132 



MR. W. E. HOYLE ON THE 



[Mar. 5, 



Gonaius. 



1. Arms (except the ventral pair) 



with hooks and suckers (4 

 rows). 



2. Tentacular club with hooks and 



suckers. 



3. Tentacle with connective appa 



ratus along the stem. 



4. The fins extend beyond the end 

 of the body and their carti 

 lage 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 



median! fused in middle of 

 their course. 



10. Eetractores mediani distinct 

 from retractores laterales. 



11. Nuchal muscle absent. 



12. Eadula with 5 rows of teeth ; 



median like those of Onyclio- 

 teiUhis. 



13. Anterior salivary glands rudi- 



mentary. 



14. Anal appendages symmetrical 



(in young). 



15. No 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 ex 

 tends as far as they do. 



Enoploteutkis. 



Both present. 



simple. 



absent. 



With phragmocone and 

 dorsal process. 



As in Gonatus. 



Eetractores mediani fused 

 with retractores laterales. 



absent. 



7 rows, more complex. 



small. 



asymmetrical. 



Accessory hearts. 



two. 



Oviducts opening into pouch 

 dorsal to gill. 



present. 



Arms with hooks, or hooks 

 and suckers (2 rows). 



Tentacular club with hooks 

 and suckers. 



As in Onychotcuthis. 



The fins do not extend be- 

 yond the end of the 

 body. 



Both present. 



simple. 



absent. 



Neither phragmocone nor 

 dorsal process. 



Musculi retractores capitis 

 mediani distinct. 



Eetractores mediani distinct 

 from retractores late- 

 rales. 



present. 



7 rows, less complex. 



rudimentary. 



symmetrical. 



Accessory hearts. 



two. 



As in Gonatzts, 



absent. 



