CEPHALOPODA OF THE HAWAIIAN ISLANDS. 
343 
Individuals of the corresponding stage in the degree of separation of the tentacles approximate 
very closely to the brief account and figure of R. chuni as given by Hoyle, and may very well be con- 
generic with it, although only the identification of the adults will show whether tliey are referable to 
the same species. The fact that the suckers extend more than half way along the tentacles of the largest 
specimen affords a certain suggestion that the present series are larval Ommastrephes hawaiiensis . 
Rhyncoteuthion p. 
Animal small, pelagic; mantle elongate, less than half as wide as long; nearly cylindrical, slightly 
tapering, bluntly pointed posteriorly. Fins almost continuous above, minute, rounded, subterminal. 
Anterior margin of mantle with a faint medio-dorsal angle; very weakly emarginate below the funnel. 
Locking appartus typically Ommastrephid. 
Head small, flattened; a little wider than the body. Eyes large, rounded; apertures angled in 
front. Funnel short, broad, not reaching to the eye openings. 
Arms very short, imequal, the ventral pair decidedly the shortest; suckers moderately large, bi- 
serial, obliquely placed on short pedicels; homy rings minutely toothed. 
Tentacles shorter than the arms, and remarkable in that their inner faces are fused with one another 
for only a short space below the free recurved tips. When examined with a high-power lens each ten- 
tacle is seen to be furnished with a number of small suckers just distal to the point of fusion, one of 
which is greatly larger than the others, hood shaped, distinctly pediceled, its homy ring minutely 
toothed, median in position, and placed in close opposition to its mate of the other tentacle. 
Color in alcohol a pale brownish buff, the chromatophores considerably darker. There is a pair of 
large rather conspicuous chromatophores transversely placed on the dorsal aspect of the head. 
Measurements of Rhyncoteuthion /?. 
Total length 
Length of mantle, dorsal. 
Width of mantle 
Width of head 
Length of head 
mm. 
12.5 
8 
3 
3-5 
2 
width across fins 
Length of fins 
Length of second arms 
Length of tentacles ... 
mm. 
3 
1- S 
2 - 5 
1-5 
Material examined . — The single specimen was taken from the surface Albatross station 3930, lati- 
tude 25° O’]' N., longitude 170° 50' W., between Honolulu and Laysan Island (S. S. B. 246). 
Remarks . — The unique specimen forming the subject of the foregoing account is a minute squid 
at once distinguishable from the preceding by its elongate more pointed body and entirely different 
arrangement of the chromatophores. The curious pair of large opposite suckers on the tentacles may 
merely represent the first of these stmctures to become fully differentiated, but their entire aspect is 
rather that of some temporary larval adaptation . 
Family CHIROTEUTHID^ Gray 1849. 
Chiroieuikidoi Gray 1849, p. 36, 42. 
ChiroieuthidiS Verrill 1881, p. 430. 
Chiroteuthidce Pfeffer 1900, p. 153, 183. 
ChiroteuthidcB Chun 1910, p. 216. 
Chiroteuthidce Pfeffer 1912, 539. 
Body soft and semigelatinous or somewhat membranous. Mantle elongate, terminating in an acute 
and often slender point. Fins large. Head elongate; “olfactory tubercle” stalked. Arms with two 
rows of suckers, the ventral pair usually conspicuously the longest and largest. Tentacles very long, 
the stalk without suckers; club with four or more rows of suckers; none of the suckers on either arms or 
tentacles modified into hooks. Funicular locking cartilages broad, deeply grooved, usually more or 
less ear-shaped. Gladius slender, with weak narrow wings and a long cone. Photogenic organs may 
occur over the outer surface of the body, on the eyeball, or within the pallial chamber; frequently 
absent. 
