1904.] NATURAL SCIENCES OF PHILADELPHIA. 171 



terminal or slightly ventral anus occupies a notch. A thickened 

 dorsal shield plate, of a pink color and elongated elliptical form, occu- 

 pies about 26 somites. There are in all 7 setigerous thoracic and about 

 100 abdominal somites, though the number could not be 'accurately 

 determined, owing to an injury to the only complete specimen. 



The thoracic setse present the same general features as in V. pluri- 

 annulata, but are throughout more slender, delicate and acute, and 

 have narrower wings; the number of nearly or quite wingless ones is 

 also greater. Throughout the greater part of the abdominal region 

 l3ut two setsB (fig. 23) occur in each bundle. These are delicate, 

 colorless and of the same type as in V. pluriannulata, but have 

 narrower, less angulated and less curved blades, which in the case of 

 one is almost perfectly straight. 



The arrangement and form of the thoracic uncini (fig. 24) is also 

 A^ery close in the two species, the chief difference being that in this the 

 teeth are usually 15 in number and exhibit a more exact alignment 

 with the basal plate. Very often a minute tooth occurs on the basal 

 plate just below the large truncate tooth, and the overlapping of the 

 latter by the preceding tooth is often very marked. Abdominal 

 "uncini (fig. 25) differ still less, but the number of acute teeth is 11-13. 

 The caudal setae are all broken short off. 



Only a small piece of the tube is present. It is thicker than that of 

 Vermilia pluriannulata, measures 3 mm. in diameter at the mouth, 

 which is broken, and 2.5 mm. at the opposite end. The single flange 

 present extends only halfway around the tube on the free side, but is 

 very prominent and flaring. The surface of the tube is marked by 

 rough transverse lines of growth with a slightly spiral turn, and on 

 the flange section onl}^ by 5 rough longitudinal ribs. 



Suruga Bay, 3,707, 63-75 fms., 2 specimens with fragments of tubes. 



Vermilia pluriannulata sp. nov. (PL XII, figs. 26-32, 45; PL XI, fig. 19.) 



The single example from which this species is described measures: 

 Total length, 1 9 mm. ; branchiae, 4.5 mm. ; thorax, 3 mm., and diameter, 

 2.4 mm. The branchiae are in bad condition, but show 19 radioles on 

 each side, w^hich are shorter and have relatively longer and more slender 

 naked tips than in V. ctenophora. 



The operculum is developed from the left dorsal branchial radiole, 

 and the stalk and body each measure 2.5 mm. long. The former is 

 of nearly uniform diameter, very slightly depressed and marked with 

 numerous transverse wrinkles, as though in contraction. The body 

 (figs. 26, 27, 28) is broadly elliptical in face views, but in profile shows 

 a nearly parabolic ventral and a slightly convex dorsal outline. It is 



