154 



BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



Locality. Plover Bay, East Siberia, 15 to 20 fathoms (William 

 H. Dall). 



Type. Cat. No. 16586, U.S.N.M. 



It is most unsatisfactory to establish new species upon single, 

 young specimens, but it seems to me much better to name, figure, and 

 describe them than to ignore them or to refer them to species to 

 which they almost certainly do not belong. This unique specimen, 

 which I have called psilopora, is like A. gymnopora Liitken and Mor- 

 tensen in the absence of tentacle scales and the presence of three arm 

 spines; but as there are four spines on some of the basal joints, and 

 as the disk scales, radial shields, outer oral papillae, and upper and 

 under arm plates are so different from the Panamic form, I am sure it 

 does not belong to that species. 



AMPHIODIA URTICA. 



Amphiura urtica LYMAN, Proc. Boston Soc. Nat. Hist., vol. 7, 1860, p. 195. 

 Amphiodia urtica VERRILL, Trans. Conn. Acad., vol. 10, 1899, p. 313. 



Localities. Albatross station 3131, off California, lat. 36 41' 30" 

 N.; long. 121 54' 10" W., 48 fathoms, brown mud, rocks, bottom 



FIG. 64. AMPHIODIA URTICA. X 6. 



a, FROM ABOVE; 6, FROM BELOW; c, SIDE VIEW OF THREE ARM 



JOINTS NEAR DISK. 



temperature 50.8, 91 specimens; station 3148, off California, lat. 

 37 8' N.; long. 122 28' 10" W., 47 fathoms, brown mud, bottom 

 temperature 51.3, 1 specimen; station 3165, off California, lat. 

 37 59' 45" N.; long. 123 8' 35" W., SOfathoms, green mud, bottom 

 temperature 49, 29 specimens; Sanborn Harbor, Alaska, 50 speci- 

 mens; Sitka, 15 fathoms, mud, 3 specimens; Puget Sound, 3 speci- 

 mens (Lyman's originals); Loc. ?, 1 specimen. Bathymetrical range, 

 15 to 50 fathoms. Temperature range 51.3 to 49. One hundred 

 and seventy-eight specimens. 



As this very interesting species has never been figured, it seems to 

 be worth while to give some illustrations showing the essential char 

 acters. The specimens before me range in disk diameter from 2 to 9 

 mm., so that it is evident the species is of small size, though the arms 

 are exceedingly long, and slender. 



