170 Prof. M'lntosh's Notes from the 



papillee over the surface. The stout shafts of the bristles 

 have numerous spikes on the distal convexity. The terminal 

 piece is short and falcate and the edge is spinous. The 

 ventral cirrus is short and tapering. 



The proboscis forms a short muscular organ, with teeth, as 

 in the Sigalionidffi, biting to the left, and nine short but 

 distinct papillae along each arch. Moreover, in extrusion two 

 papillae are situated just behind the lateral furrow separating 

 the dorsal and ventral arches. A median and two lateral 

 elevations are also present in the basal region dorsallj. 



Thus far there are few divergencies; but when we come to 

 the condition of the scales in the several races, such variations 

 occur as have been thought worthy of specific distinction by 

 several authors. Yet the gradations from the Arctic to the 

 southern form appear to be of such a nature that it is deemed 

 prudent to adhere to the decision already mentioned, viz. to 

 make only one species. 



In the variety inornata of Dr. George Johnston the first 

 pair of scales are somewhat rounded, as if an isosceles triangle 

 had its corners smoothly removed. The scar for the elytro- 

 phore is situated nearer the posterior than the anterior border. 

 The latter has numerous short clavate cilia along its edge to 

 the number of about 15, while the posterior margin has about 

 9 larger cilia, somewhat moniliform in outline — from constric- 

 tions. The surface of the scale anteriorly has also a row of 

 cilia running within those on the border, and, besides, a few 

 are scattered over 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 thus smooth. 



In contrast with the first scale of the typical PhoJoe rninuta, 

 Fabr., from Greenland, the foregoing has fewer cilia. Thus 

 there are upwards of 40 along the anterior border of the 

 Arctic form and 12 proportionally shorter cilia than in the 

 var. inornata along the posterior edge. Moreover, these 

 organs are more numerous on the surface in front of the scar. 



The shape in the second pair in var. inornata becomes 

 transversely elongated, with an anterior incurvation. The 

 moniliform cilia along the posterior edge are more numerous, 

 while the smaller cilia on the outer edge are fewer, and the 

 same may be said of those on the surface. 



The succeeding scales are irregularly rounded and have a 

 somewhat straight external border, which has moniliform cilia, 

 while those along the posterior border are few and widely 

 separated. The scale is areolated, especially towards its 

 inner border, which, along with tlie anterior edge, is smootli. 



In comparing the large broad anterior scales with those 



