[207] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 417 



brane has seven distinct angles. Arms rather long and strong; trape- 

 zoidal in section. The dorsal arms are considerably shorter than the 

 others; order of length is 1, 2, 4, 3; the third is but little longer than 

 the second pair; ventral arms decidedly more slender than the others. 



Ventral arms with four rows of. denticulated suckers (Plate XLY, tig, 

 lc), those of the two inner rows larger; lateral and dorsal arms with 

 two marginal rows of small suckers and two inner rows of larger in- 

 curved hooks, inclosed, except at the sharp tips, in muscular sheaths, 

 which have lateral basal expansions and short pedicels. (Plate XLY, 

 fig. lb.) Tentacular arms* long and strong, quadrangular; in my spec- 

 imen they reach back beyond the base of the fin; the club is large and 

 broad, with a long, narrow distal portion, having a strong dorsal keel; 

 in the middle are two very large, curved hooks (figs. 1, la), the distal 

 one smaller; proximal to these there is a row of five smaller hooks, de- 

 creasing proximally, and between these and the large hooks there is, on 

 one arm, a single small sucker, on the other arm a single sucker takes 

 the place of the proximal hook, while an odd, small sucker stands to 

 one side of the row; along the upper margin of the club there is a broad 

 band of small, denticulated suckers, on long pedicels, arranged in oblique, 

 transverse rows of five or six; this band of suckers is interrupted oppo- 

 site the large hooks; beyond the hooks a large group of similar small 

 suckers covers nearly the whole distal portion of the club (Plate XLV, 

 fig. 1); at the tip of the club there is a circle of small smooth suckers; 

 along the lower margin of the middle portion of the club there is a band 

 of small suckers, like those on the other margin; along the basal third 

 of the margin and supported on a thickened marginal expansion of the 

 club, there is a row of six special, smooth, connective suckers, at the 

 inner ends of transverse, muscular ridges (fig. le); between and alter- 

 nating with these suckers, there are deep pits and as many small, round 

 tubercles, destined to fit the suckers and ridges of the other club; con- 

 tinuous with these a row of similar, but smaller, sessile, connective 

 suckers and tubercles extends down along the margin of the inner face 

 of the arm, for about half its length, becoming smaller and more simple 

 proximally; an irregular band, formed of two or three rows of small, 

 pediceled and denticulated suckers, extends down the other margin of 

 the arm, with some scattered ones along the middle. 



The pen (Plate XLV, fig. Id) is thin, long and narrow ; anterior part 

 about half as wide as the middle portion, slender, concave, with thick- 

 ened margins; the anterior end is very thin, acute; the two marginal 

 ribs converge gradually, as they run backward, and unite near the pos- 

 terior end; the widest part of the pen is a little behind the middle; the 

 thin margins begin at about the anterior third, gradually increasing in 



*The figure given (Plate XV, fig. 3) of the somewhat injured tentacular club of 

 the type of Cheloicutliis rajpax represents the structure nearly correctly, but many of the 

 6mall suckers and tubercles on the arm, below the club, had been destroyed, the edge 

 above e' is injured, and of the large hooks (a, a') only the sheaths remain. 

 S. Miss. 59 27 



