154 THE VOYAGE OF H.M.S. CHALLENGER. 



I liave no hesitation in referring these sj)eciniens to de Blainville's species ; in general 

 appearance they agree rather vriih the figure of Loligo poeyana {op. cit., pL xix.) than 

 with the one on pL xiL, and in one specimen, at all events, there is a slight notching of 

 the fin at its anterior insertion. There is some discrepancy between d'Orbigny's 

 description and figure (pi. xx. figs. 3, 4) in respect of the horny ring of the large 



tentacular sucker, which is said to be " arme tout autour de dents d'egale 



grosseur," while the teeth are depicted as distinctly larger along one side of the ring than 

 the other ; the Challenger specimens agree with the figure. 



The teeth in the suckers of the sessUe arms present a slight variation, inasmuch as the 

 three median teeth are considerably narrower than the lateral ones. 



A specimen of Loligo hrasiliensis in the Copenhagen Museiim has the teeth of these 

 suckers alternately large and small, showing an interesting approach to Loligo pealei, 

 Les. to which this species is undoubtedly nearly related. 



The two larger specimens have a distinct spermatic pad within the ventral border 

 of the buccal membrane, very similar to that shown in PL XXV, fig. 4. 



Loligo hohiensis, Hoyle (PL XXV. figs. 1-10), 



1885. Loligo kobiensis, Hoyle, Diagnoses II., p. 184, 

 1885. „ „ Hoyle, Prelim. Eep. IL, p. 287, 



Habitat— ^teition 233, Bay of Kobe, Japan, May 17, 1875; lat. 34° 39' N., 

 long. 135° 14' E.; 8 fathoms; mud. One specimen, $ . 



Station 233c, Inland Sea, Japan, May 28, 1875; lat. 34° 18' N., long. 133° 21' E.; 

 12 fathoms ; blue mud. Four immature specimens.^ 



TJie Body is cylindrical in the anterior moiety, tapers posteriorly, and ends in a blunt 

 point The Jin is more than half the length of the body, trapezoidal, with rounded 

 lateral angles ; the extreme breadth is less than the length, and is situated anteriorly 

 to the middle of the fin. The mantle-margin presents a triangular process in the mid- 

 dorsal line and is deeply sinuate ventrally. The siphon is short and bluntly conical. 



The Head is short and not so broad as the body ; the eyes are comparatively small 

 and have a bow-shaped auricular crest behind and a minute pore in front of them. 



The Arms are unec[ual, the order of length being 3, 4, 2, 1, and, on the average, 

 rather more than one-third the length of the body ; the first are the most slender, and 

 have the dorso-median angle raised into a prominent keel ; the second have only a faintly- 

 marked angle ventro-laterally ; the third have a broad web externally, passing over at 

 the base into one which extends up the dorsal aspect of the ventral arms. The siichers 

 (figs. 2, 3) are arranged in two series, pedunculate, very oblique, and rather larger on the 

 lateral than on the other arms ; the horny ring has about nine short, close-set, square-cut 



' On the label attached to two of these specimens the locality was marked with a querj'. 



