CEPHALOPODA OF THE HAWAIIAN ISLANDS. 



329 



A. astrosticta is a remarkably distinct species and is not closely approached by any other known form 

 excepting possibly the very recently described A. sieindachneri Weindl 1912 of the Red Sea, which 

 is thought by its author to be somewhat nearly related. A complete account of the latter species has 

 not yet reached me, but from the preliminary notice above cited it would seem that this is the case, 

 although the two forms differ in enough particulars to be sufficiently distinct. In Weindl 's species 

 the fins are not quite so short and wide, there are seven to eight hooks on the tentacle club, and the 

 median photophore on the eyeball is said to be much the smallest. 



It has seemed worth while to make the account of this species as full as possible, firstly on account 

 of the special interest attaching to forms of this group, and secondly because of the unusually fine 

 condition of the present specimen which renders the chance for misinterpretation correspondingly 

 slight. 



Abralia trigonura Berry 1913. 



Abralia species Berry 1909. p. 419 (locality record only). 

 Abralia trigonura Berry 1913, p. 565. 



There is a second specimen of Abralia in the Albatross collection, which, although not very well 

 preserved, is clearly not referable to A. astrosticta, but belongs rather to the typical section of the genus. 



Animal of small size, in general loliginiform, but the mantle rather short, wide, inflated, and 

 rapidly tapering to a point posteriorly. Fins large, a little over 

 half as long as the mantle; their total width about approximates 

 the length of the mantle. 



Head rather small, squarish; olfactory crests low (crushed, and 

 not distinct). Eyes large and prominent. Funnel large, trian- 

 gular, compressed. Funnel organ well developed; similar in general 

 arrangement to that of A. astrosticta, except that the lobes of the 

 median (dorsal) pad are broader, and the ventro-lateral cushions 

 are ovate and conspicuously larger (fig. 33). The funnel has a 

 delicate foldlike valve at the tip. 



Arms quite long, over two-thirds the length of the body; sub- 

 equal, but the dorsal pair distinctly the shortest; order of length 

 in general 2, 4, 3, 1. The arms bear two rows of small alternating 

 hooks, which are replaced by suckers at the extremities. 



Tentacles very long and slender, the clubs little expanded 

 effaced, but a single hook persisting on one of the clubs is much longer, more slender, and much more 

 curved than those of A . astrosticta. 



Buccal membrane large; eight-pointed; papillose and uniformly pale within; its outer surface 

 conspicuously dotted with many small, distinct, dark reddish chromatophores. 



The gladius as compared with that of A. astrosticta is similar in general shape, but is relatively 

 much flatter and less slender, with, however, a wider and more robust midrib; the lateral expansions 

 are conspicuously broader and their angles more pronounced and more anterior in position. 



The photophores of the ventral integument are of a very different aspect than those of A . astrosticta, 

 but here also they are apparently of two main types. The larger appear as small whitish tubercles, 

 which, under the microscope, show a lenslike core of chalky white color inclosed by a pale bluish 

 gray ring. The smaller organs are either (1) conspicuously darker, comprising a light bluish core 

 surrounded by a narrow dark ring distinctly composed of separate bodies of pigment, or (2) but slightly 

 darker and resembling the large organs in miniature. The integument of the mantle has mainly 

 sloughed away, but from the portions remaining there appear to have been two very definite parallel 

 rows of the larger organs running down the medio-ventral line, with at least two other series on either 

 side more or less parallel to them. The smaller organs are exceedingly numerous and heavily distributed 

 among the larger all over the ventral surface. 



Fig. 33. — Abralia trigonura, outline draw- 

 ing of funnel organ [275I, X 3. 



The armature is almost entirely 



