[109] CEPHALOPODS OF NORTHEASTERN COAST OF AMERICA. 319 



on each side of it is shorter as compared with the next; six, on the inner 

 margin, are minute, and these are connected with the larger series by 

 one or two somewhat larger ones at each end of the inner border. 



The stumps of the tentacular arms are flattened, oval, and smooth, 

 measuring about 10 mm by 18 mm near the base ; their length is about 28 cm 

 (11 inches), which is doubtless less than half their original length. 



According to Steenstrup (op. ult. cit., p. 81, fig. 2), there are, in his 

 example, a few connective suckers and tubercles on the proximal part of 

 the club. 



The siphon is very large a id lodged in a broad groove in the lower side 

 of the head ; the anterior part of this groove, which is separated from 

 the rest by a transverse fold of the skin, is covered by about twelve nar- 

 row, longitudinal ridges, separated by strong longitudinal furrows ; an 

 additional outer ridge, on each side, is separated from the others by a 

 wider interval; several of these ridges and furrows extend backward 

 beyond the transverse fold. The dorsal side of the siphon is strength- 

 ened by a thick, longitudinal, muscular band, which becomes free from 

 the siphon farther back, and is united to the head by a small median 

 connective strap ; either side of this are the two broad connective bridles, 

 and at the sides of the siphon, near the ears, on each side, is a broad 

 lateral connection between the mantle and head, with a large aquiferous 

 opening beneath it. 



The exposed parts of the jaws (Plate XVII, figs. 3, a, b) are black and 

 polished; the lamince are reddish brown, with broad, thin, yellowish- 

 white margins. The upper mandible has a long, sharp rostrum, with reg- 

 ularly curved cutting edges, and a small, well-defined, V-shaped notch, 

 from which a short groove runs backward, beyond which there is a slight 

 ridge ; anterior edge of alas, beyond the notch, forming no distinct lobe 

 or tooth, but slightly convex and irregularly creuulate; posterior lateral 

 borders of alse with a broad sinus in the middle ; palatine lamina long 

 and thin, with sinuous posterior margins; frontal lamina broad, extend- 

 ing well backward. 



The total length of the upper mandible is 42 mm ; tip to posterior end 

 of frontal lamina, 33 mm ; to notch, lO 1 ^; greatest breadth (or hight), from 

 palatine to end of frontal, 30 mm ; transverse breadth, across frontal, 

 15 mm ; transverse breadth, across anterior edges of alae, 8 mm . 



The lower mandible has a strongly incurved beak, with the cutting 

 edges rather suddenly incurved at about the proximal third, and a well- 

 developed, broad, V-shaped notch at base, beyond which there is a 

 slightly prominent, broad tooth ; alse broad, the inner ends broader 

 than the middle, well rounded; mentum short, with a broad dorsal 

 emargination ; gular lamina short, the inner edges incurved. 



The total length of the lower mandible is 29 mna ; tip of beak to end of 

 mentum, 10 mm ; to ventral end of gular, 21 mm ; to bottom of notch, ll mm j 

 to inner ends of alse, 24 mm ; breadth, from inner ends of alee to mentum, 

 28mm. breadth of gular lamina, 17 mm ; breadth of alas, 12.5 mm ; greatest 



