ECHINOSOMA KCEHLERI. 167 



the apophysis fails to extend into it (fig. 13). The smaller tridentate 

 pedicellarias are not peculiar; the valves (PI. 67, figs. U, 18) are about .40 

 mm. long and closely in contact throughout, usually they are more or le.ss 

 pointed (fig. 18), but many of those on the specimens from 3784 are 

 rounded (fig. 14). Perhaps it ought to be emphasized that the tridentate 

 pedicellariae integrade with each other in form as well as in size, and the 

 specimens from 3784 have the ordinary forms as well as the more unusual 

 forms figured. 



The opkicephalous pedicellarioe resemble those of Sperosoma. The stalks 

 are very long, five or six times as long as the head, straight and rela- 

 tively stout. There is almost no neck. The valves (PI. 67, fig. 21) are 

 about .70 mm. long, strongly constricted near the middle and have large 

 articulating loops. 



This species was taken by the " Albatross " at the following stations, the 

 specimens ranging from 30 to 135 mm. in diameter. 



Station 3707 (?). Off Ose Zaki, Honshu Island, Japan. 63-75 fathoms. 

 Vol. s., a., g. 



Station 3784. North of Aleutian Islands; 54°32'N., 178° 31' E. 850 

 fathoms.^ Gn. m., fne. gy. s. 



Station 4928. In Colnett Strait, Japan ; 29° 51' N., 131° 2' 30'' E. Bott. 

 temp. 36.8°. 1008 fathoms. Gy. s., glob. 



Station 5084. Off Omai Saki Light, Japan; 34° N., 137° 49' 40" E. 

 Bott. temp. 36.8. 918 fathoms. Gn. m., fne. s., glob. 



Bathymetrical range, 63-1008 fathoms; probably 850-1008 fathoms is 

 correct. 



Eight specimens. 



Echinosoma Koehleri A. Ag. and CI. 



Tromikosoma Koehleri Mortensen, 1903. " Ingolf " Ech., I, p. 78; figs. 5, 6. 



Davis Strait, 1435 fathoms. 



In addition to the extraordinary width of the ambulacra, the abactinal 

 arrangement of the tube-feet is an interesting character of this species ; for 

 the inner series contains twice as many feet as the outer, just the reverse of 

 the condition found in tenue. 



* The depth as published in the " Albatross " Records is 8.5 fathoms. But on the label with these 

 specimens, it is distinctly " 850 fms." The " 85 " is doubtless a misprint. 



