NO. 2 HARTMAN., BARNARD: BENTHIC FAUNA OF DEEP BASINS 77 



The chitinous tubes measure 15 to 20-28 mm long, are straight or 

 somewhat curved. Most retain the pedal disk and are distally frayed 

 (Plate 1, fig. 1). The tubes range in color from light yellow (when 

 thin) to dark brown. None of the tubes have been found to contain 

 anything but mud and the tests of foraminifers. 



Stephanoscyphus simplex has a geographic range extending to all 

 oceans, and a vertical range of more than 3000 fms. It is found in hadal 

 and bathyal depth zones, occurring at temperatures of about 4°C. 

 (Kramp, 1959). 



ECHIUROIDEA 



Two specimens, representing 2 species in different genera, have been 

 taken in Long and San Nicolas Basins. The larger is an entire specimen 

 and is referred to the genus Prometor Fisher (below). The smaller one 

 is fragmented and has not been generically assigned ; it may be character- 

 ized by having a very broad, laterally frilled proboscis. 



Genus PROMETOR Fisher, 1947 



This is characterized as follows: The proboscis is long, ribbonlike, 



and has a specialized cup or funnel at its base. A pair of anterior neph- 



ridia opens to the exterior by a single median pore. The nephrostome 



is large, compressed, fan-shaped, and bilabiate, and leads to the exterior 



through a single pore. Two well developed setae are located at the 



anterior end; they are set close together. A pair of unbranched anal 



vesicles is located in front of the posterior anal aperture, each with 



many glandular tubules. The genus and species are known only through 



a female; the male may be a dwarf, as is characteristic of the family 



Bonellidae. 



Prometor poculum, new species 

 (Plate 2, figs. 1-4) 



A single large specimen was taken in Long Basin (Sta. 6351). The 

 body is shaped like a cucumber and measures 95 mm long without the 

 proboscis, which is as long again (Plate 2, fig. 1). The proboscis is 

 slender at the base and widens distally into a broad, triangular lobe. 

 The cup-shaped base is pierced centrally by the oral opening. The epi- 

 thelium of the anterior half of the body is glandular and papillated; 

 its posterior half is abruptly smoother and thinner. The anal pore, on the 



