322 



MR. CYRIL CROSSLAXD OX THE 



[Feb. 16, 



the antevioi- third of the body (PL XXI. fig. 9), commencing in 

 all these specimens on the third foot, except in the case of three 

 small specimens from tlie Maldives, in which the first bi'anchi- 

 ferous foot is the fonrth. In faii'-sized specimens the gills extend 

 fi'om the 34th up to the 50th foot,' and in one case sixteen 

 paii-s of i-udimentary gills followed this latter point. The maxi- 

 mum number of filaments is from ten -to twenty, this variation 

 being normal in lai-ge specimens, but one, also of fair size, had 

 gills abnoi-mally small and composed of only seven filaments. In 

 all the smaller specimens the gills are simpler, as mentioned above 

 and as in Gravier's specimen. The setse ai-e as described by 

 Gravier and othei- authoi-s, the acicula being simple at the point 



Text-fio-. 64. 



^^^a'^t 



Feet of JS. indica, showing maxiraimi development of gill. 



and slightly bent upwai-ds. The acicular hooks are exactly like- 

 those of E. antennata and E. imtrrayi, but often occur in greater- 

 numbers than ever in the former, the occurrence of four in one 

 foot being quite common. The compound seta? never have a 

 third hook in this species, but the pointed ending of the wing- 

 is very characteristic. Figs. 11 & 12, PI. XXL, illustrate these 

 features and show the difference in the form of the compound 

 setse from the postei-ior feet [cf. a and c). 



The most distinctive features of this species ai-e shared by 

 E. congesta Marenzeller, from the south of Japan. The differences 

 ai'e that the prostomium of the latter is "moderately deejil}- 

 indented," the jaw^-appai-atus shows slight diffjerences in having 

 fewer teeth, and the gills do not appear until the seventh or eighth 

 foot. Such differences are easily accounted for as individual 

 variations, and do not compare at all with the importance of their 

 points of resehrblance. The species ai-e alike in the coloui- and 

 form of the body (so far as these ai'e described by Marenzeller),. , 



