282 H. N. MOSELEY. 



bundles of external longitudinal muscles are especially large in 

 the lateral regions of the dorsal and ventral surfaces of the body. 

 They are less fully developed at the actual lateral margins of the 

 body and about the middle line of both dorsal and ventral sur- 

 faces. The bundles on the dorsal surface are more fully de- 

 veloped than those on the ventral, the exact reverse thus here 

 occurring to the condition obtaining in the New Zealand land 

 planarian, the arrangement being, however, very like that occur- 

 ring in the Australian form of the group, 



A broad, pale band on the ventral surface of the animals 

 seems to represent an ambulacral line, but I have not found special 

 internal muscular structures corresponding with it. Possibly the 

 band is due to the presence of long cilia. In a transverse section 

 of the body a zone occupied only by radial muscular fibres, suc- 

 ceeds the layer of external longitudinal muscles internally. Within 

 this zone, in the ventral region of the body, is a mass of internal 

 longitudinal muscular fibres, irregularly disposed (Plate XX, 

 fig. 35, Urn) ; at the ventral edge of which mass is a row of 

 specialised bundles of longitudinal fibres, resembling those of 

 the external longitudinal layer (fig. 22, a) . This row of bundles 

 extends to;beyond the region of the ovary on either side. Some 

 transversely directed fibres intervene between the row and the 

 external longitudinal bundles in the region of the ambulacral 

 line (fig. 25, d). There 'seem to be hardly any longitudinal 

 muscles developed in the dorsal region of the body besides those 

 of the external layer. 



Strong bands of transversely directed muscles pass across the 

 body immediately above and below the digestive cavities, 

 strengthening their floors and roof (fig. 25, trm). These trans- 

 verse fibres, which must be regarded as representing the internal 

 circular muscular system, lap round the outer ends of the diver- 

 ticula with a few of their fibres, as seen in fig. 25. Strong vertical 

 fibres pass on either side of the main digestive canals and traverse 

 the uiterspaces between the internal longitudinal muscles to join 

 the radial fibres, with which they are continuous, in the dorsal 

 and ventral regions of the body. 



The lateral organs (Plate XX, fig. 25, .r) are very hke those of 

 Ehynchodemus in structure. The position of the oviduct with 

 regard to them is the same as in all other Land Planarians ; as is 

 also that of the testis. 



J'he digestive diverticula were observed to ramify very freely 

 in the fore part of the body, apparently to a greater extent 

 than they do in Rhynchodemus. 



