PEOF. OWEN ON NEW AND EAEE CEPHALOPODA. 169 



LoUgopsis ocellata, Ow. 



Fig. 3. Oral environment, natural size. 



Fig. 4. Transverse section of cephalic arm, magnified. 



Fig. 5. Sucker, showing denticulate hoop, magnified. 



Fig. 6. Upper mandible, natural size. 



Fig. 7. Lower mandible, natural size. 



Fig. 8. Gladius or " pen," less than natural size. 



PLATE XXVII. 



LoUgopsis ocellata, Ow. 



Fig. 1. Ventral view, natural size. 



Fig. 2. Dorsal view of head and part of mantle, natural size. 



PLATE XXVIII. 



Ommastrephes ensifer, Ow. 



Fig. 1. Dorsal view, half natural size. 



Fig. 2. One of the largest suckers and denticulate hoop, natural size. 



PLATE XXIX. 



Onychoteutliis raptor, Ow. 



Fig. 1. Dorsal view. 

 Fig. 2. Ventral view, dissected. 

 Fig. 3. Digestive organs. 

 Fig. 4. Circulating and respiratory organs. 

 (Natural size.) 



PLATE XXX. 



Enoploteuthis cookii, Ow. 



Fig. 1. Upper mandible. 



Fig. 2. Both mandibles or beak, with inner lip reflected. 



Fig. 3. Lower mandible. 



(Natural size.) 



