264 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 48. 



6 mm. Color white, introvert and tentacles tinged with brown; 

 integument stiff, rough to the touch. Tentacles 10, midventral pair 

 being smaller than the others. Pedicels nonretractile, confined to 

 ambulacra, along each of which they form a double row, of about 60 

 pedicels in bivium, and 70 in trivium. Table like deposits (pi. 10, 

 figs. 22a, b) are very abundant in general perisome. Disk is elongated, 

 with 3-10 holes and wavy margin, 73-240/* in diameter. Those lying 

 externally measure 160/* in average diameter, being smaller than 

 those of the inner, which are about 200/* on an average. Spire, 50- 

 60/t high, consisting of two pillars united by a crossbeam, and armed 

 with 6-8 teeth at the top. There are found between these bodies 

 larger smooth plates without spire. In the introvert are scattered 

 very delicate tables with oval disk and zigzag margin, 60-240/* in 

 diameter, with 10-40 holes and a spire 12/* high. No anal teeth are 

 found. Pedicels are supported with bent, modified tables with nar- 

 rowed disk, measuring 120-190/* long, with 4 holes at the middle and 

 1-3 holes at each end. Spire about 33/* high, consisting of two pillars 

 united at the top, armed with three teeth. Supporting rods of tenta- 

 cles are very irregular and spinous. End plate well developed, 260/* 

 in diameter, often wheel-like as in Thy one venusta Selenka. 1 Cal- 

 careous ring massive, with long posterior radial prolongations. 



Polian vesicle single; stone-canal also single, with a large, kidney- 

 shaped madreporite. Respiratory trees two, genital tubes un- 

 branched. 



From C. perdita Koehler and Vaney the present species differs only 

 in the absence of pedicels from the interambulacra. This species also 

 resembles C. cdlcigera in shape of tables, calcareous ring, and madre- 

 porite. But the considerable size of end plate, shape of tables in the 

 introvert, absence of the deeper layer of elongated plates, etc., dis- 

 tinguish it from all others. 



Habitat — Genkai Sea, north of Kyushu; off Goto Islands, west of 

 Kyushu. 



Type.— Cat. No. 34169, U.S.N.M. 



64. CUCUMARIA, species (juv.). 



Station 5087. Four specimens. 

 Body cylindrical, with truncate anterior and dorsally curved pos- 

 terior end. The largest specimen is only 11.5 mm. long and 5.5 mm. 

 in diameter. Color brownish- white, integument stiff and rough. 

 Tentacles 10, 2 ventral markedly smaller tha,n the others. Pedicels 

 not retracted, arranged in a single row in each ambulacrum, very few 

 in bivium. Deposits in the form of smooth, elliptic plates with wavy 

 margin and slightly spinous ends, 170-320/* in length, with 4-17 holes. 

 Introvert, tentacles, and pedicels with rods which are often branched, 



i See Selenka, Nachtrag, 1868, pi. 8, fig. 12. 



