327 



glottis are connected to the corresponding ganglia of the preceding 

 and of the following proglottides. I have, therefore, named them pro- 

 visionally the dorsal and ventral connectives (Fig. 1 cont.d.dx; con't. 

 d.s etc). However, I have not been able to trace this connection 

 satisfactorily except in one case (the left ventral connective, Fig. 1 

 con't.v.s.), because it is exceedingly difficult to distinguish the nerve 

 from the longitudinal musclefibres among which it is located. The 

 probable connections are indicated in Figure 1 by broken lines. There 

 is the greater reason for believing in the continuity of these nerves be- 

 cause they are without doubt the equivalents of the two dorsal and two 

 ventral nerves described by Niemiec (1885) as occurring in Taenia 

 coenuruSj T. serrata and other Cestodes. I have been able to demon- 

 strate in the scolex of both of these Cestodes — Moniezia expansa and 

 M. pianissima — the presence of these four longitudinal nerves in 

 addition to the two large lateral nerve trunks. They occupy the posi- 

 tion assigned to them by Niemiec, which corresponds well with that 

 of the connectives arising from the dorsal and ventral ganglia of the 

 commissures ; but I have not yet traced continuously the passage of 

 these nerves through the neck region till they merge in the supposed 

 connectives. 



Cambridge, May 15, 1896. 



Bibliography. 

 Blochmann, F., 1895. Über freie Nervenendigungen und Sinneszellen bei 

 Bandwürmern. Biol. Centralb. 15. Bd. p. 14 — 25. 1. Jan. 



Niemiec, J., 1885. Recherches sur le System Nerveux des Taenias. Recueil 

 Zool. Suisse, torn. II. p. 589—648. 



Rath, O. vom, 1893. Beiträge zur Kenntnis der Spermatogenese von Sala- 

 mandra maculosa. Zeitschr. f. wiss. Zool. Bd. 57. p. 97 — 185. 



Rath, O. vom, 1895. Zur Conservierungstechnik. Anat. Anzeiger. 11. Bd. 

 p. 280—288. 



Zernecke, E., 1895. Untersuchungen über den feineren Bau der Cestoden. 

 Zool. Jahrbücher. Abth. f. Morphol. 9. Bd. Heft 1. p. 92—161. Taf. 8—15. 25. Nov. 



5. Beitrag zur Kenntnis der Gattung Myobia v. Heyden. 



Von S. A. Poppe in Vegesack. 



eingeg. 26. Mai 1896. 



Seitdem uns Claparède 1869 in seinen Studien an Acariden^ 

 mit dem schon 1781 von F. Paula von Schrank^ beschriebenen Pe- 

 diculus muris musculi, für den v. Heyden^ 1826 das Genus Myobia 

 schuf, und seiner Entwicklungsgeschichte bekannt gemacht hat, sind 

 folgende Arten desselben beschrieben worden: 



1 Zeitschr. f. wiss. Zool. 18. Bd. 4. Hft. 1869. 



- Enumeratio insector. Austriae indigen. p. 501. Tab. I fig. 5 — 7. 1781. 



3 Versuch einer system. Eintheilung der Acariden. in: Isis, 1826. p. 613. 



