344 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [134] 



then rather suddenly narrows to a point, over the end of the pen 5 the 

 point, when in its normal position, 'reaches as far forward as the poste- 

 rior border of the eye, or even beyond it. Dorsal connective cartilage 

 long, tapering backwards, with a very prominent, broad dorsal keel 5 

 the anterior end is free and shaped like the end of the pen. Siphon 

 large, rounded anteriorly, with a broad, bilabiate opening ; lateral carti- 

 lages (Plate XXIX, fig. 1,/) long and narrow, subacute anteriorly, pos- 

 terior end with a thin, rounded outer lobe ; median groove narrow. The 

 connective cartilages of the mantle (fig. 1, /') are simple longitudinal 

 ridges, fading out gradually posteriorly. Head moderately large, usually 

 narrower than the mantle, smaller in the male than in the female 5 eyes 

 large; nuchal crests (fig. 1, b) above the ear, formed by longer upper, 

 and shorter inferior, oblique, longitudinal membranes, the two united 

 by a doubly curved or V-shaped membrane, having its angle directed 

 forward, the whole having a rude W -shaped form. 



Arms large, stout, the three upper pairs successively longer; the ven- 

 tral ones a little shorter than the third pair, and a little longer than the 

 second pair. All the arms have narrow, thin marginal membranes, 

 strengthened by strong transverse muscular ridges. The first and 

 second pairs of arms are trapezoidal at base ; third pair stouter, com- 

 pressed, with a keel on the middle of the outer side. Suckers in two 

 regular rows on all the arms, deep, very oblique, largest on the lateral 

 arms; those on the ventral arms are smaller, but otherwise similar. 

 Horny rings yellowish or brownish (white when fresh), strong; on the 

 larger proximal suckers the outer or higher side is divided into about 

 six broad, flattened, incurved teeth, which are blunt, subtruncate, and 

 sometimes even emarginate at tip, remainder of margin nearly even ; 

 the smaller suckers, toward the tips of the arms, have the teeth longer, 

 much more slender, and more acute. 



The tentacular arms (Plate XXVI, fig. 2) with fresh speciincux, in full 

 extension, may reach back nearly to the cud of the body ; with preserved 

 specimens they seldom extend beyond the middle of the caudal fin; 

 they are rather slender, compressed, with a narrow, thin membranous keel 

 along the outer edge, becoming wider at the club ; on the distal half 

 of the club it is much wider and runs a little obliquely along the back 

 part of the upper side, where it is usually folded down against the side, 

 its inner surface being whitish. The club is rather broad and thick, 

 with a wide, scalloped marginal membrane along each edge; these mem- 

 branes are strengthened by transverse muscular ridges, which commence 

 between the large central suckers and fork at the pedicels of the rnarg* 

 nal ones. Along the center of the club there are two alternating rows 

 of large, broad, depressed suckers, about seven in each, with a few 

 smaller ones, of the same series, at both ends; along each edge, alter- 

 nating with the large suckers, there is a row of smaller and more oblique 

 marginal suckers, about half as large. The proximal part of the club 

 bears only a few small denticulated suckers; the distal part bears a 



