257 
Figure 2.—The same. Dorsal view. The dotted lines indicate portions of the arms 
that had been destroyed. 
Figure 3.—The same. Side-view of the head and siphon, with the anterior part of 
the mantle, cut open; e, the eye; s, siphon; 0, 0’, 0", the three nuchal frills; 
c, c’,c", the smooth facets. where the mantle bears upon the neck; c, ventral 
facet of mantle; c’, ventral facets at base of siphon; c", dorsal facet of neck ; 
m, m’, cut edge of mantle. 
Figure 4.—The same. The entire dorsal ‘pen’; side-view, #y natural size. 
Figure 5.—The same. Ventral view. 
Figure 6.—The same. A portion from tbe middle of the ‘ pen,’ less reduced. 
Allthe figures were made from the fresh specimens by Mr. W. H. Dall. 
PLATE XXIV. 
Figure 1.— Onychoteuthis robusta (Dall). Odontophore; side-view, enlarged 32 diame- 
ters. 
Figure 2.—The same. Part of a row of the teeth from near the anterior bend of the 
odontophore, x 22 diameters; a, median tooth, front view ; a’, side-view of same; 
b, first lateral; 6’, the same, side-view; c, second lateral, front view; d, outer 
lateral, front view. 
Figure 3.—The same. One of the inner lateral teeth, side-view. x 54 diameters. 
Figure 4.—The same. Median tooth, side-view, x 54 diameters. 
Figure 5.—The same. Upper mandible, natural size. 
Figure 6.—The same. Lower mandible, natural size. 
Figure 7.—The same. Anterior end of cone of pen, showing portion of posterior end 
of quill inserted into it, 4 natural size. 
Figure 8.—The same. Section of a ventral arm, close to the base, natural size; a, 
one of the suckers, side view; 6, and b, marginal membranes; c¢, crest on mem- 
brane along outer angle; e, median vessel near inner surface. 
Figures 1 to 4 are camera-drawings by the author; the rest are by J. H. Emerton. 
PLATE XXV. 
Figure 1.—Architeuthis Hartingii V. Lower mandible, showing anterior portion 
only, natural size ; 1a, section of a sucker of sessile arm of same; 10, horny ring 
of same, natural size. After Harting. 
Figure 2.—Architeuthis dua Steenstrup. Lower mandible, uatural size. Copied from 
Harting’s figure, after Steenstrup. 
Figure 3.—Architeuthis monachus Steenstrup (type specimen). Lower mandible, nat- 
ural size. After Steenstrup. 
Figure 4.—Enoploteuthis Hartingii Verrill. A section of one of the claw-bearing 
suckers, somewhat enlarged ; 4a, the horny claw, isolated ; 4b, median and lateral 
teeth of odontophore. After Harting. 
Figures 5 and 5a.—Architeuthis Harveyi V.(No. 4). The two halves of the lower 
mandible, natural size. Camera-drawings from the specimen, by the author. 
The author is greatly indebted to Professor S. F. Baird, U. 8. Commissioner of Fish 
and Fisheries, for the use of a large number of the excellent drawings made by Mr, 
J. H. Emerton, of Salem. Mass., under the direction of the author, for the Fish Com- 
mission, many of which are included in these plates. 
