71 



On a side view the shell is gently carved downwards on approaching the 

 a,pex. 



A specimen twentj-four lines in length on the ventral side is eight and 

 one-half lines wide and six lines in depth at twenty lines from the apex. 

 Occurs in the red limestone at Smith's Sound, Trinity Bay. 



Fig. 40 Fig. 41. 



• Fig. 40. Agraulos iocialis. The head without the moveable cheeks. The glabella is too 

 distinctly defined in this figure. ' 



Fig. 41. Agraulos sirenuus. 



Agraulos socialis. (N. sp.) 



Description. — Head (without the moveable cheeks) semi- elliptical or 

 conical, width at the base a little greater than the length, gently convex. 

 Glabella conical and (including the triangular projection backwards from 

 the neck-segment) about two thirds the whole length of the head, neck- 

 furrows all across but obscurely compressed ; neck-segment with a trian- 

 gular projection backwards, terminating in a short, sharp spine. Fixed 

 cheeks, gently convex ; front margin sometimes with a portion in front of 

 the glabella thickened. Eyes of moderate size are situated on a line 

 drawn across the head at about the mid-length, distant from each other 

 about the length of the head. Surface nearly smooth. 



In small perfect specimens no trace of glabellar furrows can be seen 

 but in some of the large ones four or five obscure furrows are exhibited. 



The largest specimen seen is six lines in length and seven in width. It 

 occurs at Chaj^el Arm, Trinity Bay. 



Fig. 41. 



Agraulos sirenuus. (N. sp.) 



Description. — Head (without the moveable cheeks) irregularly quadran- 

 gular, broadly rounded in front. Glabella rather strongly convex, conical, 

 variable in its proportional length and width, either smooth or with several 

 obscure impressions on each side representing the glabellar furrows ; neck 

 segment with a strong triangular projection backwards ; neck furrows all 

 across but usually obscurely impressed. In some specimens the front of 

 the head has a thick, convex marginal rim separated from the front of the 

 glabella by a narrow groove. In others this rim is scarcely at all 



