276 H. N. MOSELEY. 



parent oval spaces entirely free from pigment occurs and in these 

 the eye-spots lie (PI. XX, fig. 2). 



In the structure of the eye-spots and histology generally the 

 New Zealand Planarian closely resembles Bipalium and R. rhyn- 

 chocleynus. 



Observations on the living animal and fresh structures were 

 made on two small living specimens of another species obtained 

 at Wellington. 



Strong cilia are present on tlie ventral surface of the body, as 

 was seen by examining sections of the fresh animal in saliva and 

 by applying the test of a small foreign body as in Geoplana ; but 

 cilia if present on the dorsal surface are very small and could not 

 be detected either by direct observation or experiment. 



Numerous rod-bodies were observed to be shot out of a fresh 

 section just as in Geoplana, but the rod-cells were not isolated suc- 

 cessfully. The rod-bodies, which are long and thread-like when 

 shot, are well preserved in reagents and are to be seen hi sections 

 set up in Canada balsam, the epidermis being in some places 

 covered with a felt of them. 



Abundance of pigment of the same nature as that of Bipalium 

 is present. Much of it often occurs deep in the tissues beneath 

 the external systems of muscles (PI. XX, fig. 8, p.) 



The arrangement of the superficial muscles is peculiar, and 

 diff'ers from that in other Land Planarians, probably even from 

 that existing in the American Geoplanas. A thiu layer of cir- 

 cularly directed muscular fibres, the external circular muscular 

 coat, is present as in lihynchodemus and Bipalium, situate im- 

 mediately beneath the epidermis, and beneath this lies a layer of 

 longitudinal muscles disposed in a series of bundles of fibres 

 homologous with the external longitudinal coat of Bipalium. 

 This set of longitudinal muscles is very little developed on the 

 dorsal region of the body, but excessively so over the whole 

 ventral region or sole, as will be seen from Pi. XX, fig. 8. This set 

 of muscles is developed nearly uniformly over the sole, and there 

 is no indication of any specialisation of an ambulacral line. 



The external longitudinal muscles are evidently in this Plana- 

 rian the main muscles of locomotion, and take upon themselves 

 a great part of the function which in Bipalium is performed by 

 more deeply situate longitudinal fibres. 



An enlarged view of the arrangement of the muscular fibres is 

 given in PI. XX, fig. 9, from which it will be seen that the bundles 

 of external longitudinal fibres are separated by radiating fibres 

 which pass outwards to join the external circular layer. A layer 

 of internal transverse or circular fibres succeeds an interval 

 occupied by radiating fibres only, and scattered over this are 



