EEPOET ON THE ANNELIDA. 
ooo 
oZo 
Tlie liead (PL XLI. fig. 7 ) lias the typical form. Tlie median and lateral tentacles 
are of considerable length, and tinted of a pale buff colour. 
The dental apparatus (Fig. 79) is madder-brown, with darker touches. In general 
outline it approaches that of the Eunicidse rather than the series just considered, since 
the posterior appendages are nearly in the same plane as the maxillse. The latter present 
a broad posterior half, without the evident basal constriction of the previous species. 
The anterior region is strong!}:" curved, and gradually narrowed to the tip. The 
spathulate appendages form a symmetrical lobate region with a median notch posteriorly. 
The part near the maxillse, corresponding to the base of the triangles, is constricted, 
then a somewhat ovate lamella expands on each side. The left great dental plate does 
Fig. 79. — Maxillae and dental plates of Nothria willemoesii, n. sp. The right and left lateral paired plates are in different 
positions ; x 24 diameters. 
Fig. 80. — Ventral view of the mandibles of the same form ; x 24 diameters. 
not present the long anterior fang so characteristic of the previous series, but ten teeth 
follow each other in an even row ; the right also has ten. The left lateral paired plate 
possesses eleven teeth ; the left unpaired nine. The right lateral plate shows about 
twelve. Two accessory plates occur on each side, the smaller inner one having a 
prominent tooth, while the outer forms a larger thin plate. The paired lateral plates 
have each a dark brownish band along the ventral alveolus. The mandibular shafts 
(Fig. 80) are short and broad. The outline of the ventral dental area is somewhat 
ovoid, the outer margin, however, being truncated. The halves approach each othei- 
closely. 
