440 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



iier, the ultimate brauchlets being small and not very numerous. The 

 second and third pairs of brauchise are similar in form, but have fewer 

 branches, all of which arise from the posterior side of the stem. Capil- 

 lary setae commence on the third brauchiferous segment, but a pair of 

 small papillae corresponding to the upper parapodia occur on the sec- 

 ond brauchiferous segment ; they continue on seventeen segments. The 

 tori commence on the second brauchiferous segment, but distinct rows 

 of uucini first occur in those of the first segment behind the branchiae. 

 The unciui are in long rows and have a rather narrow, somewhat cres- 

 cent-shaped base, with three terminal hooks, of which the innermost is 

 much the largest, long, sharp, rather narrow, somewhat incurved, while 

 the outermost is very small and acute, closely pressed against the base 

 of the intermediate one. 



Color, when fresh, dark red or reddish brown. 



Length of the body usually from GO to 75'"™. Some are larger. Sta- 

 tion 874, in 85 fathoms, 1880, and in many other stations in subsequent 

 seasons, in 50 to 130 fathoms. 



Sabella picta Verrill, sp. no v. 



Verrill, Trans. Conn. Acad., vol. iv, pi. 20, figs. 5, 5a, 5&; pi. 21, fig. 7. 

 Verrill, Report U. S. Fish Com. for 1883, pi. 42, figs. 188, 188a, 1885. 



Body elongated, moderately stout, 50 to 60""™ in length, with a well- 

 marked ventral groove on the eight anterior segments. Collar well-de- 

 veloped, with a plain, somewhat revolute margin, emarginate beneath; 

 posterior end abruptly tapered, with numerous short segments, the 

 last simple. Branchiae numerous, long, slender, forming a beautiful 

 wreath in expansion, united nearly half their length by a web, with a 

 small, spatulate, naked tip. Cirri numerous, close, long, slender, long- 

 est on the distal half; ocelli none. The spatulate setae are rather stout, 

 with the tips considerably expanded and bluntly rounded. The unci- 

 nate setae are somewhat recurved, a little swollen distally, with the tips 

 strongly bent and beak-shaped, and with about four small denticles at 

 the curvature. Caudal segment acute-conical. Color of the body green- 

 ish, specked with bright red, most so posteriorly and anteriorly, on the 

 collar the red predominates. Branchiae transparent greenish white, 

 with transverse spots of flake- white and bright red ; bases light red. 



Off Martha's Vineyard in 30 to 120 fathoms ; off Point Judith, R. L, 

 at station 784, in 20 fathoms, 1880. 



ECHINODEEMATA. 



Synapta brychia Verrill, sp. nov. 



Verrill, Report U. S. Fish Com. for 1883, p. 37, 1885, 

 A large species, with a strong, thick, opaque purplish brown skin, as 

 preserved in alcohol. The strong longitudinal muscles are lighter 

 colored. The skin contains rather large, scattered, ovate plates, easily 



