EXPLANATION OF THE PLATES. 



AH the figures were drawn from nature by Mr. J. H. Emerton, except when other- 

 wise stated.* 



Plate XXYI. 

 Figure 1. — Architeuthis Harreiji Y. (N'o. 24). Young. Phar^^nx and beak, with 



odoutophore ; o, oesophagus, natural size. 

 Figure 2. — The same. Distal part of tentacular arm, with club, natural size. 

 Figure 3. — The same. Segment from distal portion of left arm of the third pair of ses- 

 sile arms, front view; 3a, the same, side view, natural size. 

 Figure 4. — The same. Basal portion of right arm, of second pair. Front view, 



natural size. 

 Figure 5. — Architeuthis Harvey i V. (No. 2). One of the marginal suckers of the 

 club, side view ; 5a, tlie same, front view, enlarged 2 diameters. 



Plate XXVII. 

 Figure 1. — Desmoteuthis hyjierhorea V. Ventral view of a female, \ natural size. 

 Figure 2. — The same specimen. Dorsal view of head and arms. Part of the arms 



are imperfect. 

 Figure 3. — Histioteuthis ColUnsii V. Original t^'pe. One of the tentacular arms. 



Front view, -J natural size. 

 Figure 4. — Beak of the same specimen ; a, upper, h, lower mandible, natural size. 

 Figure 5— Suckers of the same specimen: a, side, and a', front view of one of the 



larger suckers of lateral arm; 6, side, and b' front view of a distal sucker, 



enlarged 2^ diameters. 

 Figure 6. — Sthenoteuthis megapiera V. Side view of jaws and odoutophore, natural 



size. 

 Figure 7 and 7a. — Sthenoteuthis pteropibs V. Upper and lower mandibles, natural 



size. 

 Figure 8. — Rossia Hyatti V. Side view of young male, natural size. 

 Figure 9. — The same. Egg containing an embryo ; enlarged 6 diameters. The 



shaded portion represents the yolk still remaining unabsorbed. 

 Figure 10. — Onychoteuthis Banlcsii. One of the large hooks from the middle of the 



club; a, side view; a', front view ; enlarged 4 diameters. 

 Figure 11. — The same. Corresponding views of one of the smaller hooks of the club. 

 Figure 12.— The same. Horny ring from one of the small suckers on the proximal 



cluster of connective suckers and tubercles of the club ; a, side view ; a', front 



view, enlarged 4 diameters. 



* Most of these figures were drawn in India ink, by Mr. Pimerton, for the U. S. 

 Fish Commission, to be engraved in relief, to illustrate a report on the Cephalopods by 

 the writer, which has been printing nearly simultaneously with this article in one of 

 the volumes of the report of Professor S. F. Baird, the Commissioner. To Professor 

 Baird I am greatly indebted for the privilege of first using a large part of the draw- 

 ings here, which has enabled me to illustrate this article more fully than would, 

 otherwise, have been possible. 



