10 AMERICAN MUSEUM NOVITATES [No. 74 



dorsally near the margin of the plate, and has a dorsal and ventral lip, the latter the 

 larger and with radiating lines. 



Uncini (Fig. 8) appear on the second setigerous somite, only slender setae appear- 

 ing on the first. The rows of uncini are at first short but soon lengthen. Each uncinus 

 has a long, gently curved shaft, of which I have figured only the terminal portion. 

 At the apex is a single tooth with a much larger one ventral to it. Dorsal to the 

 apical tooth are a series of fine denticulations, hardly large enough to be called teeth, 

 which extend laterally around the end of the uncinus. Ventral to the larger tooth are a 

 series of fine hair-like processes. In the tuft dorsal to the uncinus-row are two kinds 

 of setae. One has rather heavy brown-colored bases, which are bilimbate just outside 

 the body wall but distally to this narrow into an extremely long delicate white apical 

 portion with two marginal rows of minute denticulations. The second kind are 

 smaller and not so dark in color as the first; they widen slightly toward the end and 

 narrow abruptly asymmetrically to form a long, slender, needle-like apex which forms 

 an angle with the main axis of the seta. 



Station D.5698; 475 fathoms; bottom temp., F. 39.9°. 



Terebellidae 



Terebella robusta (Johnson) 

 Amphitrite robusta Johnson, 1901, pp. 425-426, PL xvi, figs. 164-168. 

 Station D.5698; 475 fathoms; bottom temp., F. 39.9°. One 

 specimen. 



Thelepus crispus Johnson 

 Thelepus crispus Johnson, 1901, p. 428, PL xvn, figs. 175-1786. 

 One imperfectly preserved and evidently immature individual. In 

 form of gills, sette, and uncini this agrees with Johnson's description, but 

 it does not show the eye spots which Moore describes in the young 

 individuals. 



Station D.5693; 451 fathoms. 



