10 Prof. M'liitosli's Xutes from the 



hue, and tlic exposed parts are covered with minute sand- 

 particles. 



An allied species (AB) occurred under stones between 

 tide-marUs both in Guernsey and llenn, with only five pairs 

 ot" anterior bi'istles, and shows dilTcrenccs from both 

 Putainilla renij'onnis and P. torelli. The cephalic plate lias 

 a narrower collar than in P. renifunnis, a feature well 

 marked in the small, pointed, ventral lobes. The edge is 

 snu)oth at and near the mid-dorsal groove, then at each side 

 is a lateral flap which trends to the hunellie on the ventral 

 surface. These lamelUe are smaller than in Sabeila pavonina. 

 Besides the small lamelhe which [U'oject ventrally, the niaigiu 

 is incurved at the middle line. 



The body is comparatively small, about | of an inch 

 in length, and the number of segments is between sixty and 

 seventy. It is rounded dorsally, with the exception of the 

 region of the dorsal groove anteiiorly, slightly Hattened 

 vcntrally where a median furrow runs from the middle of 

 the sixth scute backward to the tail. The anterior region 

 is composed of tive bristled segments and apparently the 

 same numl)er of uncinigerous rows. Posteriorly it tapers to 

 a somewhat pointed tail. The branchive seem to be com- 

 paratively short — like those of Potamilla reniforniis, and the 

 pinnee of moderate length or rather short, whilst the terminal 

 filament is long, large, and is often in screw-coils, thus 

 diH'ering essentially from those of P. reniforniis, P. torelli, 

 ami P. ne(jlecta. Moreover, there are no ocelli on the 

 filaments, and none on the first segment or on the tail. 



The first region of the body has only five pairs of seti- 

 gerous processes. Each bears a tuft of comfjaratively short 

 bristles, the tips of which, unfortunately, had for the most 

 part disappeared — probably from their brittle nature as well 

 well as from rough usage. Those which are perfect have 

 shafts which slightly dilate from the base to rather beyond 

 the middle, then diminish at the neck and swell out at the 

 origin of the wings, tapering thereafter to a somewhat long 

 attenuate extremity. At the upper edge of the fascicle are 

 the longer and more slender forms, the shafts of the others 

 being thicker. No trace of spathulate tips is observable. 

 The anterior hooks form a single row, and present a sharp 

 main fang, the rest of the anterior face of the crown above 

 it (about half the extent) being finely serrated in lateral 

 view. As usual in such hooks, when the crown is examined 

 from the front, this region is densely spinous. The posterior 

 outline is more or less straight below the forward bend at 

 the crown, whilst the anterior — also straight immediately 



