A. E. Verrill — North American Cephalopoch. 201 



margins are largest, flat, lanceolate, with sharply bevelled lateral 

 edges and acuminate tips ; those on the front margin are shorter, 

 narrower, acutely triangular, and in contact at their bases. On the 

 largest of these suckers there are forty-eight to fifty denticles. Some 

 of the suckers of rather smaller size («, Z>,) are more oblique, with the 

 outer side of the horny rings relatively wider and more incurved ; the 

 denticles of the outer margin are strongly incurved and decidedly 

 narrower and more acute than the lateral ones, which are broad- 

 triangular ; the inner or front deuticles are rather smaller, acute- 

 triangular, and usually inclined somewhat inward. Ou these there are 

 foity to forty-six denticles, No suckers of this specimen have been 

 found with the denticles rudimentary or wanting on the front edge, as 

 is frequently the case in those of A. princeps. Nor is there so much 

 contrast in the form and size of the inner and outer denticles of the 

 largest suckers as in that sjjecies. The rings of the smaller suckers 

 are still more oblique and more contracted at the aperture than those 

 of the larger ones, with the teeth more inclined inward, those on the 

 outside margin being largest. 



Measurements of suckers of short arms {millimeters). 



« (ale.) 6 (ale.) c (ale.) d(dry.) 



Transverse diameter, outside, 17 17 20 18 



Diameter of aperture, 1.3 10 16 14 



Breadth of horuy ring, back side, 7'5 9 8 7 



Breadth of horny I'ing, front side, .. . 3 .3 3-5 3 



Number of distinct denticles, 46 41 50 49 



The two long tentacular-arms are remarkable for their slenderness 

 and great length when comj)ared with the length of the body, Mr, 

 Harvey states that they were each 731-5"" (24 feet) long and 7"" 

 (2-75 inches) in circumference when fresh. In the brine and alcohol 

 they have shrunk greatly, and now measure only 411'5°'" (13*5 feet) 

 in length, while the circumference of the slender portion varies from 

 5-7'=™ to 7"25''"' (2-25 to o-25 inches). These arms were evidently 

 highly contractile, like those of many small species, and consequently 

 the length and diameter would vary greatly according to the state 

 of contraction or relaxation. The length given (24 feet) probably 

 represents the extreme length in an extended or flaccid condition, such 

 as usually occurs in these animals soon after death. The slender 

 portion is nearly three-cornered or triquetral in form, with the outer 

 angle rounded, the sides slightly concave, the lateral angles promi- 

 nent, and the inner face a little convex and generally smooth. 



Trans. Co.vn. Acad., Vol. V. 26 .January, 1880. 



