form of this Tsenia is very superficially described, and 

 he queries the internal anatomy. I am led to the conclusion, 

 by these remarks of Dr. Stiles, that Kailliet's description is 



■* Bidrag til Kundskab om fuglens Baendelorme, 1869. 

 + Tape-worms of Poultry. Washington, U.S.A., 1896. 



