EEPOET ON THE ANNELIDA. 
295 
longer. In those with the tentacular cirri best developed, the tips extend a little 
beyond the anterior margin of the buccal segment. There is an evident projection below 
the lateral notch of the buccal somite, and the inferior division forms a distinct external 
flap at its commencement. 
The dental apparatus is dark brown. The maxillse (Fig. 54) have a thickened external 
rim anteriorly. In regard to the number of the teeth on the various processes this species 
shows that there is a certain amount of variation. Thus the great dental plates have 
each four, five, or six teeth of comparatively large size. The left lateral paired plate 
possesses five or six teeth, the left unpaired five or seven. The right lateral plate bears 
from eight to ten teeth. The inferior dental surface of the mandibles (Fig. 55) presents a 
Fig. 54. — Maxillae and dental plates of Eunice pycnobranchiata, n. sp. ; x 12 diameters. 
Fig. 55. — Mandibles of tbe same form viewed respectively from the ventral and dorsal surfaces ; x 12 diameters. 
distinct tooth on each side of the suture or hinge, and the anterior or cutting edge has 
several irregular denticulations. 
The branchiae commence on the fifth foot on each side as a single process (in the 
largest example it is double). There are four somewhat short, thick divisions on the tenth 
foot (PL XXXIX. fig. 14). The branchial lobes have an elongated, fusiform aspect, and 
are marked by transverse bars, probably from the arrangement of the blood-vessels. The 
twentieth foot has three branchial divisions, and the same number is found on the 
thirtieth. There are two divisions on the fiftieth ; and, indeed, the organs are con- 
tinued almost to the tail, though they are single and much shorter than those in front. 
In young specimens considerable divergence in the form or structure of the branchiae 
occurs, and the divisions are less numerous. 
Each foot bears anteriorly two blackish-brown spines ; and between the twentieth 
