216 



A. E. Verrill — North American Cej^halopods. 



The long tentacular-arms agree very closely with those of A. 

 Harveyi (No. 5) in form and in the arrangement of the suckers on 

 the 'club.' When fresh they measured 914-4'™ (.30 feet) in length 

 with a circumference of about 12-7''" (5 inches), except at the enlarged 

 club, which was 20-32'"'" (8 inclies) in the middle. But when first 

 examined by me they had shrunk to 731 •o'"' (24 feet) in length, and 

 the circumference of the slender portion was to 10'™; that of the 

 club was 15-24^"' (6 inches). At that time the 'club' was 77-47"" 

 (30-5 inches) long; that portion bearing the larger suckers was 

 48-26'^'" (19 inches); the wrist or portion bearing the smaller and 

 partly smooth -rimmed suckers and tubercles was 15 •24'^™ (6 inclies) 

 long ; the terminal portion, bearing small denticulated suckers was 

 22-86'='" (9 inches) ; the breadth of the front of the club was 7-62'="' 

 (3 inches). The terminal portion had a strong cai-ina-like membrane 

 or crest along the back, and was here 5'"' (2 inches) wide, from front 

 to back. 



The large suckers (Plate XVII, figs. 1, la) of the tentacular-arms 

 are nearly circular in outline, and ai-e broad, depressed, little ob- 

 lique, constricted just below the upper margin, and then swelled 

 out below the constriction to the base. The calcareous ring is 

 strou"-, white, and so ossified as to be somewhat rigid and bone-like. 

 The margin is surrounded by numerous (about 45 to 50) nearly equal, 

 acute-triangular teeth, sometimes separated by spaces equal to their 

 breadth, at other times nearly in contact at their bases ; their edges 

 are so bevelled as to be sharp ; while there is a triangular thickening 

 in the middle of each, at base. A Avide, deep and concave groove 

 extends entirely around the rim a short distance below the margin ; 

 below this the lower part of the rim is somewhat, expanded and 

 irregularly plicated, varying in width. The largest ring studied by 

 me measures 3 1"""' in its greatest diameter externally; the aperture 

 is 26""" and 23"'"' across its longer and shorter diameters ;* greatest 



* This specimen is somewhat warped, by drying, so that the aperture is not so 

 circular as when fresh. 



