1900.] A EAUE CUTTLEFISH. 993 



in front, somewhat narrower posteriorly, and with a well-marked 

 median groove, which becomes obsolete in the hinder half of its 

 length. The free lateral borders are half an inch broad in front, 

 and not more than half as much posteriorly. The corresponding 

 surface on the mantle accords with the position of the upper 

 end of the pen ; it is a colourless area, about 2 inches broad, 

 and reaches down to the junction of the neck with the mantle- 

 wall. Its edges are somewhat tumid and show remains of a darker 

 pigmentation. 



The funnel-organ consists, as in EnoploteutMs, of a central pad 

 in the form of a A, with the apex forwards, and the limbs, each 

 about 8 inches long and 1 inch broad in the middle, reaching to 

 the base of the funnel ; and of two lanceolate lateral pads, rounded 

 at the anterior and more pointed at the posterior extremity, each 

 4 inches long and 1| inches broad at their broadest part. The 

 area of each of these pads is colourless, but each is bounded by a 

 narrow and deeply pigmented ridge, which projects outwards as a 

 slight fold. 



The orifice of the eye is approximately square, about an inch in 

 diameter, but prolonged anteriorly into a notch or sinus bounded 

 on the ventral side by a smaller, on the dorsal side by a larger, 

 rounded or thickened flap. The sinus is about half an inch long, 

 and approaches to within an inch and a quarter of the edge of the 

 web which unites the ventral and ventro-lateral arms. 



About 2| inches below the eye, a slight thickened ridge runs, 

 as described by Verrill, around the neck, forming the upper border 

 of the nuchal collar, and from this ridge proceed downwards 

 (or backwards) certain folds or fringes. On a line with the dorsal 

 border of the eye, the first of these fringes, about | inch iu breadth, 

 runs downwards for 1| inches and then turns outwards for about 

 the same distance. Nearly opposite the ventral margin of the eye, 

 but somewhat to the ventral side of it, the second fold (not quite 

 so elevated) runs downwards and then outwards, marking off a 

 quadrilateral area about 1^ inches square. The third and last 

 fold, midway between the foregoing and the attachment of the 

 funnel, is a simple vertical fold running downwards for 1| inches 

 from the aforementioned ridge, but also continued upwards to 

 the base of the ventral arm. This fold is about 1 inch in height 

 posteriorly, gradually diminishing in height but becoming much 

 thicker anteriorly. 



The upper mandible (fig. 1, p. 994) is very sharply hooked ; 

 the lower has no tooth on its cutting-edge. The radula has the 

 usual seven rows of teeth. 



The buccal membrane or " circumoral web " is well developed, 

 expanding to a radius of about 4 inches. . Its relations to the arms 

 are as in Ommastrephes. That is to say, here (as in Ommastrephes) a 

 fringe or web, narrow and delicate, runs up either side of each arm 

 parallel and close to the attachments of the suckers. Four of these 

 fringes on each side of the animal are confined to the arms ; the 

 other four, viz., the dorsal ones in the dorsal and dorso-lateral 



