. The Cephalopoda. Cephalopoda. add. ant. add. post. figure 24. Chiroteuthis imperator. Funnel adductors: anterior adductor: , posterior adductor; ; coll. figure 25. Funnel cartilage of Chiro- teuthis picteli Joub. heart-shaped with the apex anteriorly. The paired central parts (org. ) are oval. The head is unusually long; it is 63 mm long from the dorsal mantle corner to the base of the arms, 69 mm from the ventral mantle margin. It is cylindrical, without protruding eyes, at least in large speci- mens. This is in contrast to the head of
. The Cephalopoda. Cephalopoda. add. ant. add. post. figure 24. Chiroteuthis imperator. Funnel adductors: anterior adductor: , posterior adductor; ; coll. figure 25. Funnel cartilage of Chiro- teuthis picteli Joub. heart-shaped with the apex anteriorly. The paired central parts (org. ) are oval. The head is unusually long; it is 63 mm long from the dorsal mantle corner to the base of the arms, 69 mm from the ventral mantle margin. It is cylindrical, without protruding eyes, at least in large speci- mens. This is in contrast to the head of , in which the large eyes cause the rounded form of the head (Plate XL, Figure 1). The neck, which extends from the anterior margin of the collaris and funnel to the lower margin of the eye, bears no folds. Except for the funnel adductors, there are no distinct muscles in this region. The arm musculature extends into a continuous cephalic and cervical muscular tube which is covered by the cutis with a honeycomblike pattern. It contains longitudinal muscles from the base of the arms to the upper and lower margin of the orbit. The eyes (Plate XLIII, Figures 2, 4) are situated in the middle of the head and do not protrude, giving the head part a cylindrical shape. Their contour is almost circular and they are flattened in the main axis. The eyes of our specimen are 23 mm in transverse diameter and their main axis measures about 15 mm. Only a narrow median bridge separates the eyes, since the head is about 32 mm wide. The eyes are thus quite large. However, they are relatively smaller than the impressive eyes of Ch. veranyi, which are almost as large as the visceral sac. The eyeball is blackish grey; the iris is 6 mm wide and has a metal- lic sheen. The slightly convex lens covers the pupil, which is 9 mm wide. The blunt-triangular optic ganglion is situated on the posterior inner side of the eyeball, slightly 244 closer to the dorsal side (Plate XLIII, Figure 4, ).
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectcephalopoda
