PHOLOE MINUTA. 439 



observes, are of a yellowish-brown colour, dusky along the sides. The centre of the 

 dorsum is uncovered by the scales. Posteriorly are two slender, subulate styles. 



Proboscis 1 forms a short muscular organ with teeth, as in the Sigalionidae (biting to 

 the left), and nine short but distinct papillae along each arch. Moreover in extrusion, 

 just behind the lateral furrow separating the dorsal and ventral arches, are two papillae. 

 A median and two lateral bosses (elevations) are also present in the basal segment when 

 viewed from the dorsum. 



Scales (Plate XXXIY, fig. 17). — The first pair in the variety inomata are somewhat 

 rounded, as if an isosceles triangle had its angles smoothly removed. The scar for 

 attachment is situated nearer the posterior than the anterior border. The latter has 

 numerous short clavate cilia along its edge — to the number of about fifteen, while the 

 posterior border has about nine longer cilia, somewhat moniliform in outline from 

 constrictions. The surface of the scale anteriorly has also a row of cilia internal to that 

 along the border, and a few are scattered in the area in front of the scar, All the cilia 

 have traces of palpocils at the tip. Only the inner border of the scale is smooth. 



In contrast with the first scale of Pholoe minuta, Fabr., from Greenland, the fore- 

 going has fewer cilia. Thus there are upwards of forty along the anterior border of the 

 arctic form, and twelve, proportionally shorter than in P. inomata, along the posterior 

 edge. Moreover these organs are more numerous on the surface in front of the 

 scar. 



The shape in the second pair becomes transversely elongated with an anterior 

 incurvation. The moniliform cilia along the posterior border are more numerous, while 

 the smaller along the outer edge are fewer ; and the same may be said of those on the 

 surface. 



The succeeding scales are irregularly rounded, with a somewhat even external 

 border, which has moniliform cilia, while those along the posterior edge are few and 

 widely separated. The scale is areolated, especially towards its inner border, which, 

 along with the anterior, is smooth. 



The posterior scales are more elongated transversely and have fewer cilia (about six 

 of the large moniliform kind), both on the abbreviated external border and on the 

 posterior edge. The scar is nearer the anterior than the posterior edge. 



In comparing the larger broad anterior scales with those from Greenland and 

 Canada (Plate XXXIY, fig. 18) comparatively little difference is observable, both having 

 from eighteen to twenty-three moniliform cilia externally. 



On the whole, therefore, the view that P. minuta and P. inomata are the same 

 forms is borne out by the scales. 



In the variety eximia the first pair of scales have a similar shape to those of the 

 type, being irregularly rounded, and, from the size of the examples, smaller than in the 

 latter. The outer border has a series of longer cilia, fewer in number but similar in 

 structure. They encroach somewhat on the anterior border, or rather some of the 

 isolated cilia scattered over the surface near the edge project beyond it, but none of the 

 smaller clavate cilia so characteristic of the type minuta are present on this edge. 

 These large isolated cilia occur both external and posterior to the scar for attachment. 



1 Described from an arctic example. 



57 



