

[47] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 257 



The marginal suckers (Plate IX, fig. 10), alternating with the large 

 ones on the club, are very oblique, with the rings strong and very one- 

 sided, the height of the back being more than twice that of the front 

 margin. The aperture is not circular, the outer portion of the margin 

 being incurved or straight. The groove below the margin is narrow 

 and deep, especially on the sides, but only extends around the front 

 and sides, being entirely absent on the outer third of the circumference. 

 The denticles are about 22 to 24, slender, acute, not crowded, the most 

 of them being separated by spaces greater than their breadth at base. 

 The outer ones are strongly incurved ; those along the sides are curved 

 forward obliquely toward the front margin, while those on the front 

 margin point upward and sometimes rather outward. The denticles 

 are of nearly equal length, but those of the front margin are both more 

 slender and more acute ; they all have sharp, beveled edges and a 

 thickened median ridge or tubercle. The largest ring examined was 

 14™ in diameter; height or breadth of back side of rim, 8"' m ; of front 

 side, 3.5 mm . 



The small suckers, covering the last division of the club, are very 

 similar to the marginal ones last described, except that they are much 

 smaller and more delicate, with a narrower and less oblique rim. The 

 denticles of the inner margin are very acute, and point obliquely out- 

 ward and upward. Greatest diameter of the one described, 6 mm ; hight 

 of back side of rim, 4 mm ; of front side, 1.5 mm . 



The small terminal group of smooth rimmed suckers, seen in No. 5, 

 were not noticed, but they were not looked for specially. 



To this species I have also referred the specimen (No. 13) from Grand 

 Bank, Fortune Bay (see p. 12, where the general measurements are 

 given). Fortunately, Mr. Simms was able to obtain the jaws in pretty 

 good condition, and also one of the largest suckers of the tentacular 

 arms. These specimens were forwarded to me by the Rev. M. Harvey. 

 They had been dried, and the jaws, which were still attached together 

 by the ligaments, had cracked somewhat, but all parts were present 

 except the posterior end of the palatine lamina, which had been cut or 

 broken off. Although these jaws had undoubtedly shrunken consider- 

 ably, even when first received, they were afterwards put into alcohol 

 and have since continued to shrink, far more than would have been 

 anticipated, so that, at present, the decrease in some of the dimensions 

 amounts to 20 per cent., while even the harder portions have decreased 

 from 5 to 10 per cent, from the measurements taken when first received 

 by me.* When first reeeived, in 1875, the upper mandible measured 



* There is no reason to suppose that the shrinkage has heen any more in this case 

 than in the others, but I have not had an opportunity for making comparative meas- 

 urements from the same specimens when recently preserved, and again after long 

 preservation iu alcohol, except in one other instance (No. 5), in which a similar 

 shrinkage was evident. (See table of measurements, p 22.) 

 9. Miss. 59 17 



