REPORT ON THE CEPHALOPODA. 



113 



The Colour is a pale yellowish-grey mottled witt dull purple, the spots being more 

 distinct on the ventral surface of the body, fins, and arms. There are four or five oval 

 patches on the outer side of the tentacle near the club. 



Tlie Gladius is absent. 



Dimensions. 



Length, total, 



End of body to mantle-margin. 



End of body to eye. 



Breadth of body, . 



Breadth of head, . 



Eye to edge of umbrella, 



Length of fin. 



Breadth of each fin, 



Breadth across the fins. 



Length of first arm. 

 Length of second arm, 

 Length of third arm. 

 Length of fourth arm. 

 Length of tentacle. 

 Length of tentacular club. 





120 mm. 





40 







45 







28 







25 







15 







22 







15 







57 





Eight. 



Left. 



38 mm. 



35 mm. 



50 „ 



50 „ 



50 „ 



50 „ 



38 „ 



40 „ 



65 „ 



70 „ 



U 



,, 



15 „ 



I have thought it well to give a full description and figures of this form because 

 its identity with that described by Dr. Pfefier is not quite certain. The diagnosis 

 of the latter agrees with the Challenger specimens in every particular, but no mention 

 is made of the remarkable structure of the tentacular suckers ; Dr. PfefFer, to whom 

 I wrote on this matter, does not seem, however, to have made a microscopic examina- 

 tion of them, without which their peculiarities would be quite unnoticed. Having 

 several specimens at my disposal, I removed a piece of the integument with the 

 suckers attached and mounted it in Canada balsam, and from this preparation the 

 figures 6, 7, and 8 on PI. XIV. were drawn. I am inclined on the whole to think that 

 the species are identical, and Dr. Pfeffer's name was therefore at first applied to the 

 Challenger ■specimens, and printed at the foot of the plate. 



In the absence of males there seems to be no point separating the present form 

 from VerrUl's Inioteuthis,^ also from Japan ; indeed, so far as females are concerned, this 

 genus would seem to differ only from Sepiola in the absence of the gladius, and should 

 perhaps contain several species which have been referred to the latter. Verrill does not 

 say how he identified his type with Sepiola japonica, Tilesius, which I have always 

 regarded as one of those Cephalopods concerning which no certain information was to be 

 had ; and his description omits the most characteristic point in that of d'Orbigny,^ 

 namely, the " tendon," which forms an elevated rounded tabular muscle lying between 



I Trans. Connect. Acad., vol. v. p. 417. ^ Moll, viv., p. 251. 



(ZOOL. CHAiL. EXP. — PART XLIV. 1886.) Xs 15 



