174 
with those from Stewart Isl. (— excepting only that the coloration 
is somewhat lighter —) that there can be no doubt but that they 
must be referred to the same species. 
More doubtful is the specimen dredged at Three Kings Isl., 
ca. 65 fathoms (5T.15). In this specimen the dorsal plates are 
broader, more angular than in the type, as seen from a comparison 
part of oral side ; 2, 4 and 5. base of arm, dorsal side, with part of the disk. lo/i. 
of fig. 36 with fig. 35.3- 5. Also the oral shields are more rounded, 
and the colour is much lighter, nearly white. Whether these dif¬ 
ferences indicate this form to be a separate species or only a 
variety of P. gracilis cannot, of course, be decided from the single 
specimen in hånd. For the present I must simply refer it to P. 
gracilis; but if the characters pointed out prove to be constant,'I 
should think it a distinet species. 
From Pectinura cylindrica the present species is very well di- 
stinguished, especially through the character of the dorsal plates, 
