THE SESSILE BAENACLES. 231 



The sheath is short, about half the length of the carina and sides, 

 one-fourth that of the rostrum, with fine horizontal ridges bearing 

 short fringes of golden bristles. Its lower edge is continuous with 

 the interior of the walls. The parietes are nearly smooth within, but 

 sometimes very weak ribs are visible. The basal edges of the com- 

 partments are smooth and beveled. The base of the rostrum is 

 broadly rounded, the upper end tapering a little. Sides nearly in 

 a plane. 



The labrum has three teeth and is minutely hairy on each side of 

 the deep notch (fig. 735). 



The mandible (fig. 73) has five teeth, the lower two small, 

 lower one united with the lower point. The maxilla (fig. 73c) has 

 a slight notch below the upper pair of spines. There are seven 

 spines below the upper pair, the lower two slightly larger. 



FIG. 73. BALANDS DECLIVI^ a, MANDIBLE, b, LABRUM. c, MAXILLA. 



The first cirrus has rami of 25 and 9 segments, the posterior ramus 

 about one-third as long as the anterior. The segments do not pro- 

 trude. Both rami are very slender. 



The second cirrus has slightly unequal rami of 13 and 10 seg- 

 ments. The third is somewhat longer, with rami of 18 and 15 seg- 

 ments, the outer slightly longer. There are a few minute spinules 

 near the distal borders of some segments. In the remaining cirri the 

 first joint of the pedicel is very long. Cirrus iv has unequal rami of 

 18 and 21 segments, the outer ramus shorter, with protuberant seg- 

 ments (fig. 74). Both segments of the pedicel have series of 

 small, erect spinules at the distal anterior angles (fig. 71&). The 

 lower segments of the outer ramus have a short distal series of 

 erect teeth, and an anterior series of large recurved teeth. The latter 

 appear on the lower 12 segments, but the teeth become fewer above 

 (fig. 7!<7, d). The inner ramus has three pairs of spines on the 

 segments. The sixth cirrus has rami of 36 segments, bearing three 

 pairs of spines, some median segments with a very minute fourth 

 pair (fig. 74:e). 



The penis is nearly as long as the sixth cirrus, with a few short 

 hairs near the distal end. Near the proximal end there is a minute 

 point on the dorsal side. 



