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Show 132 MR. W. E. HOYLE ON T H E [Mar. 5, Gonatus. 1. Arms (except, the ventral pair) with hooks and suckers (4 rows). 2. Tentacular club with hooks and suckers. 3. Tentacle with connective apparatus along the stem. 4. The fins extend beyond the end of the body and their cartilage slides upon the gladius. 5. Valve in funnel; also funnel-organ. 6. Siphono-pallial articulation simple. 7. Siphonal cartilage present. 8. Pen with phragmocone but no dorsal process. 9. Musculi retractores capitis mediani fused in middle of their course. 10. Retractores mediani distinct from retractores laterales. 11. Nuchal muscle absent. 12. Eadula with 5 rows of teeth; median like those of Onychoteuthis. 13. Anterior salivary glands rudimentary. 14. Anal appendages symmetrical (in young). 15. N o accessory hearts on the arteries. 16. Oviducts in number two. 17. Oviducts dorsal to gill-roots. | 18. Nidamental glands present. Onychoteuthis. Arms with suckers (2 rows). Tentacular club with hooks and suckers. Tentacle with connective apparatus confined to base of club. The fins extend beyond the end of the body proper, but the pointed dorsal process of the gladius extends as far as they do. Both present. simple. absent. With phragmocone and dorsal process. As in Gonatus. Retractores mediani fused with retractores laterales. absent. 7 rows, more complex. small. asymmetrical. Accessory hearts. two. Oviducts opening into pouch dorsal to gill. present. Enoploteuthis. Arms with hooks, or hooks and suckers (2 rows). Tentacular club with hooks and suckers. As in Onychoteuthis. The fins do not extend beyond the end of the body. Both present. simple. absent. Neither phragmocone nor dorsal process. Musculi retractores capitis mediani distinct. Retractores mediani distinct from retractores laterales. present. 7 rows, less complex. rudimentary. symmetrical. Accessory hearts. two. As in Gonatus. absent. |