REPORT ON THE ANNELIDA. 
315 
are somewhat longer than in the European form. The tentacular cirri are also longer 
and more slender. The two rounded prominences on the ventral surface of the snout 
are less elongated. No eyes are visible. The latter feature, not unusual in Annelids 
from great depths, is further qualified by the fact that the eyes of the common form 
are often pale. 
The dental apparatus (Fig. 72) is unusually dense, and more or less brownish accord- 
ing to age. Five blackish lines (running along the borders of adjoining parts) converge 
at the junction of the maxillse posteriorly, and there is a deep blackish band below each 
lateral paired plate. The maxillae and great plates are here and there marked with a 
superficial whitish deposit. The maxillae show a distinct constriction posteriorly, then 
Fig. 72. — MaxUlas and dental plate.s of Nothria ahranchiata, n. sp., from Station 335, separated posteriorly ; x 20 diameters. 
Fig. 73. — Ventral view of the mandibles of the same ; x 20 diameters. 
enlarge into flat plates and again diminish anteriorly, where the curve is moderate. 
The tip of each has a thick outer fold. A very marked angle occurs between the 
maxillae and the posterior appendages, which bend ^abruptly downward. Each append- 
age has a pale basal triangular piece and an outer broad brownish portion, somewhat 
undefined externally. The left great dental plate has a great anterior fang followed by 
six or seven smaller teeth, while the right shows ten or eleven. The left lateral pamed 
plate has eight, and an isolated accessory plate rises into a single prominent tooth. 
The unpaired plate of the same side presents ten or eleven teeth. The right lateral 
plate has about ten teeth. The dental portion of the mandibles (Fig. 73) usually pre- 
sents from the ventral aspect a somewhat lanceolate outline on each side, the outer 
anterior extremity being produced and pointed. The cutting edge shows a few denticles. 
