1914] A New Cestode from Amia Calva L. 91 



der Proglottis entspringen und sich z. T. am Hinterende derselben den 

 Biindeln der ausseren Langsmuskeln beigesellen, z. T. an der freien 

 Hinterflache der Proglottis inseriren. DIese Muskelfasern werden nur 

 dort vermisst, wo entweder eine aussere Gliederung fehlt oder die einzel- 

 nen Glieder nicht jene, fur die jugendliche Proglottis charakteristische, 

 regelmassige Form eines abgestumpften und seitlich abgeflachten Kegels 

 besitzen." 



The c u t i c u 1 a r muscles are arranged in the unjointed portion 

 of the strobila in the typical manner, while anteriorly they are modified 

 somewhat in relation to the great development of the appendages. The 

 outer cuticular fibres follow the cuticle closely (Fig. 7) even on the outside 

 of the auricles and are diminished in number and size only opposite the 

 bands of minute spines (Fig. 8). The longitudinal fibres, on the other 

 hand, are largest and most numerous on the outside of the appendages 

 to the tip of which they extend, while only a very few appear on the in- 

 side, being connected with those of the following proglottis after passing 

 forward around the auricular pockets. This description applies also to 

 the scolex in which, however, all of the cuticular musculature is not so 

 well developed. 



The musculature of the scolex is essentially the same 

 as that of the anterior proglottides, but there are in addition two sets 

 of fibres which do not appear in the latter. Furthermore, all of the mus- 

 cles are better developed, that is, more numerous and larger, as one 

 might expect in this portion of the strobila, specially differentiated for 

 adhesion. 



The coronal fibres are first seen about yo/x from the summit, after 

 which they become more numerous, especially opposite the posterior 

 boundaries of the longitudinal arcuate fibres (vide infra) then again 

 opposite the appendages into which many of them pass as in the foremost 

 joints. Their arrangement is shown in Fig. 34, a section through the 

 middle of the scolex. The other series of coronal or transverse muscles 

 in the scolex, the obliquely decussating group, are related to the auricles 

 as are those in the proglottides immediately behind, excepting that they 

 do not pass relatively so far forward at the edges or "walls" of the 

 bothria (Fig. 36) . A third series of transverse muscles, one of the two sets 

 mentioned above, is composed of large fibres arranged concentrically to- 

 wards the centre of the scolex from the edges of the bothrial walls (Fig. 34) , 

 which they protract, thus helping to deepen the bothria during attachment. 

 They are situated in the middle third of the scolex, not extending beyond 

 the limits of the bothrial depressions. These fibres interdigitate some- 

 what laterally and intermingle dorsoventrally with the attenuated edges 

 of the sagital fibres. They are quite homologous with the four groups 



