No. 4.] BILLINrtS — P0P81LS OF NEWFOUNDLAND. 



475 



the length ; sides gently concave in the posterior two-thirds, and 

 slightly diverging from each other forwards ; anterior third and 

 front uniformly rounded. Neck segment with the margin con- 

 vex and projecting backwards. ;.u obscure tubercle, or rather, an 

 angular elevation in the middle, neck furrows .ill across. There 

 are four glabellar furrows; of these, the po.l'rior is strongly 

 marked and extends in a nearly straight liiu' all across; the 

 next two are linear, slightly impressed, extend inwards about 

 one- third the width of the glabella and arc gently curved back- 

 wards, but still almost at right angles to the sides. The anterior 

 furrow is short, extends inwards about one-fifth the width of the 

 glabella, and curves backwards at an angh? of about 45" to the 

 sides. The dorsal furrow around the glabella is very shallow. 

 The fixed cheeks arc triangular, nearly flat, with a small eleva- 

 tion, close U) the extremity of the posterior furrow. Front of 

 the head with a moderately convex marginal rim, almost in 

 contact with the glabella or separated therefrom by a narrovv 

 space. The eye-lobe starts from a point close to th<' side of tlH> 

 glabella and just opposite or a little behind the short frontal 

 furrow, and runs with ^ gently sigmoid curve (at fir>t convex 

 outwardly, and then concave) backwards and outwards to the 

 posterior marginal furrow, which it reaches at a distance fron» 

 the sides of the glabella, about equal to the length of the neck 

 segment. The facial suture leaves the side of the glabella a 

 little in front of the anterior furrow, and runs outwards, nearly 

 at a right angle, but with a gentle convex curve, to the margin. 



The surface is covered with fine rippled striae. These on the 

 marginal .'im are irregularly parallel with the margin ; on the 

 glabella they curve around the front, but further back, and on 

 the neck segment they have a rudely longitudinal direction, 

 curving outwards in crossing over the glabellar lobes. 



Length of the head of the largest specimen examined. <» 

 lines; length of the glabella, including neck segment, 5 lines; 

 width of glabella at the neck segment, IJ lines, at the front 

 pair of furrows, 3^ lines; width of the posterior margin of the 

 fixed cheek 3 lines ; length of the eye lobe, 4 lines. 



When compared with the species figured by 8alter and Hicks 

 the following diflfercnces become apparent: — A. Ilenrici, Salter, 

 has the eye lobes with a gently uniform curve outwards. In 

 A. SftUeri, Ilicks, the eye lobes are also convex and the glabella 

 proportionally longer, while the neck furrow "is the only one 



