196 



THE YOYAGE OF H.M.S. CHALLENGER. 



it, probably owing to the heat of the tropics, through which it must have passed three 

 times. The hidden portion included the oral region and the tentacles, and when the 

 superfluous material was scraped away these were seen to present the appearance shown 

 inPLXXXII.fig.il. 



Since then two out of three specimens exhibit the suckers (for they can be made out 



Fio. 10. — " A somewhat older specimen of Procalistes Suhmii. Drawn by E. Ray Lankester from a specimen 

 mounted on a glass slide in balsam by R. von Suhm. Magnified 20 diameters. 



"a. The long 'arms' or processes of the fore-foot; ft, the smooth buccal margin devoid of processes; c, the elongated neck; 

 d, the pedunculated eyes ; e, the edge of the mantle flap, separated from its attachment to the head and funnel by 

 pressure ; /, the fimnel or siphon ; g, the anal process seen through the transparent mantle, and showing a spiral band 

 of black pigment lying in the inlc-bag ; h, chromatophores ; i, the pen ; k, the median posterior process of the body ; 

 I, the lateral fins attached to the same ; m, the two horny beaks of the buccal apparatus." (Lankester, loc. cit.) 



in the "damaged" one), and since the "complete" example is almost as large as the 

 "stained" one, it seems to me more natural to adopt the alternative hypothesis rejected 

 by Professor Lankester, and to believe that the suckers are not present in the one 

 specimen because they have been accidentally removed. This view is strengthened by 



