TWO NEW SPECIES OF CESTODES. 271 
may be compared, in the figure cited, with those of other and 
allied species (text-fig. 4, B,C, D). In the present species a 
delicate layer of transverse fibres forms the innermost layer of 
the cortex and separates it off from the medulla. Immediately 
outside of this is a layer of longitudinal fibres disposed in stoutish 
bundles separated from each other by considerable intervals, 
Outside of these again are scattered longitudinal fibres, which are 
here and there aggregated into small bundles of two or three 
fibres. The large internally situated bundles consist of 15-20 
fibres apiece. 
Text-fig. 4, B, illustrates a corresponding section through 
Linstowia amewee, which I have already described *, and which 
shows plain differences from Oochoristica nuarmose. 
For the purpose of comparison with these two species and to 
show the value as specific marks of the arrangement of the longi- 
tudinal muscles, I subjoin corresponding figures of a Linstowia 
from Hehidna (text-fig. 4, C) which may be ZL. echidne or L. 
semont (I have no means of deciding the point), and of Oochoris- 
tica (text-fig. 4, D), which is near to and possibly identical with 
O. wageneri, whose general anatomy has been described by myself 
lately r. In the former species (text-fig. 4, C) the longitudinal 
muscular layer is divisible, as in the other species, into two sheets, 
of which, as before, the innermost is the stronger. So much so, 
however, that the outer muscular sheath is reduced to a very few 
fibres. ‘The inner stronger layer is not by any means so well 
developed as in the last two species: the bundles are smaller, 
that is, they contain fewer fibres, and they are not by any means 
so distinctly marked off from one another as in Oochoristica 
marmose; they resemble more Linstowia ameive, a point of 
importance in view of possible generic identity. 
The last species represented in the figure (text-fig, 4, D) is 
quite unlike any of the others, in that there is not a definite two- 
layered disposition of the muscular fibres. There is simply one 
irregular layer of bundles of varying sizes, that is, containing a 
variable number of muscular fibres, which together occupy a good 
deal of the space which les between the subcuticular layer and 
the transverse muscular layer. It will be observed, however, 
that, on the whole, the larger bundles lie to the deeper side of the 
cortical layer, those more superficially placed being smaller. On 
the whole, the arrangement of the longitudinal muscles in this 
species is more like that of Oochoristica marmose than of the 
other two species figured, by virtue of the size of the bundles. 
Butif we attempt to draw generic definitions from this character, 
it might perhaps be urged with equal force that the reduction of 
the muscles in Linstowia semoni sets that species apart from all 
the rest. In any case, it cannot be doubted that these muscles 
furnish very clear specific characters which have not been hitherto 
sufficiently represented in figures illustrating these two genera. 
* Supra, p. 264. 
iy eZee Se LOM 627. 
