260 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



Six or seven pedicels are present in each ventral ambulacrum none 

 observed so far in the bivium. Deposits frequently present at the 

 posterior end of body and in pedicels, but very rare in other parts. 

 They are simple rods and may have both ends forked. The wall of 

 the stone-canal and its openings with quite a mass of simple rods. 

 The internal organs to be noted are: 10 segments of the calcareous 

 ring formed as a loose network; 5 longitudinal muscles with slender 

 retractors; a single Polian vesicle; a stone-canal inserted to body 

 wall; a pair of rudimentary genital organs attached to dorsal mesen- 

 tery; and the alimentary canal in the form of a somewhat drawn-out 

 spiral, with a pair of rudimentary respiratory trees at the beginning 

 of the cloaca. At the point where the stone-canal reaches the body 

 wall, the canal is dilated into a flat cavity extending posteriorly and 

 branched like roots, with external opening at each end. 



Of the known species of Cucumaria, C. abyssorum Theel perhaps 

 stands nearest to this species, but it lacks the brood pouches and the 

 deposits are very different. I take great pleasure in naming this 

 most interesting form for Prof. Isao Ijima, of the Science College, 

 Tokyo Imperial University. 



Habitat. — Aleutian Islands. 



Type.— Oat. No. 34165, U.S.N.M. 



60. CUCUMARIA LAMPERTI, new species. 

 Plate 10, figs. 19a-b. 



Station 4778. Four specimens. 



Station 4779. One specimen. 



Station 4784. Forty-six specimens and twenty-nine young 

 born after capture. 



Station 4786. One specimen. 



Station 4792. One specimen. 

 Body ovoid, 34 mm. long, and 14 mm. broad, with both ends turned 

 dorsad. Color white or tinged with light yellow, integument stiff and 

 rough to the touch from the presence of abundant deposits. Ten- 

 tacles 10, very short, midventral pair much smaller than the rest. 

 Pedicels confined to the ambulacra, in double rows in trivium, in one 

 case 44 in the midventral, 37 and 38 in each ventrolateral ambulacrum. 

 In younger specimens the ventrolateral ambulacra had only single 

 rows of pedicels. In the bivium they are generally reduced and 

 papilla-like, numbering 5 to 10 in each ambulacrum. But in some 

 individuals there is a complete double row of well-developed pedicels, 

 numbering 30 in each. Deposits in the form of thick, knobbed plates 

 of various sizes (pi. 10, Hg. 19a) are very abundant, especially in 

 ventral perisome. The small ones are smooth, button-shaped and 

 bear at one end some spines (fig. 19J), which become obscured in very 

 large ones. These plates lie imbricated, with the spinous end 



