278 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



pedicels. Tentacles are supported by oval or elongated, knobbed 

 plates up to 0.5 mm. in length. Radial segments of calcareous ring 

 without posterior prolongations, with the anterior margin divided 

 into unequal halves. Eetractors inserted to the body wall less than 

 one-third of the body length, from the anterior end. Polian vesicle 

 and stone-canal single. Genital tubes dichotomously branched near 

 the base, forming 2 tufts. Respiratory trees 2, with pinnate branches. 



Orcula luminosa Lampert is very close to the present species, only 

 differing in the smaller number of large, plump tables in the perisome 

 and the absence of tables from the pedicels. 



Habitat. — Aleutian Islands. 



Type.— Cat. No. 34180, U.S.N.M. 



82. PHYLLOPHORUS DIOMEDE-E, new species. 

 Plate 11, figs. 30a, 6. 



Station 4994. Three specimens. 

 Station 5046 or 5047. One specimen. 



Body fusiform, gradually tapering posteriorly, 36.5 mm. long, 9 mm. 

 across. Integument soft, rough to the touch, white to yellowish- 

 brown in color. Tentacles gray in color, 15 in number, of which 10 

 are large and interradial in position, while the other 5 are very minute 

 and lie one in each radius. Pedicels small and short, forming a double 

 row in each ambulacrum, and irregularly scattered in all interambul- 

 acral spaces. Deposits of general perisome are tables (pi. 11, figs. 

 30a, h) ; disk nearly quadrangular, with wavy margin, a large central 

 hole and 4-20 peripheral ones. Diameter of disks 83-1 60/*, with a 

 mean of about 105/1. Spire, 50-80/i high, made up of 4 pillars, con- 

 nected twice by crossbeams and ending with numerous, minute teeth. 

 Tables in the introvert are very irregular, with serrated margin and 

 numerous holes, equal in size to those of general perisome; spire is 

 often totally absent, or very rarely composed of 5 pillars. Pedicels 

 have tables like those in perisome and an end plate measuring 11 0-300/* 

 in diameter. Anus surrounded by 5 teeth and 10 papillae. Support- 

 ing rods of tentacles usually widened at the middle, without knobs and 

 perforated by a few holes. Each radial segment of calcareous ring is 

 divided at its anterior margin into 2 unequal halves. Retractors 

 inserted less than one-fourth of the body length from the anterior end. 

 One or two Polian vesicles, one stone-canal. Respiratory trees 2, 

 opening at the anterior end of the long cloaca. 



The species resembles my Ph. cylindricus, but differs in the general 

 shape of its body and in the shape and size of its tables. These are 

 similar to those of Orcula tenera Ludwig, but they seem to be very 

 sparse in that species and moreover the calcareous ring has long pos- 

 terior prolongations. 



Habitat. — Off Rebun Island, Hokkaido; off Ojika Peninsula. 



Type.— Oat. No. 34181, U.S.N.M. 



