170 Mr. W. Small on Annelida PolijcJicBla 



The dorsal and ventral bristles have been fully described, 

 Fauvel (1911, p. 8) says there is little difference in length 

 between the dorsal and ventral bristles when allowance is 

 made for the place of origin of the dorsal bristles, but in the 

 present cases the ventral bristles project far enough beyond 

 the dorsal to emphasize their greater length. The relatively 

 shorter dorsal bristles of Eunoa nodosa serve to distinguish 

 that species from Eunoa cerstedti, Malmgren. 



Of the different anterior appendages oidy one of the palps 

 is present. It shows six rows of papillai^ conical in sha])e 

 and bent over at the tips, in preservation. According to 

 M'Intosh, these papillas become larger towards the extremity 

 of the palp. Any increase in size in the distal papilla3 as 

 com{)ared with the proximal is very small, and is negligible 

 in the present specimen. 



Eunoa tritoni, M'Intosh, 1898. 



The complete specimens of this species measure 20 and 

 30 mm. long respectively, but several fragments indicate 

 much larger forms. The largest fragment is 14 mm. broad 

 with the setas, and 25 mm. long. 



The head (PI. VI. fig. 1) is broader than long, and is 

 deeply incised anteriorly in the middle line. The lateral 

 eminences each end in two small peaks, and bear the large 

 eyes, which are four in number and situated laterally. The 

 median tentacle is absent; the lateral tentacles taper rapidly 

 to a point, and for the proximal two-thirds of their length 

 are covered with cilia closely resembling those of the tenta- 

 cular cirri. The palps are large and are provided with rows 

 of very small clavate or conical papillas; they are almost 

 twice as long as the lateral tentacles. The tentacular cirri 

 are thickly covered with long cilia which are knobbed at the 

 tips. Tliere is a slight expansion of the cirrus below its 

 filiform tip. 



The dorsal markings correspond to those of E. nodosa^ with 

 the exc( p;ion of the papillae, which are tbund in E. nodosa 

 internal to the scale-bearing tubercles. These are absent iu 

 Eunoa ir'itoni. 



The scales are reniform in outline and have a thick fringe 

 of cilia on the outer edge. Inside this fringe is a set of 

 elongated tubercles divided at the tips, and along the poste- 

 rior border and easily seen by the naked eye are several 

 capstan-shaped tubercles. The latter are alwaj's more than 

 six ill number, but are never so numerous as the corresponding 

 structures in Eunoa nodosa. 



