EXPLANATION OF THE PLATES. 
Plate XIII. 
Figure 1. — Architeuihis Harveyi (No. 5). Head and arms, -y natural size, from a photo- 
graph of the specimen when freshly caught. The back of the head rests upon an 
oar so as to cause the beak to protrude, while the arms hang down in a reversed 
position. The diameter of the bathing tub was 38 - 5 inches: a, left, and a' right 
ventral arms ; b, left, and b' right arms of the third pair ; c, left, and c', right 
arms of the second pair ; d', right dorsal arm, mostly concealed behind the others ; 
e, left and e', right tentacular-arms, folded several times over the oar ; i to iv, the 
1 club’ ; i to ii, the ‘ wrist’ ; ii to Hi, the part bearing large suckers ; Hi to iv, the 
terminal division ; o, the beak. 
Figure 2. — Part of the body and caudal fin of the same specimen, <y natural size, from 
a photograph made at the same time with the preceding ; u, mantle cut open ; 
t, tip of tail ; b, right and l, left lateral lobes of caudal fin. 
Plate XIY. 
Figure 1. — Architeuihis Harveyi. A restoration, yy natural size, based on the preced- 
ing figures and on the specimens received. (See note. p. 184). 
Plate XV. 
Figure 1. — Architeuihis Harveyi (No. 5). Upper mandible, natural size. 
Figure 2. — Lower mandible of same, natural size ; lacks a small piece at a. 
Figure 3. — Anterior part of the ‘ pen ’ of the same specimen, £ natural size. The 
dotted lines indicate missing parts. (Restored and drawn by the author). 
Figures 1 and 2 were drawn by Mr. J. H. Blake, from alcoholic specimens. 
Plate XVI. 
Figure 1. — A. Harveyi (No. 5). Portion of the lining membrane of the palate, 
enlarged. 
Figure 2. — A. Harveyi (No. 5). Caudal fin, A- natural size, drawn from the preserved 
specimen. 
Figure 3. — A. Harveyi (No. 5). Suckers of tentacular-arm, natural size ; a, one of the 
largest suckers ; b, one of the marginal suckers. 
Figure 4. — The same. Horny marginal ring of one of the suckers from a sessile arm, 
enlarged 2 diameters. 
Figure 5. — A. Harveyi (No. 4). One of the larger suckers from the tentacular-arms, 
natural size. From a dried specimen. 
Figure 6. — Portion of the marginal ring of the same sucker, enlarged. 
Figure 7. — Loligo pallida V. Part of odontophore, much enlarged. 
Figure 8. — Architeuthis Hartingii V. Part of odontophore, enlarged. Copied from 
Harting’s figures. 
Figures 5 and 6 were drawn by J. H. Emerton ; the rest by the author. 
