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 ; o, o', o", 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 ; 
to, m', cut edge of mantle. 
Figure 4. — The same. The entire dorsal ‘pen’ ; side-view, ^ natural size. 
Figure 5. — The same. Ventral view. 
Figure 6. — The same. A portion from the middle of the ‘ pen,’ less reduced. 
All the figures were made from the fresh specimens by Air. W. H. Dali. 
Plate XXIV. 
Figure 1. — Onychoteuthis robusta (Dali). Odontophore ; side-view, enlarged 3 J 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; b\ 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. Aledian 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, -J- natural size. 
Figure 8. — The same. Section of a ventral arm, close to the base, natural size ; a, 
one of the suckers, side view ; b, 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. — Architeutbis Hartingii V. Lower mandible, showing anterior portion 
only, natural size ; la, section of a sucker of sessile arm of same ; 1&, horny ring 
of same, natural size. After Harting. 
Figure 2. — Architeutbis dux Steenstrup. Lower mandible, natural size. Copied from 
Harting’s figure, after Steenstrup. 
Figure 3. — Architeutbis monachus Steenstrup (type specimen). Lower mandible, nat- 
ural size. After Steenstrup. 
Figure 4. — Eaoploteuthis Hartingii Verrill. A section of one of the claw-bearing 
suckers, somewhat enlarged ; 4a, the horny claw, isolated ; 4 b, median and lateral 
teeth of odontophore. After Harting. 
Figures 5 and 5a . — Architeutbis Bdrveyi 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. S. Commissioner of Fish 
and Fisheries, for the use of a largo 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. 
