. Cephalopoda. Cephalopoda. 141 of the muscular mantle and the posterior part of the abdominal complex, which advance posteriorly as the cone becomes smaller. The mantle sac thus assumes the general form characteristic for the Loliginidae and Oegopsida, and which we assume for Prototeuthis (Figure 53). The posterior pallial arteries and veins, the musculus rectus abdominis and the fin nerves, which pass along the margin of the proostracum, become thus markedly lengthened. (140). FIGURE 57. Situs of mantle cavity of Prototeuthis after removal of the ventral part of the muscular mantle and sligh
. Cephalopoda. Cephalopoda. 141 of the muscular mantle and the posterior part of the abdominal complex, which advance posteriorly as the cone becomes smaller. The mantle sac thus assumes the general form characteristic for the Loliginidae and Oegopsida, and which we assume for Prototeuthis (Figure 53). The posterior pallial arteries and veins, the musculus rectus abdominis and the fin nerves, which pass along the margin of the proostracum, become thus markedly lengthened. (140). FIGURE 57. Situs of mantle cavity of Prototeuthis after removal of the ventral part of the muscular mantle and slight extension in the normal body position. The funnel apparatus is still asinProtodecapus as are the funnel retractors (Tr), gills (as far as visible),anus (AO. intestine (Ed), ink sac (Tb), renal (Np) and genital papillae (Gd),the translucent venous appendages (Va) and branchial hearts (Kh),the musculus rectus abdominis (Mr), the lateral pallial veins (VI), the margin of the posterior part of the proostracum' (Gl) and the adjacent nerves of the fins (Fn). Reduction of the phragmocone results in an advance of the muscular mantle (Mm) and viscera towards the posterior end with a corresponding lengthening of the posterior pallial arteries and veins ( Vp), of the nerves of the fins (Fn), and the entire pos- terior abdominal complex. Also important are the characteristic form and position of the fins (Fl) and the funnel gland (Td), parts of which extend back toward the infundibular retractors. Go — olfactory organ; R — funnel; Tt — funnel pocket; Th — funnel bond; Vc — vena cava; Kb — branchial attachment; Vb — branchial vein; Ab — branchial artery; Pd - pericardial gland; Ct — coelom pocket for the branchial heart; Am — median pallial artery; Ms — mantle septum; Co — cone; Sp — rostrum. The animal is assumed to be a male, but the opening of the genital pocket from which the genital process projects (Gd) is not shown (cf. Figure 35). Removal of the viscera a
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectcephalopoda
