38 Transactions. — Zoology. 



neighbour. The teeth of the sub-lateral line are acute, stout, 



and much curved towards the sub-median. The laterals are 

 slighter than the last, acute, and also curved inwards. 



Measurements. 



Inches. 



Total length (including tentacular arms) . . . . 684 



Body, from tip of tail to anterior margin of mantle 71 



„ circumference, one foot from anterior margin 54 



,, ,, at centre . . . . . . 63 



,, „ immediately in front of fin . . 45 

 Head, from anterior margin of mantle to root of 



tinns » . , . . . . . . . a . — 



,, circumference . . . . . . . . . . 32 



Eye socket, long . . . . . . . . . . 5£ 



i) >. deep 3£ 



Fins, longitudinal . . . . . . . . . . 24 



,, transverse . . . . . . . . . . 28 



"Tail" 4 



Tentacular arm, length . . . . . . . . 691 



„ ,, circumference . . . . . . 3| 



Sessile arms, first . . . . . . . . . . 59 



,, second .. .. .. .. .. 62 



„ third . . . . . . . . . . 68 



,, „ circumference .. .. .. 12 



,, fourth . . . . . . . . . . 95 



Length of upper mandible, tip to end of palatine 



lamina . . . . . . . . . . . . 4^ 



Length, tip to end of frontal lamina . . . . 2J^ 



Cutting edge of rostrum . . . . . . . . $$ 



,, ,, aia . . . • . . • • • • 5^- 



Tip to lateral border of frontal lamina . . . . lfo 



Lower mandible, tip to border of mentum . . . . 1J§ 



„ tip to lateral border of ala . . 1J$ 



,, height of tooth . . . . . . ^j 



EXPLANATION OF PLATES VII.— IX. 



Plate VII. 

 Architeutltis longimanus. Sketch showing side-view, 2 \th natural 



size. 



Plate VIII. 

 Posterior portion of body, showing shape of fins. 

 Sucker from third (sub-ventral) sessile arm. Natural size. 

 Section of same. Natural size. 



Bony ring extracted from same; front view. Natural size. 

 The same ; Bide view, showing obliquity. Natural size. 

 The same ; lower margin, showing scarp to allow the passage of 



the stalk of sucker. Natural size. 



