255 
Plate XVIa. 
Figure 1. — Architenthis Harvey i Y. (No. 5). Teeth of the odontophore, from the 
anterior portion, enlarged 18 diameters; a, median: b, inner lateral; c, and d, 
the two outer lateral teeth ; e, marginal plates. 
Figure 2. — The same. Teeth from the same specimen, from farther back, on the 
dorsal portion of the odontophore. Lettering as in figure 1. 
Figure 3. — The same. Anterior portion of odontophore, showing the teeth nearly in 
their natural positions, enlarged. 
Figure 4. — The same. Portion of the membrane lining the palate, showing teeth and 
hard granules, enlarged. 
Figure 5. — The same. Two of the granules from the membrane lining the mouth, 
enlarged 18 diameters. 
Figures 6 and 6 a . — The same. One of the largest and least oblique of the horny 
rings from the suckers of the sessile arms; top and side-views, enlarged 1£ 
diameters. 
Figures 7 and 7 a . — The same. One of the medium sized, and more oblique suckers 
of the sessile arms ; top and side-views, enlarged 14 diameters. 
Figure 8. — The same. Another similar sucker, but smaller and more oblique ; top- 
view, enlarged 1-J- diameters. 
Figures 9 and 9a. — The same. One of the horny rings from one of the smooth-rimmed 
suckers on the 'wrist’ of the ‘club ’ of the tentacular-arms; top and side-views, 
enlarged 3 diameters. 
Figures 10 and 10a. — The same. One of the small suckers from the terminal portion 
of the ‘club,’ top and side-views, enlarged 3 diameters. 
Figures 1 to 5, and 8, are camera-drawings by the author. The others are by J. H. 
Emerton. 
Plate XYII. 
Figures 1 and l a . — Architenthis princeps Yerrill (No. 14). A marginal ring from one 
of the large suckers of the tentacular-arm ; 1 , side-view, enlarged 14 diameters ; 
1®, portion of the rim, enlarged 3 diameters. 
Figures 2 and 2\ — The same. One of the medium-sized oblique sucker-rims from a 
sessile arm, enlarged 14 diameters ; top and side-views. 
Figures 3 and 4. — The same. Top and side-views of one of the smaller sucker-rims 
from a sessile arm, enlarged 3 diameters. 
Figures 5 and 6. — The same. Top and side-views of a complete sucker, with its 
pedicel, from a sessile arm, enlarged 1£ diameters. 
Figure 7. — The same. Top-view of one of the smaller, very oblique sucker-rims 
from a sessile arm, enlarged 3 diameters. 
Figure 8. — The same. Portion of the horny rim of a medium-sized sucker from a 
sessile arm ; top-view, enlarged 6 diameters, from a camera-drawing. 
Figure 9. — The same. Side-view of the horny ring of one of the largest and least 
oblique of the suckers of the sessile arms, enlarged diameters. 
Figure 10. — The same. Side-view of the horny ring of one of the marginal suckers 
of the tentacular-club, enlarged 3 diameters. 
Figure 11. — A. princeps (No. 13). Portions of the horny ring of one of the large 
suckers of the tentacular-arm, much enlarged; a and b, portions of the margin, 
from the outside ; c, portion seen from the inside. 
Figures 8 and 11 are camera-drawings by the author; all the others are by J. H. 
Emerton. 
